Langton's Ant - understanding Boolean[][]

hello! I got my hands on this code, but I need some help understanding it.
what does "[][]" after a booelan value do? I have googled it and looked for it beneath boolean @ API but can't find an answer.
here is the code:
import java.awt.*;
public class LangtonsMyra extends java.applet.Applet implements Runnable {
 int x=400, y=300;
 int direction= 0;
 boolean[][] isBlack= new boolean[800][600];
 Image image;
 public void init(){
 setSize( 800,600);
 image= createImage( 800,600);
 public void start(){
 Thread t= new Thread( this);
 t.start();
 public void run(){
 int ix= 100;
 while( true){
 isBlack[x][y]= !isBlack[x][y];
 if( isBlack[x][y]){
 direction++;
 if( direction == 4) direction = 0;
 } else {
 direction--;
 if( direction == -1) direction = 3;
 if( direction == 0) x++;
 if( direction == 1) y++;
 if( direction == 2) x--;
 if( direction == 3) y--;
 if( x == -1) x= 799;
 if( y == -1) y= 599;
 if( x == 800) x= 0;
 if( y == 600) y= 0;
 if( --ix == 0){
 ix= 100;
 repaint();
 try{ Thread.sleep(1);} catch( Exception e){}
 public void update( Graphics g){
 paint( image.getGraphics() );
 g.drawImage( image, 0,0, null);
 public void paint( Graphics g){
 for( int x=0; x<800; x++){
 for( int y=0; y<600; y++){
 if( isBlack[x][y]){
 g.setColor( Color.BLACK);
 } else {
 g.setColor( Color.WHITE);
 g.fillRect(x,y, 1,1);
 g.setColor( Color.RED);
 g.fillRect(x*4,y*4, 4,4);
}Thanks in advance.
Edited by: uj2n on Aug 21, 2009 12:49 AM

do you mean the two dimensional array of boolean??I don't understand how the boolean value(s?) isBlack work in this applet. can someone please explain this or link a good howto? I have been googling for arrays for a few days, but can't really understand how this works.
Thanks in advance

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Class org.apache.tools.ant.taskdefs.Java loaded from parent loader (parentFirst)
Class weblogic.ant.taskdefs.management.WLSTTask loaded from ant loader (parentFirst)
Class java.lang.Object loaded from parent loader (parentFirst)
Class java.lang.Throwable loaded from parent loader (parentFirst)
Class org.apache.tools.ant.BuildException loaded from parent loader (parentFirst)
Class java.lang.Exception loaded from parent loader (parentFirst)
Class java.lang.IllegalStateException loaded from parent loader (parentFirst)
Class java.io.Reader loaded from parent loader (parentFirst)
Class java.io.StringReader loaded from parent loader (parentFirst)
Class java.lang.String loaded from parent loader (parentFirst)
Class java.io.IOException loaded from parent loader (parentFirst)
Class java.io.OutputStream loaded from parent loader (parentFirst)
Class java.io.FileOutputStream loaded from parent loader (parentFirst)
+Datatype wlst weblogic.ant.taskdefs.management.WLSTTask
Setting ro project property: ant.project.invoked-targets -> run
Attempting to create object of type org.apache.tools.ant.helper.DefaultExecutor
Adding reference: ant.executor
Build sequence for target(s) `run' is [connect, run]
Complete build sequence is [connect, run, ]
connect:
[echo] WebLogic Home is : D:\SYS\Weblogic1034\wlserver_10.3
Class org.apache.tools.ant.types.Path loaded from parent loader (parentFirst)
Finding class weblogic.ant.taskdefs.management.WLSTScript
Loaded from D:\SYS\Weblogic1034\wlserver_10.3\server\lib\weblogic.jar weblogic/ant/taskdefs/management/WLSTScript.class
Class org.apache.tools.ant.Task loaded from parent loader (parentFirst)
Class weblogic.ant.taskdefs.management.WLSTScript loaded from ant loader (parentFirst)
Class java.lang.Boolean loaded from parent loader (parentFirst)
Class java.lang.StringBuilder loaded from parent loader (parentFirst)
Class org.apache.tools.ant.types.Commandline$Argument loaded from parent loader (parentFirst)
Class org.apache.tools.ant.util.FileUtils loaded from parent loader (parentFirst)
Class java.io.PrintWriter loaded from parent loader (parentFirst)
Class java.io.LineNumberReader loaded from parent loader (parentFirst)
Finding class weblogic.utils.StringUtils
Loaded from D:\SYS\Weblogic1034\modules\com.bea.core.utils_1.9.0.0.jar weblogic/utils/StringUtils.class
Class weblogic.utils.StringUtils loaded from ant loader (parentFirst)
Class java.lang.SecurityException loaded from parent loader (parentFirst)
Class java.lang.NoSuchMethodException loaded from parent loader (parentFirst)
Finding class weblogic.utils.StringUtils$StringMaker
Loaded from D:\SYS\Weblogic1034\modules\com.bea.core.utils_1.9.0.0.jar weblogic/utils/StringUtils$StringMaker.class
Class weblogic.utils.StringUtils$StringMaker loaded from ant loader (parentFirst)
Finding class weblogic.utils.StringUtils$ReflectedStringMaker
Loaded from D:\SYS\Weblogic1034\modules\com.bea.core.utils_1.9.0.0.jar weblogic/utils/StringUtils$ReflectedStringMaker.class
Class weblogic.utils.StringUtils$ReflectedStringMaker loaded from ant loader (parentFirst)
Class java.lang.Class loaded from parent loader (parentFirst)
Class java.lang.Integer loaded from parent loader (parentFirst)
Class java.lang.reflect.Constructor loaded from parent loader (parentFirst)
Class java.lang.reflect.InvocationTargetException loaded from parent loader (parentFirst)
Class java.lang.IllegalAccessException loaded from parent loader (parentFirst)
Class java.lang.InstantiationException loaded from parent loader (parentFirst)
Class java.lang.RuntimeException loaded from parent loader (parentFirst)
Class java.lang.Character loaded from parent loader (parentFirst)
Class java.io.File loaded from parent loader (parentFirst)
Class org.apache.tools.ant.types.CommandlineJava loaded from parent loader (parentFirst)
[wlst] Executing 'D:\SYS\JAVA\jdk1.6.0_21\jre\bin\java.exe' with arguments:
[wlst] '-Ddebug=false'
[wlst] '-DfailOnError=true'
[wlst] '-DexecuteScriptBeforeFile=true'
[wlst] '-DscriptTempFile=C:\Users\Administrator\AppData\Local\Temp\2\wlsttempfile214271013.py'
[wlst] '-classpath'
[wlst] 'D:\SYS\apache-ant-1.8.0\lib\ant-launcher.jar;D:\SYS\apache-ant-1.8.0\lib\ant-antlr.jar;D:\SYS\apache-ant-1.8.0\lib\ant-apache-bcel.jar;D:\SYS\apache-ant-1.8.0\lib\ant-apache-bsf.jar;D:\SYS\apache-ant-1.8.0\lib\ant-apache-log4j.jar;D:\SYS\apache-ant-1.8.0\lib\ant-apache-oro.jar;D:\SYS\apache-ant-1.8.0\lib\ant-apache-regexp.jar;D:\SYS\apache-ant-1.8.0\lib\ant-apache-resolver.jar;D:\SYS\apache-ant-1.8.0\lib\ant-apache-xalan2.jar;D:\SYS\apache-ant-1.8.0\lib\ant-commons-logging.jar;D:\SYS\apache-ant-1.8.0\lib\ant-commons-net.jar;D:\SYS\apache-ant-1.8.0\lib\ant-jai.jar;D:\SYS\apache-ant-1.8.0\lib\ant-javamail.jar;D:\SYS\apache-ant-1.8.0\lib\ant-jdepend.jar;D:\SYS\apache-ant-1.8.0\lib\ant-jmf.jar;D:\SYS\apache-ant-1.8.0\lib\ant-jsch.jar;D:\SYS\apache-ant-1.8.0\lib\ant-junit.jar;D:\SYS\apache-ant-1.8.0\lib\ant-netrexx.jar;D:\SYS\apache-ant-1.8.0\lib\ant-nodeps.jar;D:\SYS\apache-ant-1.8.0\lib\ant-stylebook.jar;D:\SYS\apache-ant-1.8.0\lib\ant-swing.jar;D:\SYS\apache-ant-1.8.0\lib\ant-testutil.jar;D:\SYS\apache-ant-1.8.0\lib\ant-trax.jar;D:\SYS\apache-ant-1.8.0\lib\ant.jar;D:\SYS\apache-ant-1.8.0\lib\xercesImpl.jar;D:\SYS\apache-ant-1.8.0\lib\xml-apis.jar;D:\SYS\JAVA\jdk1.6.0_21\lib\tools.jar'
[wlst] 'weblogic.management.scripting.WLSTInterpreterInvoker'
[wlst]
[wlst] The ' characters around the executable and arguments are
[wlst] not part of the command.
[wlst] Using input " "
Execute:Java13CommandLauncher: Executing 'D:\SYS\JAVA\jdk1.6.0_21\jre\bin\java.exe' with arguments:
'-Ddebug=false'
'-DfailOnError=true'
'-DexecuteScriptBeforeFile=true'
'-DscriptTempFile=C:\Users\Administrator\AppData\Local\Temp\2\wlsttempfile214271013.py'
'-classpath'
'D:\SYS\apache-ant-1.8.0\lib\ant-launcher.jar;D:\SYS\apache-ant-1.8.0\lib\ant-antlr.jar;D:\SYS\apache-ant-1.8.0\lib\ant-apache-bcel.jar;D:\SYS\apache-ant-1.8.0\lib\ant-apache-bsf.jar;D:\SYS\apache-ant-1.8.0\lib\ant-apache-log4j.jar;D:\SYS\apache-ant-1.8.0\lib\ant-apache-oro.jar;D:\SYS\apache-ant-1.8.0\lib\ant-apache-regexp.jar;D:\SYS\apache-ant-1.8.0\lib\ant-apache-resolver.jar;D:\SYS\apache-ant-1.8.0\lib\ant-apache-xalan2.jar;D:\SYS\apache-ant-1.8.0\lib\ant-commons-logging.jar;D:\SYS\apache-ant-1.8.0\lib\ant-commons-net.jar;D:\SYS\apache-ant-1.8.0\lib\ant-jai.jar;D:\SYS\apache-ant-1.8.0\lib\ant-javamail.jar;D:\SYS\apache-ant-1.8.0\lib\ant-jdepend.jar;D:\SYS\apache-ant-1.8.0\lib\ant-jmf.jar;D:\SYS\apache-ant-1.8.0\lib\ant-jsch.jar;D:\SYS\apache-ant-1.8.0\lib\ant-junit.jar;D:\SYS\apache-ant-1.8.0\lib\ant-netrexx.jar;D:\SYS\apache-ant-1.8.0\lib\ant-nodeps.jar;D:\SYS\apache-ant-1.8.0\lib\ant-stylebook.jar;D:\SYS\apache-ant-1.8.0\lib\ant-swing.jar;D:\SYS\apache-ant-1.8.0\lib\ant-testutil.jar;D:\SYS\apache-ant-1.8.0\lib\ant-trax.jar;D:\SYS\apache-ant-1.8.0\lib\ant.jar;D:\SYS\apache-ant-1.8.0\lib\xercesImpl.jar;D:\SYS\apache-ant-1.8.0\lib\xml-apis.jar;D:\SYS\JAVA\jdk1.6.0_21\lib\tools.jar'
'weblogic.management.scripting.WLSTInterpreterInvoker'
The ' characters around the executable and arguments are
not part of the command.
[wlst] java.lang.NoClassDefFoundError: weblogic/management/scripting/WLSTInterpreterInvoker
[wlst] Caused by: java.lang.ClassNotFoundException: weblogic.management.scripting.WLSTInterpreterInvoker
[wlst] at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
[wlst] at java.security.AccessController.doPrivileged(Native Method)
[wlst] at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
[wlst] at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
[wlst] at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
[wlst] at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
[wlst] Could not find the main class: weblogic.management.scripting.WLSTInterpreterInvoker. Program will exit.
[wlst] Exception in thread "main"

If statement in Ant

Hi,
Does anyone tell me how to make "if" statement in Ant? I'd like to execute some target if certain conditions are satisfied. <condition> or <available> just sets property values and cannot be "if" statement.
Let's say, if a property "flag" is true, then I'd like to execute a target called "target1". How can I do this?
thanks,
-tom

most tasks or targets have the ability to check the existence or non-existence of properties. The actual value of a property is not used, its existence is checked.
The condition task can be used to bring a property in existence under certain conditions.
Other than that I suggest looking at the ant documentation, it is pretty comprehensive and not hard to understand.

Problem with getAttribute() for Booleans

Hi
We have an Application which has undergone all the migration path from JDeveloper 9i beta up to JDeveloper 9.0.5.2 (in several steps certainly :-) ) . Now we try do the next step: we want to upgrade from 9.0.5.2 to 10.1.3.
But there is a problem with Boolean attributes:
Since there were some problems with Booleans in elder versions of JDeveloper all our Booleans are stored in Attributes of type VARCHAR2(1) ("1" is TRUE, "0" is FALSE). This worked well since 9.0.5.2. But now in JDeveloper 10.1.3 all Boolean Attributes return FALSE, no matter of the content of the database. Since we do not want to convert our data in the database I am now looking for a way, how I can enable this Application to correctly read Booleans from VARCHAR2(1) .
I've already found some classes like "TypeFactory" and "TypeMapEntries", and I've found the Property "jbo.TypeMapEntries". But I've found no clue, how to use them for my problem.
Can anyone give me a hint?
Thanks in advance
Frank Brandstetter

You have several problems:
1. On-Insert will ONLY run if you have created a new record in a base-table block. If you haven't done that, then the POST command will not cause it to run.
2. Select for update without a "no wait" will lock records for the first form, but when the second form tries this, it will hit the ORA-00054 exception, and will NOT wait. The only way you could make it wait is to issue an UPDATE sql command, which is not such a good way to go.
All POST does is issues SQL insert or update commands for any changes the user has made to records in a form's base-table blocks, without following with a Commit command.
Also understand that Commit is the same as Commit_Form, and Rollback is the same as Clear_Form. You should read up on these in the Forms help topics.

Langton's Ant - understanding Boolean[][]

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