java–gui_简单计算器

在这里插入图片描述

package cn.usts.edu.lesson02;

import java.awt.*;
import java.awt.event.*;

public class Calculator {

    public static void main(String[] args) {
        // 开始
        new MyFrame01();
    }
}

class MyFrame01 extends Frame{
    public MyFrame01(){
        setLocation(400,400);
        setVisible(true);
        // 设置布局
        setLayout(new FlowLayout());
        // 设置文本框
        TextField first = new TextField(10);    // 设置框的大小
        TextField second = new TextField(10);
        TextField result = new TextField(10);
        // 按钮
        Button button = new Button("=");
        button.addActionListener(new CalculatorActionListener(first,second,result));
        // 添加进frame
        add(first);
        add(second);
        add(button);
        add(result);

        pack();

        // 点击关闭
        addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });

    }
}


// 监听器
class  CalculatorActionListener implements ActionListener {
    private TextField first,second,result;
    public CalculatorActionListener(TextField first,TextField second,TextField result) {
        this.first = first;
        this.second = second;
        this.result =result;
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        // 获取字符值
        int num1 = Integer.parseInt(first.getText());
        int num2 = Integer.parseInt(second.getText());
        // 进行运算
        result.setText(""+(num1+num2));
        // 返回结果
        first.setText("");
        second.setText("");


    }
}