applet程序之间的通信

[java]代码库

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Enumeration;

public class GetApplets extends Applet implements ActionListener {
	private TextArea textArea; // 声明一个TextArea
	private String newline;

	public void init() {
		Button b = new Button("Click to call getApplets()");
		b.addActionListener(this);
		setLayout(new BorderLayout());

		add("North", b);
		textArea = new TextArea(5, 40);
		textArea.setEditable(false);
		add("Center", textArea);
		newline = System.getProperty("line,separator");
		// 取得系统当前的换行符
	}

	public void actionPerformed(ActionEvent event) {
		/* Button b点击后的事件处理函数 */
		printApplets();
	}

	public String getAppletInfo() {
		return "GetApplets by Dong.li";
	}

	public void printApplets() {
		Enumeration e = getAppletContext().getApplets();
		/* 得到当前网页所有的Applet对象 */
		textArea.append("Results of getApplets():" + newline);
		while (e.hasMoreElements()) {
			Applet applet = (Applet) e.nextElement();
			String info = ((Applet) applet).getAppletInfo();
			/* 逐个取得当前网页Applet对象的信息 */
			if (info != null) {
				textArea.append("-" + info + newline);
				/* 在textArea中输出网页所有Applet的信息 */
			} else {
				textArea.append("-" + applet.getClass().getName() + newline);
			}
		}
		textArea.append("__________" + newline + newline);
	}
}