getapplets.java

来自「java applet编程,实现对相关图片声音的调用」· Java 代码 · 共 59 行

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

public class GetApplets extends Applet implements ActionListener
{
    private TextArea 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");
    }

    public void actionPerformed(ActionEvent event)
    {
        printApplets();
    }

    public String getAppletInfo()
    {
        return "Applet GetApplets by lyw.";
    }

    public void printApplets()
    {
        //Enumeration will contain all applets on this page
        //(including this one) that we can send messages to.
        Enumeration e = getAppletContext().getApplets();

        textArea.append("Results of getApplets():" + newline);

        while (e.hasMoreElements())
        {
            Applet applet = (Applet)e.nextElement();
            String info = ((Applet)applet).getAppletInfo();
            if (info != null)
            {
                textArea.append("- " + info + newline);
            }else
	{
                textArea.append("- " 	+ applet.getClass().getName() + newline);
            } 
        }
        textArea.append("________________________"   + newline + newline);
    }
}