GUI02

简易计算器，组合+内部类

oop面向对象原则：组合大于继承

package GUI02;

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();
  }
}

// 计算器类
class Calculator extends Frame {

  public Calculator() {
    // 3个文本框
    TextField num1 = new TextField(10);//字符数
    TextField num2 = new TextField(10);
    TextField num3 = new TextField(20);//字符长一点
    // 1个按钮
    Button button = new Button("=");
    button.addActionListener(new MyCalculatorListener(num1, num2, num3));
    // 1个标签
    Label label = new Label("+");
    // 布局
    setLayout(new FlowLayout());
    add(num1);
    add(label);
    add(num2);
    add(button);
    add(num3);
    pack();
    setVisible(true);

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

}

// 监听器类
class MyCalculatorListener implements ActionListener {

  // 获取三个变量
  private TextField num1, num2, num3;//传进三个文本框参数

  public MyCalculatorListener(TextField num1, TextField num2, TextField num3) {
    this.num1 = num1;
    this.num2 = num2;
    this.num3 = num3;
  }


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

    //  将这个值+运算后放到第三个框
    num3.setText("" + (n1 + n2));
    //    清除两个框
    num1.setText("");
    num2.setText("");


  }

}

优化代码 cmd+alt+l

    package GUI02;

import java.awt.Button;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.Label;
import java.awt.TextField;
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 TestCalc2 {

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

// 计算器类
class Calculator2 extends Frame {

  // 属性
  TextField num1, num2, num3;

  // 方法
  public void loadFrame() {
    // 3个文本框
    num1 = new TextField(10);//字符数
    num2 = new TextField(10);
    num3 = new TextField(20);//字符长一点
    // 1个按钮
    Button button = new Button("=");
    button.addActionListener(new MyCalculatorListener2(this));
    // 1个标签
    Label label = new Label("+");
    // 布局
    setLayout(new FlowLayout());
    add(num1);
    add(label);
    add(num2);
    add(button);
    add(num3);
    pack();
    setVisible(true);

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

}

// 监听器类
class MyCalculatorListener2 implements ActionListener {

  Calculator2 calculator2 = null;

  // 获取计算器这个对象,在一个类中组合另外一个类
  public MyCalculatorListener2(Calculator2 calculator2) {
    this.calculator2 = calculator2;
  }


  @Override
  public void actionPerformed(ActionEvent e) {
    //获得加数和被加数
    int n1 = Integer.parseInt(calculator2.num1.getText());
    int n2 = Integer.parseInt(calculator2.num2.getText());

    //  将这个值+运算后放到第三个框
    calculator2.num3.setText("" + (n1 + n2));
    //    清除两个框
    calculator2.num1.setText("");
    calculator2.num2.setText("");


  }

}

内部类优化

   package GUI02;

import java.awt.Button;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.Label;
import java.awt.TextField;
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 TestCalc3 {

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

// 计算器类
class Calculator3 extends Frame {

  // 属性
  TextField num1, num2, num3;

  // 方法
  public void loadFrame() {
    // 3个文本框
    num1 = new TextField(10);//字符数
    num2 = new TextField(10);
    num3 = new TextField(20);//字符长一点
    // 1个按钮
    Button button = new Button("=");
    button.addActionListener(new MyCalculatorListener3());
    // 1个标签
    Label label = new Label("+");
    // 布局
    setLayout(new FlowLayout());
    add(num1);
    add(label);
    add(num2);
    add(button);
    add(num3);
    pack();
    setVisible(true);

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


  // 监听器类
  private class MyCalculatorListener3 implements ActionListener {


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

      //  将这个值+运算后放到第三个框
      num3.setText("" + (n1 + n2));
      //    清除两个框
      num1.setText("");
      num2.setText("");


    }

  }
}