第11章 GUI 09 持有对方引用

鱼欲遇雨：每日都学习一点，持之以恒，天道酬勤！不能用电脑时，提前补上！（2012.9.15）

// TFMath.java

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

public class TFMath {
	public static void main(String args[]) {
		new TFFrame3().launchFrame();
	}
}

class TFFrame3 extends Frame {
	TextField number1, number2, number3;
	public void launchFrame() {
		number1 = new TextField(10);
		number2 = new TextField(10);
		number3 = new TextField(15);
		Label lbPlus = new Label("+");
		Button btnEqual = new Button("=");
		btnEqual.addActionListener(new MyMonitor());
		setLayout(new FlowLayout());
		add(number1);
		add(lbPlus);
		add(number2);
		add(btnEqual);
		add(number3);
		pack();
		setVisible(true);
	}
	
	private class MyMonitor implements ActionListener {
		public void actionPerformed(ActionEvent e){
			int n1 = Integer.parseInt(number1.getText());
			int n2 = Integer.parseInt(number2.getText());
			number3.setText(" " + (n1 + n2));
			System.out.println("apk");
		}
	}
}
/*
class MyMonitor implements ActionListener {
	//TextField num1, num2, num3;
	/*
	MyMonitor(TextField num1, TextField num2 , TextField num3) {
		this.num1 = num1;
		this.num2 = num2;
		this.num3 = num3;
	}
	*/
	/*
	TFFrame3 tf = null;
	public MyMonitor(TFFrame3 tf) {
		this.tf = tf;
	}

	public void actionPerformed(ActionEvent e){
		int n1 = Integer.parseInt(tf.number1.getText());
		int n2 = Integer.parseInt(tf.number2.getText());
		tf.number3.setText(" " + (n1 + n2));
		System.out.println("apk");
	}
}
*/