diff --git a/Mycalculator1 b/Mycalculator1
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+++ b/Mycalculator1
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+package java2020spring;
+
+import java.awt.BorderLayout;
+import java.awt.Color;
+import java.awt.FlowLayout;
+import java.awt.GridLayout;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import javax.swing.*;
+
+
+ 
+public class Mycalculator1 extends JFrame  implements ActionListener{
+	String num1[]= {"7","8","9","/","sqrt","4","5","6","*","%","1","2","3","-","1/x","0","+/-",".","+","="};//记录基本按钮的数组
+	String m[]= {" ","MC","MR","MS","M+"};
+	String key1[]= {"Backspace","CE","C"};
+	JTextField text=new JTextField("0");
+	JPanel numPanel,keyPanel,MPanel,textPanel,Panel;
+	JButton NUM1[]=new JButton[num1.length];
+	JButton KEY1[]=new JButton[key1.length];
+	JButton M[]=new JButton[m.length];
+	boolean firstCheck=true;
+	double result=0.0;
+	String operate="=";
+	boolean operateFlag=true;//判断有没有操作错误
+	void Mycalcultor() {
+		init();
+		this.setResizable(false);
+		pack();
+	}	
+	//初始化计算器
+	//设计计算器界面
+	 void init() {
+		//初始化键盘上的键位，放在一个面板上
+		numPanel=new JPanel();
+		keyPanel=new JPanel();
+		MPanel=new JPanel();
+		GridLayout grid1=new GridLayout(4,5,3,3);
+		numPanel.setLayout(grid1);
+		//初始化按钮，把按钮加到面板内，加装监听器
+		for(int i=0;i<num1.length;i++) {
+			NUM1[i]=new JButton(num1[i]);
+			numPanel.add(NUM1[i]);
+			NUM1[i].addActionListener(this);
+		}
+		//初始化m
+		GridLayout grid2=new GridLayout(5,1,3,3);//行、列、左右间距、上下间距
+		MPanel.setLayout(grid2);
+		for(int i=0;i<m.length;i++) {
+			M[i]=new JButton(m[i]);
+			MPanel.add(M[i]);
+			M[i].addActionListener(this);	
+		}
+		//初始化key
+		GridLayout grid3=new GridLayout();
+		keyPanel.setLayout(grid3);
+		for(int i=0;i<key1.length;i++) {
+			KEY1[i]=new JButton(key1[i]);
+			keyPanel.add(KEY1[i]);
+			KEY1[i].addActionListener(this);
+		}
+		text.setHorizontalAlignment(JTextField.RIGHT);//右对齐
+		textPanel=new JPanel();//外层平板、放入text
+		textPanel.setLayout(new BorderLayout());
+		textPanel.add("Center",text);
+		Panel = new JPanel();//内层大平板放入m num
+		Panel.setLayout(new BorderLayout(3,3));
+		Panel.add("Center",numPanel);
+		Panel.add("North",keyPanel);
+		//整体的布局
+		 getContentPane().setLayout(new BorderLayout(3, 3));
+	     getContentPane().add("North",textPanel);
+	     getContentPane().add("Center", Panel);
+	     getContentPane().add("West", MPanel);
+	 }
+	
+	@Override
+	public void actionPerformed(ActionEvent e) {
+		String label =e.getActionCommand();
+		if(label.equals(key1[0]))
+			tuige(label);
+		
+		else if(label.equals(key1[2]))
+			clear(label);
+		else if(("0123456789".indexOf(label)>0))
+			numAct(label);
+		else 
+			handleOperator(label);
+	
+	}
+	private void handleOperator(String key) {
+		if(operate.equals("/")) {
+			 
+            // 如果当前结果文本框中的值等于0
+			if(getNumberFromText() == 0.0) {
+				//操作不合法
+				operateFlag = false;
+                text.setText("除数不能为零");
+			} else {
+                result /= getNumberFromText();
+            }
+		 } else if (operate.equals("1/x")) {
+	            
+	            if (result == 0.0) {
+	                // 操作不合法
+	                operateFlag = false;
+	                text.setText("零没有倒数");
+	            } else {
+	                result = 1 / result;
+	            }
+	        } else if (operate.equals("+")) {
+	           
+	            result += getNumberFromText();
+	        } else if (operate.equals("-")) {
+	           
+	            result -= getNumberFromText();
+	        } else if (operate.equals("*")) {
+	           
+	            result *= getNumberFromText();
+	        } else if (operate.equals("sqrt")) {
+	           
+	            result = Math.sqrt(result);
+	        } else if (operate.equals("%")) {
+	            
+	        	result = result%getNumberFromText();
+	        } else if (operate.equals("+/-")) {
+	           
+	            result = result * (-1);
+	        } else if (operate.equals("=")) {
+	           
+	            result = getNumberFromText();
+	        }
+	        if (operateFlag) {
+	            // 双精度浮点数的运算
+	            long t1;
+	            double t2;
+	            t1 = (long) result;
+	            t2 = result - t1;
+	            if (t2 == 0) {
+	                text.setText(String.valueOf(t1));
+	            } else {
+	                text.setText(String.valueOf(result));
+	            }
+	        }
+	        // 运算符等于用户按的按钮
+	        operate = key;
+	        firstCheck = true;
+	        operateFlag = true;
+		}
+
+	private void numAct(String key) {
+		if(firstCheck) {
+			//输入第一个数字
+			text.setText(key);
+		} else if ((key.equals(".")) && (text.getText().indexOf(".") < 0)) {
+			 
+            text.setText(text.getText() + ".");  
+		} else if (!key.equals(".")) {
+            
+            text.setText(text.getText() + key);
+        }
+		// 以后输入的肯定不是第一个数字了
+        firstCheck = false;
+	}
+	
+	private void clear(String label) {
+		  // 初始化计算器的各种值
+        text.setText("0");
+        firstCheck = true;
+        operate = "=";
+		
+	}
+	
+	private void tuige(String label) {
+		String result = text.getText();
+		int i =result.length();
+		if(i>0) {
+			//退格，将文本最后一个字符去掉
+			result=result.substring(0, i-1);
+			if(i==0) {
+				//如果文本框没有内容，则初始化计算器的各种值
+				text.setText("0");
+				firstCheck = true;
+				operate = "=";
+			}else {
+				//显示新的文本
+				text.setText(result);
+			}
+		}
+		
+	}
+	
+    private double getNumberFromText() {
+        double number = 0;
+        try {
+            number = Double.valueOf(text.getText()).doubleValue();//字符串转化为数值
+        } catch (NumberFormatException e) {
+        }
+        return number;
+    }
+
+	public static void main(String args[]) {
+		Mycalculator1 calcultor1=new Mycalculator1();
+		calcultor1.Mycalcultor();
+		calcultor1.setTitle("标准计算器");
+		calcultor1.setBounds(100,300,400,220);
+		calcultor1.setVisible(true);
+		calcultor1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+		}
+}
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