简易计算器，组合+内部类回顾复习

package com.jia.lesson;

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) {
        Calculator calculator = new Calculator();
        calculator.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }
}

//计算器类
class Calculator extends frame{
    public Calculator(){

        //3个文本框
        TextField num1 = new TextField();
        TextField num2 = new TextField();
        TextField num3 = new TextField();

        //1个按钮
        Button button = new Button("=");
        button.addActionListener(new MyActionListener3(num1,num2,num3));

        //1个标签
        Label label = new Label("+");

        //流式布局
        setLayout(new FlowLayout());

        add(num1);
        add(label);
        add(num2);
        add(button);
        add(num3);

        pack();//自动适应布局
        setVisible(true);
    }
}

//监听器类
class MyActionListener3 implements ActionListener{

    //获取三个变量
    private TextField num1,num2,num3;

    public MyActionListener3(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());
        int n2=Integer.parseInt(num2.getText());

        //2.将这个值+法运算后，放到第三个框
        num3.setText(""+(n1+n2));

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

2.组合方法

package com.jia.lesson;

//组合方法
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().loadframe();
        new Calculator().addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }
}

//计算器类
class Calculator extends frame {

    //属性
    TextField num1, num2, num3;

    //方法
    public void loadframe() {

        num1 = new TextField();
        num2 = new TextField();
        num3 = new TextField();

        //1个按钮
        Button button = new Button("=");
        button.addActionListener(new MyActionListener3(this));

        //1个标签
        Label label = new Label("+");

        //流式布局
        setLayout(new FlowLayout());

        add(num1);
        add(label);
        add(num2);
        add(button);
        add(num3);

        pack();//自动适应布局
        setVisible(true);
    }
}

//监听器类
class MyActionListener3 implements ActionListener {

    //获取计算器这个对象，在一个类中组合另外一个类
    Calculator calculator = null;

    public MyActionListener3(Calculator calculator) {
        this.calculator = calculator;
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        //1.获得加数和被加数
        int n1 = Integer.parseInt(calculator.num1.getText());
        int n2 = Integer.parseInt(calculator.num2.getText());

        //2.将这个值+法运算后，放到第三个框
        calculator.num3.setText("" + (n1 + n2));

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

3.内部类

package com.jia.lesson;

//内部类方法

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().loadframe();

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


//计算器框架
class Calculator extends frame {

    //属性
    TextField num1, num2, num3;

    //加载框架方法
    public void loadframe() {

        num1 = new TextField();
        num2 = new TextField();
        num3 = new TextField();

        //1个按钮
        Button button = new Button("=");

        button.addActionListener(new MyActionListener3());

        //1个标签
        Label label = new Label("+");

        //流式布局
        setLayout(new FlowLayout());

        add(num1);
        add(label);
        add(num2);
        add(button);
        add(num3);

        pack();//自动适应布局
        setVisible(true);
    }

    //监听器内部类
    //内部类的好处，可以畅通无阻的访问外部的属性和方法
    private class MyActionListener3 implements ActionListener {
        @Override
        public void actionPerformed(ActionEvent e) {
            //1.获得加数和被加数
            int n1 = Integer.parseInt(num1.getText());
            int n2 = Integer.parseInt(num2.getText());

            //2.将这个值+法运算后，放到第三个框
            num3.setText("" + (n1 + n2));

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