Applet notinited

[Eric Kovach]

I am trying to create an applet, but at the bottom of the screen (in the status bar) it says "Applet CheckerboardPatterns notinited". I am using some examples from my textbook, but I still cannot see what I am doing wrong. Any help is appreciated.

    
 
import java.awt.*;
import javax.swing.*;
 
public class CheckerboardPatterns extends JApplet
{
enum SquareColor{red, blue};
enum Squares{Square1, Square2, Square3, Square4, Square5, Square6,
Square7, Square8};
enum Patterns{shells, diagonals};

Patterns pattern;
Patterns currentPattern;

public void init()
{
int sideSize = (int)(3 + Math.random() * 6);
//int patternType = (int)(Math.random() * 2);
int patternType = 1;
int size = sideSize * sideSize;

switch (patternType)
{
case 0:
pattern = Patterns.diagonals;
break;

case 1:
pattern = Patterns.shells;
break;
}
}

public void paint(Graphics graphics)
{
switch(pattern)
{
case diagonals:
paintDiagonals(graphics);
break;

case shells:
//paintShells(graphics);
break;
}

final int LEFT_MARGIN = 50, TOP_MARGIN = 50, X_OFFSET = 5, Y_OFFSET = 15,
NAME_INDENT = 50;

graphics.drawString("Pattern: " + currentPattern.name(), LEFT_MARGIN + NAME_INDENT, 
TOP_MARGIN - Y_OFFSET);
}

/*
private void paintShells(Graphics graphics)
{

}
*/

private void paintDiagonals(Graphics graphics)
{
String rowColNumber;

for (Squares row: Squares.values())
for (Squares col: Squares.values())
{
rowColNumber = "" + (row.ordinal() + 1) + "" + (col.ordinal() + 1);
paintSquare(graphics, row.ordinal(), col.ordinal(), rowColNumber);
}
}

private void paintSquare(Graphics graphics, int row, int col, 
String label)
{
final int SIZE = 30;
int x = (col + 1) * SIZE, y = (row + 1) * SIZE, diagonal = row + col;

switch (diagonal % 2)
{
case 0:
graphics.setColor(Color.red);
break;

case 1:
graphics.setColor(Color.blue);
break;
}
graphics.fillRect(x, y, SIZE, SIZE);
graphics.setColor(Color.white);
x += SIZE / 4;
y += SIZE / 2;
graphics.drawString(label, x, y);
}
}
 

[Ernest Friedman-Hill]

Hi,

Welcome to JavaRanch!

You can generally get more information about what went wrong by looking at the Java Console. Details of how to get to this vary depending on your OS and browser.

Just looking at the code, I see that it would require Java 1.5; perhaps you've got a Java 1.4 or earlier plugin in your browser. But that's just a guess; the Java Console would tell you for sure.

[Eric Kovach]

Thanks for the reply. Here is what the Java Console shows:

Java Plug-in 1.6.0
Using JRE version 1.6.0 Java HotSpot(TM) Client VM
User home directory = C:\Documents and Settings\Joe
----------------------------------------------------
c: clear console window
f: finalize objects on finalization queue
g: garbage collect
h: display this help message
l: dump classloader list
m: print memory usage
o: trigger logging
p: reload proxy configuration
q: hide console
r: reload policy configuration
s: dump system and deployment properties
t: dump thread list
v: dump thread stack
x: clear classloader cache
0-5: set trace level to <n>
----------------------------------------------------
load: class CheckerboardPatterns.class not found.
java.lang.ClassNotFoundException: CheckerboardPatterns.class
at sun.applet.AppletClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadCode(Unknown Source)
at sun.applet.AppletPanel.createApplet(Unknown Source)
at sun.plugin.AppletViewer.createApplet(Unknown Source)
at sun.applet.AppletPanel.runLoader(Unknown Source)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.FileNotFoundException: C:\CheckerboardPatterns\class.class (The system cannot find the path specified)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(Unknown Source)
at java.io.FileInputStream.<init>(Unknown Source)
at sun.net.www.protocol.file.FileURLConnection.connect(Unknown Source)
at sun.net.www.protocol.file.FileURLConnection.getInputStream(Unknown Source)
at sun.applet.AppletClassLoader.getBytes(Unknown Source)
at sun.applet.AppletClassLoader.access$100(Unknown Source)
at sun.applet.AppletClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 10 more

[Ernest Friedman-Hill]

OK, so there's just a little problem with your HTML file: you're using "CheckerboardPatterns.class" where you should just be using "CheckerboardPatterns" .

[Eric Kovach]

In the examples that I am using, it has "Classname.class" in the html file.

I have gone in and changed the path and classpath and now the examples that were working before are not working now. Here is what my Environment Variables look like:

End User Variables:

CLASSPATH
.;C:\java

PATH
C:\Program Files\Java\jdk1.6.0\bin;C:\java


System Variables:

CLASSPATH
.;C:\Program Files\Java\jre1.6.0\lib\ext\QTJava.zip;C:\java

Path
%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;C:\Program Files\QuickTime\QTSystem\;c:\Program Files\Microsoft SQL Server\90\Tools\binn\


Any help is appreciated.

[Eric Kovach]

OK, I have fixed my path and class path. Here�s what they are set to:
Environment Variables
User Variables
CLASSPATH=.;C:\Program Files\Java\jre1.6.0\bin;C:\java
PATH=C:\Program Files\Java\jdk1.6.0\bin

System Variables
CLASSPATH=.;C:\Program Files\Java\jre1.6.0\lib\ext\QTJava.zip
Path=%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;C:\Program Files\QuickTime\QTSystem\;c:\Program Files\Microsoft SQL Server\90\Tools\binn\;C:\Program Files\Java\jdk1.6.0\bin



At http://java.sun.com/developer/onlineTraining/new2java/ it shows an html file with the .class at the end:

<HTML>
<BODY>
<APPLET CODE=SimpleApplet.class WIDTH=200 HEIGHT=100>
 
</APPLET>
 
</BODY>
</HTML>

I took the .class out of my html file and I am still getting this in the Java Console:

Java Plug-in 1.6.0
Using JRE version 1.6.0 Java HotSpot(TM) Client VM
User home directory = C:\Documents and Settings\Joe
----------------------------------------------------
c: clear console window
f: finalize objects on finalization queue
g: garbage collect
h: display this help message
l: dump classloader list
m: print memory usage
o: trigger logging
p: reload proxy configuration
q: hide console
r: reload policy configuration
s: dump system and deployment properties
t: dump thread list
v: dump thread stack
x: clear classloader cache
0-5: set trace level to <n>
----------------------------------------------------
load: class CheckerboardPatterns not found.
java.lang.ClassNotFoundException: CheckerboardPatterns
at sun.applet.AppletClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadCode(Unknown Source)
at sun.applet.AppletPanel.createApplet(Unknown Source)
at sun.plugin.AppletViewer.createApplet(Unknown Source)
at sun.applet.AppletPanel.runLoader(Unknown Source)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.FileNotFoundException: C:\CheckerboardPatterns.class (The system cannot find the file specified)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(Unknown Source)
at java.io.FileInputStream.<init>(Unknown Source)
at sun.net.www.protocol.file.FileURLConnection.connect(Unknown Source)
at sun.net.www.protocol.file.FileURLConnection.getInputStream(Unknown Source)
at sun.applet.AppletClassLoader.getBytes(Unknown Source)
at sun.applet.AppletClassLoader.access$100(Unknown Source)
at sun.applet.AppletClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 10 more



I cannot figure out why I'm still getting the Applet CheckerboardPatterns notinited.

[Ulf Dittmer]

Is the class CheckerboardPatterns located in the same directory as the HTML file (and class SimpleApplet)?

[Eric Kovach]

Yes, class CheckerboardPatterns is located in the same directory as the HTML file. What is class SimpleApplet?

I have rewritten the program and I am having some problems with using enums, strings, and ints together in my paintDiagonals method. Am I using the right approach to number the squares diagonally moving up from left to right?

  
import java.awt.*;
import javax.swing.*;
 
public class Tester2 extends JApplet
{
//private enum PatternTypes{DIAGONALS, SHELLS};
private enum PatternTypes{DIAGONALS};
private enum Squares{Square1, Square2, Square3, Square4, Square5, Square6};
private PatternTypes patternType;
private int pattern;
private int boardSize;
private int sideSize = (int)(3 + Math.random() * 6);
private Squares r;
private Squares c;

public void init()
{
//pattern = (int)(Math.random() * 2);
pattern = (int)(Math.random() * 1);

boardSize =  sideSize * sideSize;

switch (pattern)
{
case 0:
patternType = PatternTypes.DIAGONALS;
break;

//case 1:
//patternType = PatternTypes.SHELLS;
//break;
}
}

public void paint(Graphics graphics)
{
switch(patternType)
{
case DIAGONALS:
paintDiagonals(graphics);
break;

//case SHELLS:
//paintShells(graphics);
//break;
}
}

private void paintDiagonals(Graphics graphics)// Testing diagonal
{
int diagonalNumber = 1;
String number;
int currentRow = (int)(r.ordinal() + 1);
int currentCol = (int) (c.ordinal() + 1);
int currRow = 1;
int currCol = 1;

for (Squares row: Squares.values())// for each row
for (Squares col: Squares.values())// for each column (in current row)
{
number = "" + diagonalNumber++;
//currRow = (int)currentRow;
//currCol = (int)currentCol;
paintSquare(graphics, currentRow, currentCol, number);
currentRow--;// move one square vertically up
currentCol++;// move one square horizontally to the right
}
}

/*
private void paintShells(Graphics graphics)// Change this to paint shells
{
String shellsNumber;

for (Squares row: Squares.values())// for each row
for (Squares col: Squares.values())// for each column (of current row)
{
shellsNumber = "" +(row.ordinal() + 1) + "" + (col.ordinal() + 1);
// paint square with string of (row + col) 
//     then move to next row 
paintSquare(graphics, row.ordinal(), col.ordinal(), shellsNumber);
}
}
*/
 
private void paintSquare(Graphics graphics, int row, int col, String label)
{
final int SQUARE_SIZE = 30;

int x = (col + 1) * SQUARE_SIZE;
int y = (row + 1) * SQUARE_SIZE;
int diagonal = row + col;

switch(diagonal % 2)
{
case 0:
graphics.setColor(Color.red);
break;

case 1:
graphics.setColor(Color.blue);
break;
}
graphics.fillRect(x, y, SQUARE_SIZE, SQUARE_SIZE);
graphics.setColor(Color.white);

x += SQUARE_SIZE / 4;
y += SQUARE_SIZE / 2;
graphics.drawString(label, x, y);
}
}

[Keith Lynn]

Are you trying to load it through a browser? Have you tried appletviewer?