怎么用swing完成一个简单的加法计算！

如图:
![img](https://img-mid.csdnimg.cn/release/static/image/mid/ask/3

要求: 用基本的Swing窗口程序，实现类似求和计算 这样简单的 JFrame窗口程序，会用Action事件；

我有写过这种swing窗体。把文体替换就好了，如果不会，我可以帮你替换。可以看一下:
如有帮助，请点击我回答右上角【采纳】按钮。

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
public class SummationForm extends JFrame implements ActionListener {
    private static final long serialVersionUID = -3059616600875760053L;
    JLabel labMathematics, labEnglish, labTotal;
    JTextField textMathematics, textEnglish, textTotal;
    static JButton butSummation,butReturn;
    public SummationForm() {
        labMathematics = new JLabel("第一个数");
        labEnglish = new JLabel("第二个数");
        labTotal = new JLabel("结果");
        textMathematics = new JTextField("", 10);
        textEnglish = new JTextField("", 10);
        textTotal = new JTextField("", 10);
        butSummation = new JButton("求和");
        butReturn = new JButton("退出");
        labMathematics.setBounds(30, 30, 120, 30);
        textMathematics.setBounds(180, 30, 120, 30);
        labEnglish.setBounds(30, 80, 120, 30);
        textEnglish.setBounds(180, 80, 120, 30);
        labTotal.setBounds(30, 130, 120, 30);
        textTotal.setBounds(180, 130, 120, 30);
        butSummation.setBounds(80, 180, 80, 30);
        butReturn.setBounds(200, 180, 80, 30);
        add(labMathematics);
        add(textMathematics);
        add(labEnglish);
        add(textEnglish);
        add(labTotal);
        add(textTotal);
        add(butSummation);
        add(butReturn);
        setLayout(null);
        setBounds(200, 100, 400, 300);
        // 窗口在屏幕中间显示
        setLocationRelativeTo(null);
        setTitle("求和");
        setResizable(false);
        setVisible(true);
    }
    public static void main(String[] args) {
        SummationForm summationForm = new SummationForm();
        butSummation.addActionListener(summationForm);
        butReturn.addActionListener(summationForm);
        summationForm.add(butSummation);
        summationForm.add(butReturn);
    }
    public void actionPerformed(ActionEvent e) {
        JButton jb = (JButton) e.getSource();
        if (jb == butSummation) {
            String Mathematics = textMathematics.getText();
            String English = textEnglish.getText();
            try {
                int a = Integer.parseInt(Mathematics);
                int b = Integer.parseInt(English);
                int t = a + b;
                textTotal.setText(String.valueOf(t));
            } catch (Exception e2) {
                JOptionPane.showMessageDialog(this, "输入的格式错误！", "提示对话框", JOptionPane.DEFAULT_OPTION);
            }
        }else if(jb == butReturn){
            System.exit(0);
        }
    }
}

有个加减乘除的。

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;

import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class 简单计算器  extends JFrame implements ActionListener{
    JTextField txtNum1,txtNum2,txtNum3;
    JComboBox<String> cbOpr;
    String opr[] = {"+","-","*","/"};
    JButton btnCalc;
    public 简单计算器() {
        super("简单计算器");
        
        txtNum1 = new JTextField(6);
        cbOpr = new JComboBox<String>(opr);
        txtNum2 = new JTextField(6);
        txtNum3 = new JTextField(6);
        btnCalc = new JButton("=");
        JPanel northPane = new JPanel(new FlowLayout());
        northPane.add(txtNum1);
        northPane.add(cbOpr);
        northPane.add(txtNum2);
        northPane.add(btnCalc);
        northPane.add(txtNum3);
        txtNum3.setEnabled(false);
        add(northPane);
        btnCalc.addActionListener(this);
        this.pack();
        setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
        
    }
    @Override
    public void actionPerformed(ActionEvent e) {
        
        try {
            double num1 = Double.parseDouble(txtNum1.getText());
            double num2 = Double.parseDouble(txtNum2.getText());
            
            String line = num1 + "";
            int index = cbOpr.getSelectedIndex();
            switch(index) {
            case 0:
                txtNum3.setText((num1+num2)+"");
                line+= "+";
                break;
            case 1:
                txtNum3.setText((num1-num2)+"");
                line+= "-";
                break;
            case 2:
                txtNum3.setText((num1*num2)+"");
                line+= "*";
                break;
            case 3:
                txtNum3.setText((num1/num2)+"");
                line+= "/";
                break;
            }
            line+= num2 + "=" + txtNum3.getText();
            //保存到文件
            BufferedWriter br = new BufferedWriter(new FileWriter("d:\\calc.txt",true));
            br.write(line);
            br.newLine();
            br.close();
        }catch(Exception ex){
            System.out.println("出错了"+ex.getMessage());
        }
    }
    public static void main(String[] args) {
        new 简单计算器();
    }
}