java例程练习（简单的计算器[调停者 设计模式 及 内部类 ]）

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

public class TestInnerClass {

    public static void main(String[] args) {
    	new TFFrame().launchFrame();
    }

}

class TFFrame extends Frame {
	public void launchFrame() {
		TextField num1 = new TextField(10);
		TextField num2 = new TextField(10);
		TextField num3 = new TextField(15);
		Label lbPlus = new Label("+");
		Button btnEqual = new Button("=");
		setLayout(new FlowLayout());
		add(num1);
		add(lbPlus);
		add(num2);
		add(btnEqual);
		add(num3);
		btnEqual.addActionListener(new MyMonitor(num1, num2, num3));
		pack();
		setVisible(true);
	}

}

class MyMonitor implements ActionListener {
	TextField num1,num2,num3;
	MyMonitor(TextField num1, TextField num2, TextField num3) {//用构造函数实现
		this.num1 = num1;
		this.num2 = num2;
		this.num3 = num3;
	}


	public void actionPerformed(ActionEvent e) {
		int n1 = Integer.parseInt(num1.getText());
		int n2 = Integer.parseInt(num2.getText());
		int n3 = n1 + n2;
		num3.setText("" + n3);

	}
}

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

public class TestInnerClass {

    public static void main(String[] args) {
    	new TFFrame().launchFrame();
    }

}

class TFFrame extends Frame {
	public void launchFrame() {
		TextField num1 = new TextField(10);
		TextField num2 = new TextField(10);
		TextField num3 = new TextField(15);
		Label lbPlus = new Label("+");
		Button btnEqual = new Button("=");
		setLayout(new FlowLayout());
		add(num1);
		add(lbPlus);
		add(num2);
		add(btnEqual);
		add(num3);
		btnEqual.addActionListener(new MyMonitor(this/*num1, num2, num3*/));
		pack();
		setVisible(true);
	}

}

class MyMonitor implements ActionListener {
//	TextField num1,num2,num3;
//	MyMonitor(TextField num1, TextField num2, TextField num3) {
//		this.num1 = num1;
//		this.num2 = num2;
//		this.num3 = num3;
//	}

	 //持有对方的引用
	TFFrame tf = null;
	public MyMonitor(TFFrame tf) {
		this.tf = tf;
	}

	public void actionPerformed(ActionEvent e) {
		int n1 = Integer.parseInt(tf.num1.getText());
		int n2 = Integer.parseInt(tf.num2.getText());
		int n3 = n1 + n2;
		tf.num3.setText("" + n3);

	}
}

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

public class TestInnerClass {

    public static void main(String[] args) {
    	new TFFrame().launchFrame();
    }

}

class TFFrame extends Frame {
	TextField num1, num2, num3;
	public void launchFrame() {
		num1 = new TextField(10);
		num2 = new TextField(10);
		num3 = new TextField(15);
		Label lbPlus = new Label("+");
		Button btnEqual = new Button("=");
		setLayout(new FlowLayout());
		add(num1);
		add(lbPlus);
		add(num2);
		add(btnEqual);
		add(num3);
		btnEqual.addActionListener(new MyMonitor());
		pack();
		setVisible(true);
	}

	//内部类:1，方便的访问包装类的成员
	//       2，该类不允许或不需要其他类进行访问
	class MyMonitor implements ActionListener {
		public void actionPerformed(ActionEvent e) {
			int n1 = Integer.parseInt(num1.getText());
			int n2 = Integer.parseInt(num2.getText());
			int n3 = n1 + n2;
			num3.setText("" + n3);
		}
	}

}