lesson9 简易计算器-1

package com.zym.lesson9;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

//简易计算器
public class TestCalc {

    public static void main(String[] args) {
            new Calculator();
    }
}

//计算器类
class Calculator extends JFrame {
    //构造器
    public Calculator() {

        //三个文本框
        TextField num1 = new TextField(10);
        TextField num2 = new TextField(10);
        TextField num3 = new TextField(20);

        //一个按钮
        Button button = new Button("=");

        //对按钮添加一个事件
        button.addActionListener(new MyCalculatorListener(num1,num2,num3));

        //一个标签
        Label label = new Label("+");

        //流式布局
        setLayout(new FlowLayout());
        //添加组件
        add(num1);
        add(label);
        add(num2);
        add(button);
        add(num3);

        //自适应大小
        pack();
        //设置可见
        setVisible(true);

        addWindowListener(new WindowAdapter() {
                              //窗体关闭时做的事
                              @Override
                              public void windowClosing(WindowEvent e) {
                                  // super.windowClosed(e);
                                  System.exit(0);
                              }
                          }
        );
    }
}



//监听器类
class MyCalculatorListener implements ActionListener {



    //获取三个变量
    private TextField num1,num2,num3;
     //以参数的形式传递进来
     public MyCalculatorListener(TextField num1,TextField num2,TextField num3){
      this.num1=num1;
      this.num2=num2;
      this.num3=num3;

     }

    @Override
    public void actionPerformed(ActionEvent e) {
          // 1获得加数与被加数


        //num1.getText()
        //Integer.getInteger()
       int n1= Integer.parseInt(num1.getText());
       int n2= Integer.parseInt(num2.getText());

         // 2  将这个值加法运行后，放到第三个框中
        num3.setText(""+(n1+n2));


         // 3 清除前两个框
        num1.setText("");
        num2.setText("");

        
    }
}