[Java] java简易计算器

import java.awt.*;
import java.awt.event.*;
 
public class calculator {
    public static void main(String[] args) {
        new mycalc();
    }
}
class mycalc extends Frame {
    public mycalc(){
        Button button1 = new Button("compute");
        Button button2 = new Button("empty");
        TextField textField1 = new TextField(10);
        TextField textField2 = new TextField(10);
        TextField textField3 = new TextField(10);
        Label label1 = new Label("+");
        Label label2 = new Label("=");
        this.setTitle("计算器");
        this.setBackground(new Color(255, 255, 255));
        this.setBounds(500,500,236,80);
        this.setVisible(true);
        this.setLayout(new FlowLayout());
        this.add(textField1);
        this.add(label1);
        this.add(textField2);
        this.add(label2);
        this.add(textField3);
        this.add(button1);
        this.add(button2);
        this.pack();
        mywframe myframe = new mywframe();
        this.addWindowListener(myframe);
        mybuttonlistener mybuttonlistener = new mybuttonlistener(textField1,textField2,textField3);
        button1.addActionListener(mybuttonlistener);
        mybutton2listener mybutton2listener = new mybutton2listener(textField1,textField2,textField3);
        button2.addActionListener(mybutton2listener);
    }
}
class mybuttonlistener implements ActionListener {
    private TextField num4;
    private TextField num5;
    private TextField num6;
    public mybuttonlistener(TextField num1,TextField num2,TextField num3){
        this.num4 = num1;
        this.num5 = num2;
        this.num6 = num3;
    }
    @Override
    public void actionPerformed(ActionEvent e) {
        int num7 = Integer.parseInt(num4.getText());
        int num8 = Integer.parseInt(num5.getText());
        num6.setText(""+(num7+num8));
    }
}
class mybutton2listener implements ActionListener{
    private TextField num4;
    private TextField num5;
    private TextField num6;
    public mybutton2listener(TextField num1,TextField num2,TextField num3){
        this.num4 = num1;
        this.num5 = num2;
        this.num6 = num3;
    }
    @Override
    public void actionPerformed(ActionEvent e) {
        num4.setText("");
        num5.setText("");
        num6.setText("");
    }
}
class mywframe implements WindowListener{
    @Override
    public void windowOpened(WindowEvent e) {
 
    }
 
    @Override
    public void windowClosing(WindowEvent e) {
        System.exit(0);
    }
 
    @Override
    public void windowClosed(WindowEvent e) {
 
    }
 
    @Override
    public void windowIconified(WindowEvent e) {
 
    }
 
    @Override
    public void windowDeiconified(WindowEvent e) {
 
    }
 
    @Override
    public void windowActivated(WindowEvent e) {
 
    }
 
    @Override
    public void windowDeactivated(WindowEvent e) {
 
    }
}