tfmath.java

非常简单的计算器

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

public class TFMath {
	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 lblPlus = new Label("+");
		Button btnEqual = new Button("=");
		btnEqual.addActionListener(new MyMonitor());
		setLayout(new FlowLayout());
		add(num1);
		add(lblPlus);
		add(num2);
		add(btnEqual);
		add(num3);
		pack();
		setVisible(true);
	}
	
	private class MyMonitor implements ActionListener  {
		public void actionPerformed(ActionEvent e) {
			int n1 = Integer.parseInt(num1.getText());
			int n2 = Integer.parseInt(num2.getText());
			num3.setText("" + (n1+n2));
		}
	}
	
}


//class MyMonitor implements ActionListener {
	//TextField num1, num2, num3;
	/*
	public MyMonitor(TextField num1, TextField num2, TextField num3) {
		this.num1 = num1;
		this.num2 = num2;
		this.num3 = num3;
	}
	*/
/*	
	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());
		tf.num3.setText("" + (n1+n2));
		
	}
}

*/