jtextusedemo.java

JAVA编程思想源代码 值得一下 很难找的

package chapter11;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class JTextUseDemo extends JApplet implements ActionListener {

	Container ctp = getContentPane();

	JLabel lb1 = new JLabel("第一个数:", JLabel.CENTER), lb2 = new JLabel("第二个数:",
			JLabel.CENTER), lb3 = new JLabel("结果:", JLabel.CENTER);

	JTextField tf1 = new JTextField(8), tf2 = new JTextField(8);

	JTextArea tf3 = new JTextArea(3, 8);

	JButton bt = new JButton("计算");

	public void init() {
		ctp.setLayout(new GridLayout(4, 2));
		ctp.add(lb1);
		ctp.add(tf1);
		ctp.add(lb2);
		ctp.add(tf2);
		ctp.add(lb3);
		ctp.add(tf3);
		ctp.add(bt);
		bt.addActionListener(this);
	}

	public void actionPerformed(ActionEvent e) {
		int x, y, z;
		String xx = tf1.getText();
		String yy = tf2.getText();
		if ((xx == null) || (xx.equals("")) || (yy.equals("")) || (yy == null))
			tf3.setText("请输入相应的参数！！");
		else {
			x = Integer.parseInt(xx);
			y = Integer.parseInt(yy);
			z = x * y;
			tf3.setText(String.valueOf(z));
		}

	}
}