java:java中一个最简单的事件练习,…

package com.xudeyu.frame;

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.JTextField;

public class EditText {

public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
EditTest test = new EditTest();
test.setDefaultCloseOperation(3);
test.setVisible(true);
}
});
}

}

class EditTest extends JFrame {
public EditTest() {
setTitle("EditText");
setSize(300, 400);

final JTextField tx = new JTextField("Test!");
tx.copy();
final JTextArea txarea = new JTextArea();

tx.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
txarea.setText(tx.getText());
}
});

add(tx, BorderLayout.NORTH);
add(txarea, BorderLayout.CENTER);

}
}