diff --git a/Calculator.java b/Calculator.java
new file mode 100644
index 0000000000000000000000000000000000000000..b9d2fc2dfcbcf526cfa7d5cac41e8d1f70a0c53e
--- /dev/null
+++ b/Calculator.java
@@ -0,0 +1,136 @@
+package java2020spring;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.lang.reflect.Array;
+import java.awt.BorderLayout;
+import java.awt.Color;
+import java.awt.GridLayout;
+import javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+
+public class Calculator extends JFrame implements ActionListener{
+	private static final long serialVersionUID = 1L;
+		private static final String COMMANDS = null;
+		private static final Icon[] COMMAND = null;
+		private static final String M = null;
+		
+	public static void main(String[] args) {
+		Calculator calculator=new Calculator();
+		calculator.setVisible(true);
+	}
+	
+	public Calculator() throws HeadlessException  {
+		super("Caculator");
+    	resultText.setAlignmentX(RIGHT_ALIGNMENT);
+    this.setTitle(Const.TITLE);
+	this.setSize(Const.FRAME_W,Const.FRAME_H);
+	this.setLayout(new BorderLayout());
+	this.setLocation(Const.FRAME_X,Const.FRAME_Y);
+	this.setResizable(false);
+	this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+	resultText.setBounds(20,18,255,115);
+	resultText.setAlignmentX(RIGHT_ALIGNMENT);
+	resultText.setEditable(false);
+	History.setBounds(290,40,250,370);
+	History.setAlignmentX(LEFT_ALIGNMENT);
+	History.setEditable(false);
+	label.setBounds(400,15,100,20);
+	j1.setBounds(20,18,320,115);
+	j1.setLayout(new GridLayout());
+	j2.setBounds(380,40,250,380);
+	j2.setLayout(new GridLayout());
+	resultText.setLineWrap(true);
+	resultText.setWrapStyleWord(true);
+	History.setLineWrap(true);
+	History.setWrapStyleWord(true);
+	g1.setViewportView(resultText);
+	g1.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
+	g2.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
+	g2.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
+	g2.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
+	j1.add(g1);
+	j2.add(g2);
+	this.add(j1);
+	this.add(j2);
+	this.setLayout(null);
+	this.add(label);
+	int x=20,y=150;
+	 for (int i=0;i<KEYS.length;i++)
+	 {
+	     keys[i]=new JButton();
+	     keys[i].setText(KEYS[i]);
+	     keys[i].setBounds(x,y,60,40);
+	     if(x<250) {
+	  x+=65;
+	     } 
+	     else {
+	  x=20;
+	  y+=45;
+	     }
+	     this.add(keys[i]);
+	 }
+	 for (int i=0;i<KEYS.length;i++)
+	 {
+	     keys[i].addActionListener(this);
+	 }
+	 this.setResizable(false);
+	 this.setBounds(500,200,670,480);
+	 this.setDefaultCloseOperation(EXIT_ON_CLOSE);
+	 this.setVisible(true);
+	    }
+	
+	public void init() {
+		resultText.setBackground(Color.WHITE);
+		JPanel calckeysPanel=new JPanel();
+	    resultText.setBackground(Color.WHITE);
+	    calckeysPanel.setLayout(new GridLayout(5,5,3,3));
+	    for(int i=0;i<keys.length;i++) {
+	    	keys[i]=new JButton(KEYS[i]);
+	    	calckeysPanel.add(keys[i]);
+	    	keys[i].setForeground(Color.BLACK);
+	    	keys[i].addActionListener(this);
+	    	this.setBackground(Color.LIGHT_GRAY);
+	    	this.pack();
+	    }
+	   
+	    }
+	    
+
+	public String getA() {
+		return a;
+	}
+
+
+	public void setA(String a) {
+		this.a = a;
+	}
+	private String[] KEYS= {"7","8","9","+","sqrt","4","5","6","-","%","1","2","3",
+			"*","1/x","+/-","0","=","/",".","(",")","e","x*x","Bac","C","MC",
+			"MR","MS","M+"};
+	private JButton keys[]=new JButton[KEYS.length];
+	private JTextArea resultText=new JTextArea("0");
+	private JTextArea History=new JTextArea();
+	private JPanel j1=new JPanel();
+	private JPanel j2=new JPanel();
+	private JScrollPane g1=new JScrollPane(resultText);
+	private JScrollPane g2=new JScrollPane(History);
+	private JLabel label=new JLabel("历史记录");
+	private String a="";
+	private JButton[] commands2;
+	private Array[] ms;
+	private JButton[] ms2;
+
+	@Override
+	public void actionPerformed(ActionEvent e) {
+		// TODO 自动生成的方法存根
+		
+	}
+}
+
+
+
+
diff --git "a/\350\256\241\347\256\227\345\231\250\347\254\254\344\270\200\346\254\241\346\217\220\344\272\244/Calculator.java" "b/\350\256\241\347\256\227\345\231\250\347\254\254\344\270\200\346\254\241\346\217\220\344\272\244/Calculator.java"
new file mode 100644
index 0000000000000000000000000000000000000000..436812a923d64725ccc7e37c263e43e3cdc1c2fb
--- /dev/null
+++ "b/\350\256\241\347\256\227\345\231\250\347\254\254\344\270\200\346\254\241\346\217\220\344\272\244/Calculator.java"
@@ -0,0 +1,23 @@
+package java2020spring;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+
+public class Calculator extends JFrame {
+
+	public Calculator() throws HeadlessException  {
+	    this.setTitle(Const.TITLE);
+		this.setSize(Const.FRAME_W,Const.FRAME_H);
+		this.setLayout(new BorderLayout());
+		this.setLocation(Const.FRAME_X,Const.FRAME_Y);
+		this.setResizable(false);
+		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+	}
+	
+	public static void main(String[] args) {
+		Calculator calculator=new Calculator();
+		calculator.setVisible(true);
+	}
+}
diff --git "a/\350\256\241\347\256\227\345\231\250\347\254\254\344\270\200\346\254\241\346\217\220\344\272\244/Const.java" "b/\350\256\241\347\256\227\345\231\250\347\254\254\344\270\200\346\254\241\346\217\220\344\272\244/Const.java"
new file mode 100644
index 0000000000000000000000000000000000000000..32cb2830d6ffee4d39fad8d14fd7a6fdbfdc0cf4
--- /dev/null
+++ "b/\350\256\241\347\256\227\345\231\250\347\254\254\344\270\200\346\254\241\346\217\220\344\272\244/Const.java"
@@ -0,0 +1,14 @@
+package java2020spring;
+
+import java.awt.*;
+
+public class Const {
+	public static final int FRAME_W=300;
+	public static final int FRAME_H=300;
+	public static final int SCREEN_W=Toolkit.getDefaultToolkit().getScreenSize().width;
+	public static final int SCREEN_H=Toolkit.getDefaultToolkit().getScreenSize().height;
+	public static final int FRAME_X=(SCREEN_W-FRAME_W)/2;
+	public static final int FRAME_Y=(SCREEN_H-FRAME_H)/2;
+	public static final String TITLE="计算器";
+	
+}
diff --git "a/\350\256\241\347\256\227\345\231\250\347\254\254\344\270\200\346\254\241\346\217\220\344\272\244/resultText.java" "b/\350\256\241\347\256\227\345\231\250\347\254\254\344\270\200\346\254\241\346\217\220\344\272\244/resultText.java"
new file mode 100644
index 0000000000000000000000000000000000000000..9a0cb4fa92f95953971677602c6761c238598de4
--- /dev/null
+++ "b/\350\256\241\347\256\227\345\231\250\347\254\254\344\270\200\346\254\241\346\217\220\344\272\244/resultText.java"
@@ -0,0 +1,17 @@
+package java2020spring;
+
+import java.awt.Color;
+
+public class resultText {
+
+	public static void setHorizontalAlignment(int right) {
+		// TODO 自动生成的方法存根
+		
+	}
+
+	public static void setBackground(Color white) {
+		// TODO 自动生成的方法存根
+		
+	}
+
+}
diff --git "a/\350\256\241\347\256\227\345\231\250\347\254\254\344\270\211\346\254\241\346\217\220\344\272\244" "b/\350\256\241\347\256\227\345\231\250\347\254\254\344\270\211\346\254\241\346\217\220\344\272\244"
new file mode 100644
index 0000000000000000000000000000000000000000..5ae430884de0b0ba8a5e631440bf24951dfdcb4f
--- /dev/null
+++ "b/\350\256\241\347\256\227\345\231\250\347\254\254\344\270\211\346\254\241\346\217\220\344\272\244"
@@ -0,0 +1,204 @@
+package java2020spring;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.lang.reflect.Array;
+import java.awt.BorderLayout;
+import java.awt.Color;
+import java.awt.GridLayout;
+import javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+
+public class Calculator extends JFrame implements ActionListener{
+	private static final long serialVersionUID = 1L;
+		private static final String COMMANDS = null;
+		private static final Icon[] COMMAND = null;
+		private static final String M = null;
+		
+	public static void main(String[] args) {
+		Calculator calculator=new Calculator();
+		calculator.setVisible(true);
+	}
+	
+	public Calculator() throws HeadlessException  {
+		super("Caculator");
+    	resultText.setAlignmentX(RIGHT_ALIGNMENT);
+    this.setTitle(Const.TITLE);
+	this.setSize(Const.FRAME_W,Const.FRAME_H);
+	this.setLayout(new BorderLayout());
+	this.setLocation(Const.FRAME_X,Const.FRAME_Y);
+	this.setResizable(false);
+	this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+	resultText.setBounds(20,18,255,115);
+	resultText.setAlignmentX(RIGHT_ALIGNMENT);
+	resultText.setEditable(false);
+	History.setBounds(290,40,250,370);
+	History.setAlignmentX(LEFT_ALIGNMENT);
+	History.setEditable(false);
+	label.setBounds(400,15,100,20);
+	j1.setBounds(20,18,320,115);
+	j1.setLayout(new GridLayout());
+	j2.setBounds(380,40,250,380);
+	j2.setLayout(new GridLayout());
+	resultText.setLineWrap(true);
+	resultText.setWrapStyleWord(true);
+	History.setLineWrap(true);
+	History.setWrapStyleWord(true);
+	g1.setViewportView(resultText);
+	g1.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
+	g2.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
+	g2.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
+	g2.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
+	j1.add(g1);
+	j2.add(g2);
+	this.add(j1);
+	this.add(j2);
+	this.setLayout(null);
+	this.add(label);
+	int x=20,y=150;
+	 for (int i=0;i<KEYS.length;i++)
+	 {
+	     keys[i]=new JButton();
+	     keys[i].setText(KEYS[i]);
+	     keys[i].setBounds(x,y,60,40);
+	     if(x<250) {
+	  x+=65;
+	     } 
+	     else {
+	  x=20;
+	  y+=45;
+	     }
+	     this.add(keys[i]);
+	 }
+	 for (int i=0;i<KEYS.length;i++)
+	 {
+	     keys[i].addActionListener(this);
+	 }
+	 this.setResizable(false);
+	 this.setBounds(500,200,670,480);
+	 this.setDefaultCloseOperation(EXIT_ON_CLOSE);
+	 this.setVisible(true);
+	    }
+	
+	public void init() {
+		resultText.setBackground(Color.WHITE);
+		JPanel calckeysPanel=new JPanel();
+	    resultText.setBackground(Color.WHITE);
+	    calckeysPanel.setLayout(new GridLayout(5,5,3,3));
+	    for(int i=0;i<keys.length;i++) {
+	    	keys[i]=new JButton(KEYS[i]);
+	    	calckeysPanel.add(keys[i]);
+	    	keys[i].setForeground(Color.BLACK);
+	    	keys[i].addActionListener(this);
+	    	this.setBackground(Color.LIGHT_GRAY);
+	    	this.pack();
+	    }
+	   
+	    }
+	    
+
+	public String getA() {
+		return a;
+	}
+
+
+	public void setA(String a) {
+		this.a = a;
+	}
+	private String[] KEYS= {"7","8","9","+","sqrt","4","5","6","-","%","1","2","3",
+			"*","1/x","+/-","0","=","/",".","(",")","e","x*x","Bac","C","MC",
+			"MR","MS","M+"};
+	private JButton keys[]=new JButton[KEYS.length];
+	private JTextArea resultText=new JTextArea("0");
+	private JTextArea History=new JTextArea();
+	private JPanel j1=new JPanel();
+	private JPanel j2=new JPanel();
+	private JScrollPane g1=new JScrollPane(resultText);
+	private JScrollPane g2=new JScrollPane(History);
+	private JLabel label=new JLabel("鍘嗗彶璁板綍");
+	private String a="";
+	private JButton[] commands2;
+	private Array[] ms;
+	private JButton[] ms2;
+
+	public void actionPerformed(ActionEvent e) {
+			String label=e.getActionCommand();
+			if(label=="=")
+			{
+				resultText.setText(this.a);
+				History.setText(History.getText()+resultText.getText());
+				if(label=="=")
+				{
+					String s[]=houzhui(this.a);
+					String result=Result(s);
+					this.a=result+"";
+					resultText.setText(this.a);
+					History.setText(History.getText()+"="+resultText.getText()+"\n");
+				}
+			}
+			else if(label=="AC")
+			{
+				this.a="";
+				resultText.setText("0");
+			}
+			else if(label=="sqrt")
+			{
+				String n=k(this.a);
+				resultText.setText("sqqrt"+"("+this.a+")"+"="+n);
+				History.setText(History.getText()+"sqrt"+"("+this.a+")"+"=");
+				this.a=n;
+			}
+			else if(label=="x*x")
+			{
+				String m=p(this.a);
+				resultText.setText(this.a+"^2"+"="+m);
+				History.setText(History.getText()+this.a+"^2"+"=");
+				this.a=m;
+			}
+			else if(label=="e"||label=="pi")
+			{
+				if(label=="e")
+				{
+					String m=String.valueOf(2.7182818);
+					this.a=this.a+m;
+					resultText.setText(this.a);
+				}
+				if(label=="pi")
+				{
+					String m=String.valueOf(3.1415926);
+					this.a=this.a+m;
+					resultText.setText(this.a);
+				}
+			}
+			else
+			{
+				this.a=this.a+label;
+				resultText.setText(this.a);
+			}
+	}
+	
+
+	private String p(String a2) {
+		// TODO 鑷姩鐢熸垚鐨勬柟娉曞瓨鏍�
+		return null;
+	}
+
+	private String k(String a2) {
+		// TODO 鑷姩鐢熸垚鐨勬柟娉曞瓨鏍�
+		return null;
+	}
+
+	private String Result(String[] s) {
+		// TODO 鑷姩鐢熸垚鐨勬柟娉曞瓨鏍�
+		return null;
+	}
+
+	private String[] houzhui(String a2) {
+		// TODO 鑷姩鐢熸垚鐨勬柟娉曞瓨鏍�
+		return null;
+	}
+}
+
diff --git "a/\350\256\241\347\256\227\345\231\250\347\254\254\344\272\224\346\254\241\346\217\220\344\272\244" "b/\350\256\241\347\256\227\345\231\250\347\254\254\344\272\224\346\254\241\346\217\220\344\272\244"
new file mode 100644
index 0000000000000000000000000000000000000000..af3d3d92292344362812072f24c7944587bc3162
--- /dev/null
+++ "b/\350\256\241\347\256\227\345\231\250\347\254\254\344\272\224\346\254\241\346\217\220\344\272\244"
@@ -0,0 +1,481 @@
+package calculator;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.lang.reflect.Array;
+import java.math.BigDecimal;
+import java.awt.BorderLayout;
+import java.awt.Color;
+import java.awt.GridLayout;
+import javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+
+import java2020spring.Const;
+
+import java.util.Scanner;
+
+public class Calculator extends JFrame implements ActionListener{
+	private static final long serialVersionUID = 1L;
+		private static final String COMMANDS = null;
+		private static final Icon[] COMMAND = null;
+		private static final String M = null;
+	public static void main(String[] args) {
+		Calculator calculator=new Calculator();
+		calculator.setVisible(true);
+	}
+	
+	public Calculator() throws HeadlessException  {
+		super("Caculator");
+    	resultText.setAlignmentX(RIGHT_ALIGNMENT);
+    this.setTitle(Const.TITLE);
+	this.setSize(Const.FRAME_W,Const.FRAME_H);
+	this.setLayout(new BorderLayout());
+	this.setLocation(Const.FRAME_X,Const.FRAME_Y);
+	this.setResizable(false);
+	this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+	resultText.setBounds(20,18,255,115);
+	resultText.setAlignmentX(RIGHT_ALIGNMENT);
+	resultText.setEditable(false);
+	History.setBounds(290,40,250,370);
+	History.setAlignmentX(LEFT_ALIGNMENT);
+	History.setEditable(false);
+	label.setBounds(400,15,100,20);
+	j1.setBounds(20,18,320,115);
+	j1.setLayout(new GridLayout());
+	j2.setBounds(380,40,250,380);
+	j2.setLayout(new GridLayout());
+	resultText.setLineWrap(true);
+	resultText.setWrapStyleWord(true);
+	History.setLineWrap(true);
+	History.setWrapStyleWord(true);
+	g1.setViewportView(resultText);
+	g1.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
+	g2.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
+	g2.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
+	g2.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
+	j1.add(g1);
+	j2.add(g2);
+	this.add(j1);
+	this.add(j2);
+	this.setLayout(null);
+	this.add(label);
+	int x=20,y=150;
+	 for (int i=0;i<KEYS.length;i++)
+	 {
+	     keys[i]=new JButton();
+	     keys[i].setText(KEYS[i]);
+	     keys[i].setBounds(x,y,60,40);
+	     if(x<250) {
+	  x+=65;
+	     } 
+	     else {
+	  x=20;
+	  y+=45;
+	     }
+	     this.add(keys[i]);
+	 }
+	 for (int i=0;i<KEYS.length;i++)
+	 {
+	     keys[i].addActionListener(this);
+	 }
+	 this.setResizable(false);
+	 this.setBounds(500,200,670,480);
+	 this.setDefaultCloseOperation(EXIT_ON_CLOSE);
+	 this.setVisible(true);
+	    }
+	
+	public void init() {
+		resultText.setBackground(Color.WHITE);
+		JPanel calckeysPanel=new JPanel();
+	    resultText.setBackground(Color.WHITE);
+	    calckeysPanel.setLayout(new GridLayout(5,5,3,3));
+	    for(int i=0;i<keys.length;i++) {
+	    	keys[i]=new JButton(KEYS[i]);
+	    	calckeysPanel.add(keys[i]);
+	    	keys[i].setForeground(Color.BLACK);
+	    	keys[i].addActionListener(this);
+	    	this.setBackground(Color.LIGHT_GRAY);
+	    	this.pack();
+	    }
+	}
+	    
+	public String getA() {
+		return a;
+	}
+
+
+	public void setA(String a) {
+		this.a = a;
+	}
+	private String[] KEYS= {"7","8","9","+","sqrt","4","5","6","-","%","1","2","3",
+			"*","1/x","+/-","0","=","/",".","(",")","e","x*x","Bac","C","MC",
+			"pi","x^3","x^5"};
+	private JButton keys[]=new JButton[KEYS.length];
+	private JTextArea resultText=new JTextArea("0");
+	private JTextArea History=new JTextArea();
+	private JPanel j1=new JPanel();
+	private JPanel j2=new JPanel();
+	private JScrollPane g1=new JScrollPane(resultText);
+	private JScrollPane g2=new JScrollPane(History);
+	private JLabel label=new JLabel("鍘嗗彶璁板綍");
+	private String a="";
+	private JButton[] commands2;
+	private Array[] ms;
+	private JButton[] ms2;
+
+	public void actionPerformed(ActionEvent e) {
+		String p=e.getActionCommand();
+			String label=e.getActionCommand();
+			if(label=="=")
+			{
+				resultText.setText(this.a);
+				History.setText(History.getText()+resultText.getText());
+				if(label=="=")
+				{
+					String s[]=houzhui(this.a);
+					String result=Result(s);
+					this.a=result+"";
+					resultText.setText(this.a);
+					History.setText(History.getText()+"="+resultText.getText()+"\n");
+				}
+			}
+			else if(label=="C")
+			{
+				this.a="";
+				resultText.setText("0");
+			}
+			else if(label=="MC")
+			{
+				this.a="";
+				History.setText("0");
+			}
+			else if(label=="sqrt")
+			{
+				String n=kfys(this.a);
+				resultText.setText("sqrt"+"("+this.a+")"+"="+n);
+				History.setText(History.getText()+"sqrt"+"("+this.a+")"+"=");
+				this.a=n;
+			}
+			else if(label=="x*x")
+			{
+				String m=pfys(this.a);
+				resultText.setText(this.a+"^2"+"="+m);
+				History.setText(History.getText()+this.a+"^2"+"=");
+				this.a=m;
+			}
+			else if(label=="e")
+			{
+					String m=String.valueOf(2.7182818);
+					this.a=this.a+m;
+					resultText.setText(this.a);			
+			}
+			else if(label=="+/-")
+			{
+				String m=op(this.a);
+				resultText.setText("+/-"+this.a+"="+m);
+				History.setText(History.getText()+"+/-"+this.a+"=");
+				this.a=m;
+			}
+			else if(label=="Bac")
+			{
+				String m=ba(this.a);
+				resultText.setText(this.a=m);
+				this.a=m;
+			}
+			else if(label=="pi")
+			{
+					String m=String.valueOf(3.1415926);
+					this.a=this.a+m;
+					resultText.setText(this.a);			
+			}
+			else if(label=="x^3")
+			{
+				String m=pyf(this.a);
+				resultText.setText(this.a+"^3"+"="+m);
+				History.setText(History.getText()+this.a+"^3"+"=");
+				this.a=m;
+			}
+			else if(label=="x^5")
+			{
+				String m=j(this.a);
+				resultText.setText(this.a+"^5"+"="+m);
+				History.setText(History.getText()+this.a+"^5"+"=");
+				this.a=m;
+			}
+			else
+			{
+				this.a=this.a+label;
+				resultText.setText(this.a);
+			}
+	}
+
+	public void handleBac()
+	{
+		String g=resultText.getText();
+		g=g.substring(0,g.length()-4);
+		resultText.setText(g);
+	}
+	
+	private String[] houzhui(String str) {
+		 String c="";
+		 char opStack[]=new char[100];
+		 String postQueue[]=new String[100];
+		 int d=-1,f=0;
+		 for(int i=0;i<str.length();i++)
+		 {
+		     if("0123456789.".indexOf(str.charAt(i))>=0) 
+		     {
+		  c ="";
+		  for(;i<str.length()&&"0123456789.".indexOf(str.charAt(i))>=0;i++) 
+		  {
+		      c=c+str.charAt(i);
+		  }
+		  i--;
+		  postQueue[f]=c;
+		  f++;
+		     } else if("(".indexOf(str.charAt(i))>=0) 
+		     {
+		  d++;
+		  opStack[d]=str.charAt(i);
+		     } 
+		     else if(")".indexOf(str.charAt(i))>=0) 
+		     {
+		  for(;;)
+		  {
+		      if(opStack[d]!='(') 
+		      {
+		   postQueue[f]=opStack[d]+"";
+		   f++;
+		   d--;
+		      } 
+		      else 
+		      { 
+		   d--;
+		   break;
+		      }
+		  }
+		     }
+		     if("*%/".indexOf(str.charAt(i))>=0)
+		     {
+		  if(d==-1) 
+		  {
+		      d++;
+		      opStack[d]=str.charAt(i);
+		  } else {
+		      if ("*%/".indexOf(opStack[d])>=0) 
+		      {
+		   postQueue[f]=opStack[d]+"";
+		   f++;
+		   opStack[d]=str.charAt(i);
+		      } 
+		      else if("(".indexOf(opStack[d])>=0)
+		      {
+		   d++;
+		   opStack[d]=str.charAt(i);
+		      } 
+		      else if("+-".indexOf(str.charAt(i))>=0) {
+		   postQueue[f]=opStack[d] + "";
+		   f++;
+		   opStack[d]=str.charAt(i);
+		      }
+		  }
+		     } 
+		     else if("+-".indexOf(str.charAt(i))>=0) 
+		     {
+		  if(d==-1) 
+		  {
+		      d++;
+		      opStack[d]=str.charAt(i);
+		  } 
+		  else {
+		      if("*%/".indexOf(opStack[d])>=0) 
+		      {
+		   postQueue[f]=opStack[d]+"";
+		   f++;
+		   opStack[d]=str.charAt(i);
+		      } 
+		      else if("(".indexOf(opStack[d])>=0) 
+		      {
+		   d++;
+		   opStack[d]=str.charAt(i);
+		      } 
+		      else if("+-".indexOf(str.charAt(i))>=0) 
+		      {
+		   postQueue[f]=opStack[d]+"";
+		   f++;
+		   opStack[d]= str.charAt(i);
+		      }
+		  }
+		     }
+		 }
+		 for(;d!=-1;) 
+		 {
+		     postQueue[f]=opStack[d]+"";
+		     f++;
+		     d--;
+		 }
+		 return postQueue;
+		    }
+	
+	      public String Result(String str[]) {
+	   String Result[]=new String[100];
+	   int d=-1;
+	   for (int i=0;str[i]!=null;i++) 
+	   {
+	       if ("+-*%/".indexOf(str[i])<0) 
+	       {
+	    d++;
+	    Result[d]=str[i];
+	       }
+	       if ("+-*%/".indexOf(str[i])>=0)
+	       {
+	    double x,y,n;
+	    x=Double.parseDouble(Result[d]);
+	    d--;
+	    y=Double.parseDouble(Result[d]);
+	    d--;
+	    if ("-".indexOf(str[i])>=0) {
+	        n=y-x;
+	        d++;
+	        Result[d]=String.valueOf(n);
+	    }
+	    if ("+".indexOf(str[i])>=0) {
+	        n=y+x;
+	        d++;
+	        Result[d]=String.valueOf(n);
+	    }
+	    if ("*".indexOf(str[i])>=0) {
+	        n=y*x;
+	        d++;
+	        Result[d]=String.valueOf(n);
+
+	    }
+	    if ("/".indexOf(str[i])>=0)
+	    {
+	        if (x==0)
+	        {
+	     String s="error!";
+	     return s;
+	        } 
+	        else {
+	     n=y/x;
+	     d++;
+	     Result[d]=String.valueOf(n);
+	        }
+	    }
+	    if("%".indexOf(str[i])>=0) 
+	    {
+	        if (x==0)
+	        {
+	     String s="error!";
+	     return s;
+	        } 
+	        else {
+	     n=y%x;
+	     d++;
+	     Result[d]=String.valueOf(n);
+	        }
+	    }
+	    
+	       }
+	   }
+	   return Result[d];
+	      }
+	      
+	      public String kfys(String str) {
+	    	  String result="";
+	    	  double a=Double.parseDouble(str),b=0;
+	    	  b=Math.sqrt(a);
+	    	  result=String.valueOf(b);
+	    	  return result;
+	    	     }
+
+	    	     public String pfys(String str) {
+	    	  String result="";
+	    	  double a=Double.parseDouble(str),b=0;
+	    	  b=Math.pow(a,2);
+	    	  result=String.valueOf(b);
+	    	  return result;
+	    	     }
+			    
+	    	     public String op(String str) {
+	    	    	 String result="";
+	    	    	 double a=Double.parseDouble(str),b=0;
+	    	    	 b=-a;
+	    	    	 result=String.valueOf(b);
+	    	    	 return result;
+	    	     }
+	    	     
+	    	     public String ba(String str)
+	    	     {
+	    	    	 String l=resultText.getText();
+						l=l.substring(0,l.length()-1);
+						return l;
+	    	     }
+	    	     
+	    	     public String pyf(String str) {
+	   	    	  String result="";
+	   	    	  double a=Double.parseDouble(str),b=0;
+	   	    	  b=Math.pow(a,3);
+	   	    	  result=String.valueOf(b);
+	   	    	  return result;
+	   	    	     }
+	    	     
+	    	     public String j(String str) {
+		   	    	  String result="";
+		   	    	  double a=Double.parseDouble(str),b=0;
+		   	    	  b=Math.pow(a,5);
+		   	    	  result=String.valueOf(b);
+		   	    	  return result;
+	    	     }
+	    	     
+	private String p(String a2) {
+		// TODO 鑷姩鐢熸垚鐨勬柟娉曞瓨鏍�
+		return null;
+	}
+
+	private String k(String a2) {
+		// TODO 鑷姩鐢熸垚鐨勬柟娉曞瓨鏍�
+		return null;
+	}
+
+	public static String getCommands() {
+		return COMMANDS;
+	}
+
+	public static Icon[] getCommand() {
+		return COMMAND;
+	}
+
+	public static String getM() {
+		return M;
+	}
+
+	public JButton[] getCommands2() {
+		return commands2;
+	}
+
+	public void setCommands2(JButton[] commands2) {
+		this.commands2 = commands2;
+	}
+
+	public Array[] getMs() {
+		return ms;
+	}
+
+	public void setMs(Array[] ms) {
+		this.ms = ms;
+	}
+
+	public JButton[] getMs2() {
+		return ms2;
+	}
+
+	public void setMs2(JButton[] ms2) {
+		this.ms2 = ms2;
+	}
+}
+
diff --git "a/\350\256\241\347\256\227\345\231\250\347\254\254\345\205\255\346\254\241\346\217\220\344\272\244/.keep" "b/\350\256\241\347\256\227\345\231\250\347\254\254\345\205\255\346\254\241\346\217\220\344\272\244/.keep"
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git "a/\350\256\241\347\256\227\345\231\250\347\254\254\345\205\255\346\254\241\346\217\220\344\272\244/calculator/Calculator.java" "b/\350\256\241\347\256\227\345\231\250\347\254\254\345\205\255\346\254\241\346\217\220\344\272\244/calculator/Calculator.java"
new file mode 100644
index 0000000000000000000000000000000000000000..e1a68f18ce1dc843087c17f54d882cd0c18add21
--- /dev/null
+++ "b/\350\256\241\347\256\227\345\231\250\347\254\254\345\205\255\346\254\241\346\217\220\344\272\244/calculator/Calculator.java"
@@ -0,0 +1,469 @@
+package calculator;
+
+import javax.swing.*;
+
+import java2020spring.Const;
+
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.lang.reflect.Array;
+import java.awt.BorderLayout;
+import java.awt.Color;
+import java.awt.GridLayout;
+
+public class Calculator extends JFrame implements ActionListener{
+
+	private static final long serialVersionUID = 1L;
+		private static final String COMMANDS = null;
+		private static final Icon[] COMMAND = null;
+		private static final String M = null;
+	public static void main(String[] args) {
+		Calculator calculator=new Calculator();
+		calculator.setVisible(true);
+	}
+	
+	public Calculator() throws HeadlessException  {
+		super("Caculator");
+    	resultText.setAlignmentX(RIGHT_ALIGNMENT);
+    this.setTitle(Const.TITLE);
+	this.setSize(Const.FRAME_W,Const.FRAME_H);
+	this.setLayout(new BorderLayout());
+	this.setLocation(Const.FRAME_X,Const.FRAME_Y);
+	this.setResizable(false);
+	this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+	resultText.setBounds(20,18,255,115);
+	resultText.setAlignmentX(RIGHT_ALIGNMENT);
+	resultText.setEditable(false);
+	History.setBounds(290,40,250,370);
+	History.setAlignmentX(LEFT_ALIGNMENT);
+	History.setEditable(false);
+	label.setBounds(400,15,100,20);
+	j1.setBounds(20,18,320,115);
+	j1.setLayout(new GridLayout());
+	j2.setBounds(380,40,250,380);
+	j2.setLayout(new GridLayout());
+	resultText.setLineWrap(true);
+	resultText.setWrapStyleWord(true);
+	History.setLineWrap(true);
+	History.setWrapStyleWord(true);
+	g1.setViewportView(resultText);
+	g1.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
+	g2.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
+	g2.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
+	g2.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
+	j1.add(g1);
+	j2.add(g2);
+	this.add(j1);
+	this.add(j2);
+	this.setLayout(null);
+	this.add(label);
+	int x=20,y=150;
+	 for (int i=0;i<KEYS.length;i++)
+	 {
+	     keys[i]=new JButton();
+	     keys[i].setText(KEYS[i]);
+	     keys[i].setBounds(x,y,60,40);
+	     if(x<250) {
+	  x+=65;
+	     } 
+	     else {
+	  x=20;
+	  y+=45;
+	     }
+	     this.add(keys[i]);
+	 }
+	 for (int i=0;i<KEYS.length;i++)
+	 {
+	     keys[i].addActionListener(this);
+	 }
+	 this.setResizable(false);
+	 this.setBounds(500,200,670,480);
+	 this.setDefaultCloseOperation(EXIT_ON_CLOSE);
+	 this.setVisible(true);
+	    }
+	
+	public void init() {
+		resultText.setBackground(Color.WHITE);
+		JPanel calckeysPanel=new JPanel();
+	    resultText.setBackground(Color.WHITE);
+	    calckeysPanel.setLayout(new GridLayout(5,5,3,3));
+	    for(int i=0;i<keys.length;i++) {
+	    	keys[i]=new JButton(KEYS[i]);
+	    	calckeysPanel.add(keys[i]);
+	    	keys[i].setForeground(Color.BLACK);
+	    	keys[i].addActionListener(this);
+	    	this.setBackground(Color.LIGHT_GRAY);
+	    	this.pack();
+	    }
+	}
+	    
+	public String getA() {
+		return a;
+	}
+
+
+	public void setA(String a) {
+		this.a = a;
+	}
+	private String[] KEYS= {"7","8","9","+","sqrt","4","5","6","-","%","1","2","3",
+			"*","1/x","+/-","0","=","/",".","(",")","e","x*x","Bac","C","MC",
+			"pi","x^3","x^5"};
+	private JButton keys[]=new JButton[KEYS.length];
+	private JTextArea resultText=new JTextArea("0");
+	private JTextArea History=new JTextArea();
+	private JPanel j1=new JPanel();
+	private JPanel j2=new JPanel();
+	private JScrollPane g1=new JScrollPane(resultText);
+	private JScrollPane g2=new JScrollPane(History);
+	private JLabel label=new JLabel("历史记录");
+	private String a="";
+	private JButton[] commands2;
+	private Array[] ms;
+	private JButton[] ms2;
+
+	public void actionPerformed(ActionEvent e) {
+		String label=e.getActionCommand();
+			if(label=="=")
+			{
+				resultText.setText(this.a);
+				History.setText(History.getText()+resultText.getText());
+				if(label=="=")
+				{
+					String s[]=houzhui(this.a);
+					String result=Result(s);
+					this.a=result+"";
+					resultText.setText(this.a);
+					History.setText(History.getText()+"="+resultText.getText()+"\n");
+				}
+			}
+			else if(label=="C")
+			{
+				this.a="";
+				resultText.setText("0");
+			}
+			else if(label=="MC")
+			{
+				this.a="";
+				History.setText("0");
+			}
+			else if(label=="sqrt")
+			{
+				String n=kfys(this.a);
+				resultText.setText("sqrt"+"("+this.a+")"+"="+n);
+				History.setText(History.getText()+"sqrt"+"("+this.a+")"+"=");
+				this.a=n;
+			}
+			else if(label=="x*x")
+			{
+				String m=pfys(this.a);
+				resultText.setText(this.a+"^2"+"="+m);
+				History.setText(History.getText()+this.a+"^2"+"=");
+				this.a=m;
+			}
+			else if(label=="e")
+			{
+					String m=String.valueOf(2.7182818);
+					this.a=this.a+m;
+					resultText.setText(this.a);			
+			}
+			else if(label=="+/-")
+			{
+				String m=op(this.a);
+				resultText.setText("+/-"+this.a+"="+m);
+				History.setText(History.getText()+"+/-"+this.a+"=");
+				this.a=m;
+			}
+			else if(label=="Bac")
+			{
+				String m=ba(this.a);
+				resultText.setText(this.a=m);
+				this.a=m;
+			}
+			else if(label=="pi")
+			{
+					String m=String.valueOf(3.1415926);
+					this.a=this.a+m;
+					resultText.setText(this.a);			
+			}
+			else if(label=="x^3")
+			{
+				String m=pyf(this.a);
+				resultText.setText(this.a+"^3"+"="+m);
+				History.setText(History.getText()+this.a+"^3"+"=");
+				this.a=m;
+			}
+			else if(label=="x^5")
+			{
+				String m=j(this.a);
+				resultText.setText(this.a+"^5"+"="+m);
+				History.setText(History.getText()+this.a+"^5"+"=");
+				this.a=m;
+			}
+			else
+			{
+				this.a=this.a+label;
+				resultText.setText(this.a);
+			}
+	}
+
+	public void handleBac()
+	{
+		String g=resultText.getText();
+		g=g.substring(0,g.length()-4);
+		resultText.setText(g);
+	}
+	
+	private String[] houzhui(String str) {
+		 String c="";
+		 char opStack[]=new char[100];
+		 String postQueue[]=new String[100];
+		 int d=-1,f=0;
+		 for(int i=0;i<str.length();i++)
+		 {
+		     if("0123456789.".indexOf(str.charAt(i))>=0) 
+		     {
+		  c ="";
+		  for(;i<str.length()&&"0123456789.".indexOf(str.charAt(i))>=0;i++) 
+		  {
+		      c=c+str.charAt(i);
+		  }
+		  i--;
+		  postQueue[f]=c;
+		  f++;
+		     } else if("(".indexOf(str.charAt(i))>=0) 
+		     {
+		  d++;
+		  opStack[d]=str.charAt(i);
+		     } 
+		     else if(")".indexOf(str.charAt(i))>=0) 
+		     {
+		  for(;;)
+		  {
+		      if(opStack[d]!='(') 
+		      {
+		   postQueue[f]=opStack[d]+"";
+		   f++;
+		   d--;
+		      } 
+		      else 
+		      { 
+		   d--;
+		   break;
+		      }
+		  }
+		     }
+		     if("*%/".indexOf(str.charAt(i))>=0)
+		     {
+		  if(d==-1) 
+		  {
+		      d++;
+		      opStack[d]=str.charAt(i);
+		  } else {
+		      if ("*%/".indexOf(opStack[d])>=0) 
+		      {
+		   postQueue[f]=opStack[d]+"";
+		   f++;
+		   opStack[d]=str.charAt(i);
+		      } 
+		      else if("(".indexOf(opStack[d])>=0)
+		      {
+		   d++;
+		   opStack[d]=str.charAt(i);
+		      } 
+		      else if("+-".indexOf(str.charAt(i))>=0) {
+		   postQueue[f]=opStack[d] + "";
+		   f++;
+		   opStack[d]=str.charAt(i);
+		      }
+		  }
+		     } 
+		     else if("+-".indexOf(str.charAt(i))>=0) 
+		     {
+		  if(d==-1) 
+		  {
+		      d++;
+		      opStack[d]=str.charAt(i);
+		  } 
+		  else {
+		      if("*%/".indexOf(opStack[d])>=0) 
+		      {
+		   postQueue[f]=opStack[d]+"";
+		   f++;
+		   opStack[d]=str.charAt(i);
+		      } 
+		      else if("(".indexOf(opStack[d])>=0) 
+		      {
+		   d++;
+		   opStack[d]=str.charAt(i);
+		      } 
+		      else if("+-".indexOf(str.charAt(i))>=0) 
+		      {
+		   postQueue[f]=opStack[d]+"";
+		   f++;
+		   opStack[d]= str.charAt(i);
+		      }
+		  }
+		     }
+		 }
+		 for(;d!=-1;) 
+		 {
+		     postQueue[f]=opStack[d]+"";
+		     f++;
+		     d--;
+		 }
+		 return postQueue;
+		    }
+	
+	      public String Result(String str[]) {
+	   String Result[]=new String[100];
+	   int d=-1;
+	   for (int i=0;str[i]!=null;i++) 
+	   {
+	       if ("+-*%/".indexOf(str[i])<0) 
+	       {
+	    d++;
+	    Result[d]=str[i];
+	       }
+	       if ("+-*%/".indexOf(str[i])>=0)
+	       {
+	    double x,y,n;
+	    x=Double.parseDouble(Result[d]);
+	    d--;
+	    y=Double.parseDouble(Result[d]);
+	    d--;
+	    if ("-".indexOf(str[i])>=0) {
+	        n=y-x;
+	        d++;
+	        Result[d]=String.valueOf(n);
+	    }
+	    if ("+".indexOf(str[i])>=0) {
+	        n=y+x;
+	        d++;
+	        Result[d]=String.valueOf(n);
+	    }
+	    if ("*".indexOf(str[i])>=0) {
+	        n=y*x;
+	        d++;
+	        Result[d]=String.valueOf(n);
+
+	    }
+	    if ("/".indexOf(str[i])>=0)
+	    {
+	        if (x==0)
+	        {
+	     String s="error!";
+	     return s;
+	        } 
+	        else {
+	     n=y/x;
+	     d++;
+	     Result[d]=String.valueOf(n);
+	        }
+	    }
+	    if("%".indexOf(str[i])>=0) 
+	    {
+	        if (x==0)
+	        {
+	     String s="error!";
+	     return s;
+	        } 
+	        else {
+	     n=y%x;
+	     d++;
+	     Result[d]=String.valueOf(n);
+	        }
+	    }
+	    
+	       }
+	   }
+	   return Result[d];
+	      }
+	      
+	      public String kfys(String str) {
+	    	  String result="";
+	    	  double a=Double.parseDouble(str),b=0;
+	    	  b=Math.sqrt(a);
+	    	  result=String.valueOf(b);
+	    	  return result;
+	    	     }
+
+	    	     public String pfys(String str) {
+	    	  String result="";
+	    	  double a=Double.parseDouble(str),b=0;
+	    	  b=Math.pow(a,2);
+	    	  result=String.valueOf(b);
+	    	  return result;
+	    	     }
+			    
+	    	     public String op(String str) {
+	    	    	 String result="";
+	    	    	 double a=Double.parseDouble(str),b=0;
+	    	    	 b=-a;
+	    	    	 result=String.valueOf(b);
+	    	    	 return result;
+	    	     }
+	    	     
+	    	     public String ba(String str)
+	    	     {
+	    	    	 String l=resultText.getText();
+						l=l.substring(0,l.length()-1);
+						return l;
+	    	     }
+	    	     
+	    	     public String pyf(String str) {
+	   	    	  String result="";
+	   	    	  double a=Double.parseDouble(str),b=0;
+	   	    	  b=Math.pow(a,3);
+	   	    	  result=String.valueOf(b);
+	   	    	  return result;
+	   	    	     }
+	    	     
+	    	     public String j(String str) {
+		   	    	  String result="";
+		   	    	  double a=Double.parseDouble(str),b=0;
+		   	    	  b=Math.pow(a,5);
+		   	    	  result=String.valueOf(b);
+		   	    	  return result;
+	    	     }
+	    	     
+	public static String getCommands() {
+		return COMMANDS;
+	}
+
+	public static Icon[] getCommand() {
+		return COMMAND;
+	}
+
+	public static String getM() {
+		return M;
+	}
+
+	public JButton[] getCommands2() {
+		return commands2;
+	}
+
+	public void setCommands2(JButton[] commands2) {
+		this.commands2 = commands2;
+	}
+
+	public Array[] getMs() {
+		return ms;
+	}
+
+	public void setMs(Array[] ms) {
+		this.ms = ms;
+	}
+
+	public JButton[] getMs2() {
+		return ms2;
+	}
+
+	public void setMs2(JButton[] ms2) {
+		this.ms2 = ms2;
+	}
+}
+
+
+
+
diff --git "a/\350\256\241\347\256\227\345\231\250\347\254\254\345\205\255\346\254\241\346\217\220\344\272\244/java2020spring/Const.java" "b/\350\256\241\347\256\227\345\231\250\347\254\254\345\205\255\346\254\241\346\217\220\344\272\244/java2020spring/Const.java"
new file mode 100644
index 0000000000000000000000000000000000000000..32cb2830d6ffee4d39fad8d14fd7a6fdbfdc0cf4
--- /dev/null
+++ "b/\350\256\241\347\256\227\345\231\250\347\254\254\345\205\255\346\254\241\346\217\220\344\272\244/java2020spring/Const.java"
@@ -0,0 +1,14 @@
+package java2020spring;
+
+import java.awt.*;
+
+public class Const {
+	public static final int FRAME_W=300;
+	public static final int FRAME_H=300;
+	public static final int SCREEN_W=Toolkit.getDefaultToolkit().getScreenSize().width;
+	public static final int SCREEN_H=Toolkit.getDefaultToolkit().getScreenSize().height;
+	public static final int FRAME_X=(SCREEN_W-FRAME_W)/2;
+	public static final int FRAME_Y=(SCREEN_H-FRAME_H)/2;
+	public static final String TITLE="计算器";
+	
+}
diff --git "a/\350\256\241\347\256\227\345\231\250\347\254\254\345\205\255\346\254\241\346\217\220\344\272\244/java2020spring/resultText.java" "b/\350\256\241\347\256\227\345\231\250\347\254\254\345\205\255\346\254\241\346\217\220\344\272\244/java2020spring/resultText.java"
new file mode 100644
index 0000000000000000000000000000000000000000..9a0cb4fa92f95953971677602c6761c238598de4
--- /dev/null
+++ "b/\350\256\241\347\256\227\345\231\250\347\254\254\345\205\255\346\254\241\346\217\220\344\272\244/java2020spring/resultText.java"
@@ -0,0 +1,17 @@
+package java2020spring;
+
+import java.awt.Color;
+
+public class resultText {
+
+	public static void setHorizontalAlignment(int right) {
+		// TODO 自动生成的方法存根
+		
+	}
+
+	public static void setBackground(Color white) {
+		// TODO 自动生成的方法存根
+		
+	}
+
+}
diff --git "a/\350\256\241\347\256\227\345\231\250\347\254\254\345\233\233\346\254\241\346\217\220\344\272\244" "b/\350\256\241\347\256\227\345\231\250\347\254\254\345\233\233\346\254\241\346\217\220\344\272\244"
new file mode 100644
index 0000000000000000000000000000000000000000..f41a4acd3e2f9e77c6379874aa32a70582a5ce26
--- /dev/null
+++ "b/\350\256\241\347\256\227\345\231\250\347\254\254\345\233\233\346\254\241\346\217\220\344\272\244"
@@ -0,0 +1,400 @@
+package calculator;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.lang.reflect.Array;
+import java.awt.BorderLayout;
+import java.awt.Color;
+import java.awt.GridLayout;
+import javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+
+import java2020spring.Const;
+
+public class Calculator extends JFrame implements ActionListener{
+	private static final long serialVersionUID = 1L;
+		private static final String COMMANDS = null;
+		private static final Icon[] COMMAND = null;
+		private static final String M = null;
+		
+	public static void main(String[] args) {
+		Calculator calculator=new Calculator();
+		calculator.setVisible(true);
+	}
+	
+	public Calculator() throws HeadlessException  {
+		super("Caculator");
+    	resultText.setAlignmentX(RIGHT_ALIGNMENT);
+    this.setTitle(Const.TITLE);
+	this.setSize(Const.FRAME_W,Const.FRAME_H);
+	this.setLayout(new BorderLayout());
+	this.setLocation(Const.FRAME_X,Const.FRAME_Y);
+	this.setResizable(false);
+	this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+	resultText.setBounds(20,18,255,115);
+	resultText.setAlignmentX(RIGHT_ALIGNMENT);
+	resultText.setEditable(false);
+	History.setBounds(290,40,250,370);
+	History.setAlignmentX(LEFT_ALIGNMENT);
+	History.setEditable(false);
+	label.setBounds(400,15,100,20);
+	j1.setBounds(20,18,320,115);
+	j1.setLayout(new GridLayout());
+	j2.setBounds(380,40,250,380);
+	j2.setLayout(new GridLayout());
+	resultText.setLineWrap(true);
+	resultText.setWrapStyleWord(true);
+	History.setLineWrap(true);
+	History.setWrapStyleWord(true);
+	g1.setViewportView(resultText);
+	g1.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
+	g2.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
+	g2.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
+	g2.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
+	j1.add(g1);
+	j2.add(g2);
+	this.add(j1);
+	this.add(j2);
+	this.setLayout(null);
+	this.add(label);
+	int x=20,y=150;
+	 for (int i=0;i<KEYS.length;i++)
+	 {
+	     keys[i]=new JButton();
+	     keys[i].setText(KEYS[i]);
+	     keys[i].setBounds(x,y,60,40);
+	     if(x<250) {
+	  x+=65;
+	     } 
+	     else {
+	  x=20;
+	  y+=45;
+	     }
+	     this.add(keys[i]);
+	 }
+	 for (int i=0;i<KEYS.length;i++)
+	 {
+	     keys[i].addActionListener(this);
+	 }
+	 this.setResizable(false);
+	 this.setBounds(500,200,670,480);
+	 this.setDefaultCloseOperation(EXIT_ON_CLOSE);
+	 this.setVisible(true);
+	    }
+	
+	public void init() {
+		resultText.setBackground(Color.WHITE);
+		JPanel calckeysPanel=new JPanel();
+	    resultText.setBackground(Color.WHITE);
+	    calckeysPanel.setLayout(new GridLayout(5,5,3,3));
+	    for(int i=0;i<keys.length;i++) {
+	    	keys[i]=new JButton(KEYS[i]);
+	    	calckeysPanel.add(keys[i]);
+	    	keys[i].setForeground(Color.BLACK);
+	    	keys[i].addActionListener(this);
+	    	this.setBackground(Color.LIGHT_GRAY);
+	    	this.pack();
+	    }
+	}
+	    
+	public String getA() {
+		return a;
+	}
+
+
+	public void setA(String a) {
+		this.a = a;
+	}
+	private String[] KEYS= {"7","8","9","+","sqrt","4","5","6","-","%","1","2","3",
+			"*","1/x","+/-","0","=","/",".","(",")","e","x*x","Bac","C","MC",
+			"MR","MS","M+"};
+	private JButton keys[]=new JButton[KEYS.length];
+	private JTextArea resultText=new JTextArea("0");
+	private JTextArea History=new JTextArea();
+	private JPanel j1=new JPanel();
+	private JPanel j2=new JPanel();
+	private JScrollPane g1=new JScrollPane(resultText);
+	private JScrollPane g2=new JScrollPane(History);
+	private JLabel label=new JLabel("鍘嗗彶璁板綍");
+	private String a="";
+	private JButton[] commands2;
+	private Array[] ms;
+	private JButton[] ms2;
+
+	public void actionPerformed(ActionEvent e) {
+			String label=e.getActionCommand();
+			if(label=="=")
+			{
+				resultText.setText(this.a);
+				History.setText(History.getText()+resultText.getText());
+				if(label=="=")
+				{
+					String s[]=houzhui(this.a);
+					String result=Result(s);
+					this.a=result+"";
+					resultText.setText(this.a);
+					History.setText(History.getText()+"="+resultText.getText()+"\n");
+				}
+			}
+			else if(label=="AC")
+			{
+				this.a="";
+				resultText.setText("0");
+			}
+			else if(label=="sqrt")
+			{
+				String n=k(this.a);
+				resultText.setText("sqqrt"+"("+this.a+")"+"="+n);
+				History.setText(History.getText()+"sqrt"+"("+this.a+")"+"=");
+				this.a=n;
+			}
+			else if(label=="x*x")
+			{
+				String m=p(this.a);
+				resultText.setText(this.a+"^2"+"="+m);
+				History.setText(History.getText()+this.a+"^2"+"=");
+				this.a=m;
+			}
+			else if(label=="e"||label=="pi")
+			{
+				if(label=="e")
+				{
+					String m=String.valueOf(2.7182818);
+					this.a=this.a+m;
+					resultText.setText(this.a);
+				}
+				if(label=="pi")
+				{
+					String m=String.valueOf(3.1415926);
+					this.a=this.a+m;
+					resultText.setText(this.a);
+				}
+			}
+			else
+			{
+				this.a=this.a+label;
+				resultText.setText(this.a);
+			}
+	}
+
+	private String[] houzhui(String str) {
+		 String c="";
+		 char opStack[]=new char[100];
+		 String postQueue[]=new String[100];
+		 int d=-1,f=0;
+		 for(int i=0;i<str.length();i++)
+		 {
+		     if("0123456789.".indexOf(str.charAt(i))>=0) 
+		     {
+		  c ="";
+		  for(;i<str.length()&&"0123456789.".indexOf(str.charAt(i))>=0;i++) 
+		  {
+		      c=c+str.charAt(i);
+		  }
+		  i--;
+		  postQueue[f]=c;
+		  f++;
+		     } else if("(".indexOf(str.charAt(i))>=0) 
+		     {
+		  d++;
+		  opStack[d]=str.charAt(i);
+		     } 
+		     else if(")".indexOf(str.charAt(i))>=0) 
+		     {
+		  for(;;)
+		  {
+		      if(opStack[d]!='(') 
+		      {
+		   postQueue[f]=opStack[d]+"";
+		   f++;
+		   d--;
+		      } 
+		      else 
+		      { 
+		   d--;
+		   break;
+		      }
+		  }
+		     }
+		     if("*%/".indexOf(str.charAt(i))>=0)
+		     {
+		  if(d==-1) 
+		  {
+		      d++;
+		      opStack[d]=str.charAt(i);
+		  } else {
+		      if ("*%/".indexOf(opStack[d])>=0) 
+		      {
+		   postQueue[f]=opStack[d]+"";
+		   f++;
+		   opStack[d]=str.charAt(i);
+		      } 
+		      else if("(".indexOf(opStack[d])>=0)
+		      {
+		   d++;
+		   opStack[d]=str.charAt(i);
+		      } 
+		      else if("+-".indexOf(str.charAt(i))>=0) {
+		   postQueue[f]=opStack[d] + "";
+		   f++;
+		   opStack[d]=str.charAt(i);
+		      }
+		  }
+		     } 
+		     else if("+-".indexOf(str.charAt(i))>=0) 
+		     {
+		  if(d==-1) 
+		  {
+		      d++;
+		      opStack[d]=str.charAt(i);
+		  } 
+		  else {
+		      if("*%/".indexOf(opStack[d])>=0) 
+		      {
+		   postQueue[f]=opStack[d]+"";
+		   f++;
+		   opStack[d]=str.charAt(i);
+		      } 
+		      else if("(".indexOf(opStack[d])>=0) 
+		      {
+		   d++;
+		   opStack[d]=str.charAt(i);
+		      } 
+		      else if("+-".indexOf(str.charAt(i))>=0) 
+		      {
+		   postQueue[f]=opStack[d]+"";
+		   f++;
+		   opStack[d]= str.charAt(i);
+		      }
+		  }
+		     }
+		 }
+		 for(;d!=-1;) 
+		 {
+		     postQueue[f]=opStack[d]+"";
+		     f++;
+		     d--;
+		 }
+		 return postQueue;
+		    }
+	
+	      public String Result(String str[]) {
+	   String Result[]=new String[100];
+	   int Top=-1;
+	   for (int i=0;str[i]!=null;i++) 
+	   {
+	       if ("+-*%/".indexOf(str[i])<0) 
+	       {
+	    Top++;
+	    Result[Top]=str[i];
+	       }
+	       if ("+-*%/".indexOf(str[i])>=0)
+	       {
+	    double x,y,n;
+	    x=Double.parseDouble(Result[Top]);
+	    Top--;
+	    y=Double.parseDouble(Result[Top]);
+	    Top--;
+	    if ("-".indexOf(str[i])>=0) {
+	        n=y-x;
+	        Top++;
+	        Result[Top]=String.valueOf(n);
+	    }
+	    if ("+".indexOf(str[i])>=0) {
+	        n=y+x;
+	        Top++;
+	        Result[Top]=String.valueOf(n);
+	    }
+	    if ("*".indexOf(str[i])>=0) {
+	        n=y*x;
+	        Top++;
+	        Result[Top]=String.valueOf(n);
+
+	    }
+	    if ("/".indexOf(str[i])>=0)
+	    {
+	        if (x==0)
+	        {
+	     String s="error!";
+	     return s;
+	        } 
+	        else {
+	     n=y/x;
+	     Top++;
+	     Result[Top]=String.valueOf(n);
+	        }
+	    }
+	    if("%".indexOf(str[i])>=0) 
+	    {
+	        if (x==0)
+	        {
+	     String s="error!";
+	     return s;
+	        } 
+	        else {
+	     n=y%x;
+	     Top++;
+	     Result[Top]=String.valueOf(n);
+	        }
+	    }
+	    
+	       }
+	   }
+	   return Result[Top];
+	      }
+	      
+	      
+			    
+	private String p(String a2) {
+		// TODO 鑷姩鐢熸垚鐨勬柟娉曞瓨鏍�
+		return null;
+	}
+
+	private String k(String a2) {
+		// TODO 鑷姩鐢熸垚鐨勬柟娉曞瓨鏍�
+		return null;
+	}
+
+	public static String getCommands() {
+		return COMMANDS;
+	}
+
+	public static Icon[] getCommand() {
+		return COMMAND;
+	}
+
+	public static String getM() {
+		return M;
+	}
+
+	public JButton[] getCommands2() {
+		return commands2;
+	}
+
+	public void setCommands2(JButton[] commands2) {
+		this.commands2 = commands2;
+	}
+
+	public Array[] getMs() {
+		return ms;
+	}
+
+	public void setMs(Array[] ms) {
+		this.ms = ms;
+	}
+
+	public JButton[] getMs2() {
+		return ms2;
+	}
+
+	public void setMs2(JButton[] ms2) {
+		this.ms2 = ms2;
+	}
+}
+
+
+
+