texteventtest.java

java图形界面的课堂代码

package day12;
import java.awt.*;
import java.awt.event.*;

import javax.swing.*;
public class TextEventTest {
	private JFrame jf;
	private JButton save;
	private TextArea area;
	private JScrollPane jsp; //可滚屏的面板
	
	public TextEventTest(){
		jf=new JFrame("Text Event Test");
		save=new JButton("Save");
		save.setEnabled(false);
		area=new TextArea(20,40);
		jsp=new JScrollPane(area);
		init();
		addEventHandler();
	}
	
	public void addEventHandler(){
		area.addTextListener(new TextListener(){
			public void textValueChanged(TextEvent arg0) {
				save.setEnabled(true);
			}
		});
		
		save.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent arg0) {
				save.setEnabled(false);
			}
		});
	}
	
	public void init(){
		JPanel p1=new JPanel();
		p1.add(save);
		jf.add(p1,BorderLayout.NORTH);
		jf.add(jsp,BorderLayout.CENTER);
	}
	
	public void showMe(){
		jf.pack();
		jf.setVisible(true);
		jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		new TextEventTest().showMe();
	}

}