计算器案例

package com.zhang.Study.计算器案例;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class Caculater {
    public static void main(String[] args) {
        new Mycaculter();
    }
}
class Mycaculter extends Frame{
    public Mycaculter(){
        TextField num1 = new TextField(10);//创建文本框，设定最大字符数为10
        TextField num2 = new TextField(10);
        TextField num3 = new TextField(10);
        //设置一个标签
        Label label = new Label("+");
        //设置一个按钮
        Button button = new Button("=");
        //添加按钮监听事件
        button.addActionListener(new MycaculterListener(num1,num2,num3));
        //布局，采用流式布局，从左到右排列
        setLayout(new FlowLayout());
        add(num1);
        add(label);
        add(num2);
        add(button);
        add(num3);
        setVisible(true);
    }

}
class  MycaculterListener implements ActionListener{
    //获取三个变量
    private  TextField num1,num2,num3;
    //重载构造器，获取三个参数赋给三个值。
    public MycaculterListener(TextField num1,TextField num2,TextField num3){
        this.num1= num1;
        this.num2=num2;
        this.num3 = num3;
    }
    @Override
    public void actionPerformed(ActionEvent e) {
    //1.获得加数和被加数
        int n1 = Integer.parseInt(num1.getText());//integer把String类转换成int类
        int n2 = Integer.parseInt(num2.getText());
        //2.将这个值进行加法运算后，放入第三个框
                num3.setText(""+(n1+n2));
        //清除前两个元素
        num1.setText("");
        num2.setText("");


    }
}