diff --git a/src/java2022spring/Calculator.java b/src/java2022spring/Calculator.java
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index 0000000000000000000000000000000000000000..7cf5e85659edd54f18e294c8167945a75f852105
--- /dev/null
+++ b/src/java2022spring/Calculator.java
@@ -0,0 +1,273 @@
+package java2022spring;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;

public class Calculator extends JFrame implements ActionListener{
+	//显示窗体并居中
+	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 int frame_x=(SCREEN_W-FRAME_W)/2;
+	public int frame_y=(SCREEN_H-FRAME_H)/2;
+	
+	//计算器功能键显示
+	private final String[] KEYS= {"1","2","3","/","sqrt","4","5","6",
+			"*","%","7","8","9","-","1/x","0","+/-",".","+","="};
+	private final String[] COMMAND= {"Backspace","CE","C"};
+	private final String[] M= {" ","MC","MR","MS","M+"};
+	private JButton keys[]=new JButton[KEYS.length];
+	private JButton commands[]=new JButton[COMMAND.length];
+	private JButton m[]=new JButton[M.length];
+	private JTextField resultText=new JTextField("0");
+	
+	//用户按的是否是整个表达式的第一个数字。或是运算符后的第一个数字
+	private boolean firstDigit=true;
+	//计算的中间结果
+	private double resultNum=0.0;
+	//当前运算的运算符
+	private String operator="=";
+	//操作是否合法
+	private boolean operateValidFlag=true;
+	
+	//计算器北面
+	private JPanel jp_north=new JPanel();
+	private JTextField input1_text=new JTextField();
+			
+	//初始化计算器
+	public void init() {
+		this.setTitle("vv的计算器");
+		int width=0;int height=0;
+		this.setSize(width=400,height=300);
+		this.setLayout(new BorderLayout());
+		this.setResizable(false);
+		this.setLocation(frame_x,frame_y);
+		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+		
+		this.input1_text.setPreferredSize(new Dimension(250,30));
+		jp_north.add(input1_text);
+		this.add(jp_north,BorderLayout.NORTH);
+
+		
+		//初始化计算器上的按钮，用网络布局器，4行5列，网格之间水平方向间隔为3个像素，垂直方向间隔为3个像素
+		JPanel calckeysPanel=new JPanel();
+		calckeysPanel.setLayout(new GridLayout(4,5,3,3));
+		for(int i=0;i<KEYS.length;i++) {
+			keys[i]=new JButton(KEYS[i]);
+			calckeysPanel.add(keys[i]);
+			keys[i].setForeground(Color.blue);
+		}
+		
+		//文本框里右对齐
+		resultText.setHorizontalAlignment(JTextField.RIGHT);
+		//初始化功能键，用网络布局器，1行3列，网格之间水平方向间隔为3个像素，垂直方向间隔为3个像素
+		JPanel commandsPanel=new JPanel();
+		commandsPanel.setLayout(new GridLayout(1,3,3,3));
+		for(int i=0;i<COMMAND.length;i++) {
+			commands[i]=new JButton(COMMAND[i]);
+			commandsPanel.add(commands[i]);
+			commands[i].setForeground(Color.red);
+		}
+		
+		//初始化M键，用网络布局器，5行1列，网格之间水平方向间隔为3个像素，垂直方向间隔为3个像素
+		JPanel calmsPanel=new JPanel();
+		calmsPanel.setLayout(new GridLayout(5,1,3,3));
+		for(int i=0;i<M.length;i++) {
+			m[i]=new JButton(M[i]);
+			calmsPanel.add(m[i]);
+			m[i].setForeground(Color.red);
+		}
+		
+//计算器的整体布局，将calckeys和command面板放在计算器的中部
+		//新建大面板，将command和calckeys画板放在该画板内
+		JPanel panel1=new JPanel();
+		//画板采用边界布局管理，画板内组件之间水平和垂直方向间隔为3像素
+		panel1.setLayout(new BorderLayout(3,3));
+		panel1.add("North",commandsPanel);
+		panel1.add("Center",calckeysPanel);
+		
+		//建立一个画板放文本框
+		JPanel top=new JPanel();
+		top.setLayout(new BorderLayout());
+		top.add("Center",resultText);
+		
+		//整体布局
+        getContentPane().setLayout(new BorderLayout(3, 5));
+        getContentPane().add("North", top);
+        getContentPane().add("Center", panel1);
+        getContentPane().add("West", calmsPanel);
+        // 为各按钮添加事件侦听器
+        // 都使用同一个事件侦听器，即本对象。本类的声明中有implements ActionListener
+        for (int i = 0; i < KEYS.length; i++) {
+            keys[i].addActionListener(this);
+        }
+        for (int i = 0; i < COMMAND.length; i++) {
+            commands[i].addActionListener(this);
+        }
+        for (int i = 0; i < M.length; i++) {
+            m[i].addActionListener(this);
+        }
+    }
+ 
+//处理事件
+	public void actionPerformed(ActionEvent e) {
+		String label=e.getActionCommand();
+		if(label.equals(COMMAND[0])) {
+			handleBackspace();//按"Backspace"键
+		}
+		else if(label.equals(COMMAND[1])) {
+			resultText.setText("0");//按"CE"键	
+		}
+		else if (label.equals(COMMAND[2])) {
+            handleC();// 用户按了"C"键
+        } 
+		else if ("0123456789.".indexOf(label) >= 0) {
+            handleNumber(label);// 用户按了数字键或者小数点键
+            // handlezero(zero);
+        } 
+		else {  
+            handleOperator(label);// 用户按了运算符键
+        }
+	}
+
+
+	//处理按Backspace键的事件
+	private void handleBackspace() {
+		String text=resultText.getText();
+		int i=text.length();
+		if(i>0) {
+			text=text.substring(0,i-1);//退格，去掉文本最后一个字符
+			if(text.length()==0) {
+				resultText.setText("0");
+				firstDigit=true;
+				operator="=";//若文本没有内容了，就初始化计算器的各值
+			}
+			else {
+				resultText.setText(text);//显示新的文本
+			}
+		}
+	}
+	
+	//处理按C键的事件
+	private void handleC() {
+		resultText.setText("0");
+		firstDigit=true;
+		operator="=";//归零
+	}
+		
+	//处理按数字键的事件
+	private void handleNumber(String key) {
+		if(firstDigit) {
+			resultText.setText(key);//输入第一个数字
+		}
+		else if((key.equals("."))&&(resultText.getText().indexOf(".")<0)) {
+		    resultText.setText(resultText.getText()+".");//输入小数点，之前无小数点则将小数点写在文本框后面
+		}
+		else if(!key.equals(".")) {
+			resultText.setText(resultText.getText()+key);//输入的不是小数点，则将数字卸载文本框后面
+		}
+		firstDigit=false;//之后输入的就不是第一个数字了
+	}
+	
+
+	//处理按运算键的事件
+	   private void handleOperator(String key) {
+	        if (operator.equals("/")) {// 除法运算
+	            // 如果当前结果文本框中的值等于0         
+	            if (getNumberFromText() == 0.0) {	               
+	                operateValidFlag = false; // 操作不合法
+	                resultText.setText("除数不能为零");
+	            } 
+	            else {
+	                resultNum /= getNumberFromText();
+	            }
+	        } 
+	        else if (operator.equals("1/x")) {	            
+	            // 倒数运算  
+	        	if (resultNum == 0.0) {            
+	                operateValidFlag = false;// 操作不合法
+	                resultText.setText("零没有倒数");
+	            } 
+	            else {
+	                resultNum = 1 / resultNum;
+	            }
+	        }
+	        else if (operator.equals("+")) {
+	            // 加法运算
+	            resultNum += getNumberFromText();
+	        }
+	        else if (operator.equals("-")) {
+	            // 减法运算
+	            resultNum -= getNumberFromText();
+	        }
+	        else if (operator.equals("*")) {
+	            // 乘法运算
+	            resultNum *= getNumberFromText();
+	        }
+	        else if (operator.equals("sqrt")) {
+	            // 平方根运算
+	            resultNum = Math.sqrt(resultNum);
+	        } 
+	        else if (operator.equals("%")) {
+	            // 百分号运算（除以100）
+	            resultNum = resultNum / 100;
+	        } 
+	        else if (operator.equals("+/-")) {
+	            // 正数负数运算
+	            resultNum = resultNum * (-1);
+	        }
+	        else if (operator.equals("=")) {
+	            // 赋值运算
+	            resultNum = getNumberFromText();
+	        }
+	        if (operateValidFlag) {
+	            // 双精度浮点数的运算
+	            long t1;
+	            double t2;
+	            t1 = (long) resultNum;
+	            t2 = resultNum - t1;
+	            if (t2 == 0) {
+	                resultText.setText(String.valueOf(t1));
+	            } 
+	            else {
+	                resultText.setText(String.valueOf(resultNum));
+	            }
+	        }	       
+	        operator = key;
+	        firstDigit = true;
+	        operateValidFlag = true; // 运算符等于用户按的按钮
+	    }
+	   
+	//从文本框中获取数字
+	private double getNumberFromText() {
+		double result=0;
+		try {
+			result=Double.valueOf(resultText.getText()).doubleValue();		
+		}catch(NumberFormatException e) {
+		}
+		return result;
+	}
+		
+	
+	public Calculator() throws HeadlessException {
+		this.init();
+
+	}
+	
+    public static void main(String args[]) {
+        Calculator calculator1 = new Calculator();
+        calculator1.setVisible(true);
+        calculator1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+    }
+
+
+	
+
+	
+
+
+	
+	
+}