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  1. 03-02-2010, 03:06 AM #1
    pyat77
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    Unhappy java.lang.ArrayIndexOutOfBoundsException: 6

    While trying to learn how to make applets I tried to make a homepage for myself with revolving links.

    It compiled just fine but when I try to open it in firefox or appletviewer it gives me the error:
    java.lang.ArrayIndexOutOfBoundsException: 6

    This is my code.

    import java.applet.*;
    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
    import java.net.*;
    Java Code: 
    public class Revolve extends JApplet 
	implements Runnable, ActionListener {
		String pageTitle[] = new String[6];
		URL pageLink[] = new URL[6];
		int current = 0;
		Thread runner;

		public void init() {
			Color background = new Color(255,255,204);
			setBackground(background);
			
			pageTitle[0] = "Facebook";
			pageLink[0] = getURL("http://www.facebook.com");
			pageTitle[1] = "Hotmail";
			pageLink[1] = getURL("http://www.hotmail.com");
			pageTitle[2] = "Youtube.com";
			pageLink[2] = getURL("http://www.youtube.com");
			pageTitle[3] = "Google";
			pageLink[3] = getURL("http://www.google.com");
			pageTitle[4] = "My Life Is Average";
			pageLink[4] = getURL("http://www.mylifeisaverage.com");
			pageTitle[5] = "I Can Has Cheezeburger";
			pageLink[5] = getURL("http://www.icanhascheezeburger.com");
			pageTitle[6] = "Albino Blacksheep";
			pageLink[6] = getURL("http://www.albinoblacksheep.com");
			Button goButton = new Button("Go");
			goButton.addActionListener(this);
			FlowLayout flow = new FlowLayout();
			Container pane = getContentPane();
			pane.setLayout(flow);
			pane.add(goButton);
			setContentPane(pane);
		}

		URL getURL(String urlText) {
			URL pageURL = null;
			try {
				pageURL = new URL(getDocumentBase(), urlText);
			}
			catch (MalformedURLException m) { }
			return pageURL;
		}

		public void paint(Graphics screen) {
			super.paint(screen);
			Graphics2D screen2D = (Graphics2D) screen;
			screen2D.drawString(pageTitle[current], 5, 60);
			screen2D.drawString("" + pageLink[current], 5, 80);
		}

		public void start() {
			if (runner == null) {
				runner = new Thread(this);
				runner.start();
			}
		}

		public void run() {
			Thread thisThread = Thread.currentThread();
			while (runner == thisThread) {
				repaint();
				current++;
				if (current > 5)
					current = 0;
				try {
					Thread.sleep(10000);
				} catch (InterruptedException e) { }
			}
		}

	public void stop() {
		if (runner != null) {
			runner = null;
		}
	}

	public void actionPerformed(ActionEvent evt) {
		if (runner != null) {
			runner = null;
		}
		AppletContext browser = getAppletContext();
		if (pageLink[current] != null)
			browser.showDocument(pageLink[current]);
	}
}
    Also, could there be something wrong with my html?

    XML Code: 
    <html>
<head>
<title>Paul's Home Page</title>
</head>
<body bgcolor="#C4C4C4">
<font face="Arial" size=3>
<table>
<tr>

<td bgcolor="#FFCCFF" width=300 valign="TOP" align="CENTER">
<h2>Paul's Home Page</h2>
<p>Welcome! This page is under construction.
</td>

<td bgcolor="#FFFFCC" width=200 valigh="TOP" align="RIGHT">
<i><b>Some of my favorite links:</b></i>
<applet code="Revolve.class" height=100 width=200>
</applet>
<center>
<i>Click to visit</i>
</center>
</td>

</tr>
</table>
</font>
</body>
</html>
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  2. 03-02-2010, 03:15 AM #2
    Fubarable's Avatar
    Fubarable
    Fubarable is offline Moderator
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    Default

    Arrays are 0-based, meaning that an array that has length of 6 goes from 0 to 5.
    How to use Code Tags
    How to Ask Smart Questions
    The Short, Self Contained, Correct (Compilable), Example or SSCCE
    So, You Need to Write a Program but Don't Know How to Start
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  3. 03-02-2010, 11:04 AM #3
    Eranga's Avatar
    Eranga
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    Mean about this,

    Java Code: 
    			pageTitle[6] = "Albino Blacksheep";
			pageLink[6] = getURL("http://www.albinoblacksheep.com");
    with this,

    Java Code: 
    String pageTitle[] = new String[6];
		URL pageLink[] = new URL[6];
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  4. 03-02-2010, 12:20 PM #4
    pyat77
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    Smile Thank You

    I was really confused because it did not catch this error while compiling normally.
    So basically I need to add one to when I declare the arrays.
    Thank you for your help.
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  5. 03-03-2010, 04:27 AM #5
    Eranga's Avatar
    Eranga
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    In errors/exceptions basically you can found two categories, one is the compile time errors and the other one is the runtime errors. So this is a runtime error, because how can compiler knows how many items you are inserting. It's really happening when you are running the code.
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  6. 03-05-2010, 02:58 PM #6
    pyat77
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    Default Background Color

    I'm having another problem with the same code. The background color isn't changing when I change Color background = new Color(225, 0 ,0)
    I want to change it to red.
    Do I have to change something in the paint() method?
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  7. 03-06-2010, 01:12 PM #7
    Eranga's Avatar
    Eranga
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    In simple word you have to repaint the UI again.
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