Help me setting up Java 1.6

Hi guys:
Well, as you can see, this is my first post in this forum.
I'm having a hard time trying to setup the user and system variables for Java SDK 1.6.
Please anyone, help me out in detail how to setup the JAVA_HOME variable so that I can start to program on java.
Until now, this is the way I'm doing it:
In the user variables, I create the JAVA_HOME variable name and the value I set up for it is: C:\Archivos de programa\Java\jdk1.6.0
For the system variables, I go to the path variable and add the following: ;%JAVA_HOME%\bin
What am I doing wrong??????
Sun's online help wasn't that helpful since it lacks details and it has some errors in the way they differentiate WinXP with Win2000.
Thanks in advance for any help.

You can run the Java 2 SDK without setting the PATH variable, or you can optionally set it as a convenience.
What you need to do is change your path variable. This is most easily done by opening an MS-DOS prompt and typing PATH to see what the path is set to currently. Then open autoexec.bat in Notepad and make the changes to PATH.
See specific instructions on this on step 5 on this page:
http://java.sun.com/j2se/1.4.2/install-windows.html

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Help with set(index, object) please / new to java

private static void setDobject(Rectangle [] setrect)
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          Rectangle myrectangle = new Rectangle(9.0,9.0);
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Enter width: 2
Enter length or 999 to exit: 1
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Enter length or 999 to exit: 10
Enter width: 20
Enter length or 999 to exit: 999
Rectangle: 3.0 by 2.0
Rectangle: 1.0 by 2.0
Rectangle: 10.0 by 20.0
Display Object with added item
Rectangle: 3.0 by 2.0
Rectangle: 1.0 by 2.0
Rectangle: 10.0 by 20.0
Rectangle: 9.0 by 9.0
Displaying Objects with SET item
Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 1, Size:
0
at java.util.LinkedList.entry(LinkedList.java:365)
at java.util.LinkedList.set(LinkedList.java:328)
at Lab11.setDobject(Lab11.java:129)
at Lab11.main(Lab11.java:78)
Press any key to continue...
finally here is the Rectangle class i'm using:
public class Rectangle
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    private double width;
    public Rectangle(double l, double w) // Constructor method
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        width = w;
    } // end Rectangle constructor
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    } // end getLength
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    } // end getWidth
    public void setLength(double l)      // setter
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    } // end setLength
     public void setWidth(double w)     // setter
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    } // end setWidth
     public double calculateArea()         // calculation method
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    } // end calculateArea
    public void displayRectangle()         // display method
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} // Rectangle ClassHope you can help guys! thanks!

LinkedList<Rectangle> rects = new LinkedList<Rectangle>();rects is an empty LinkedList at this point. It has no elements added to it.
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Hi,
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Need help in my assignment, Java programing?
It is said that there is only one natural number n such that n-1 is a square and
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plz help!!
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import javax.swing.JOptionPane;
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double n,x,y,z;
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n=Double.parseDouble(a);
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OK I'll bite.
I assume that this is some kind of assignment.
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get out a paper and pencil and think about how you would figure this out by hand.
The structure of a program will emerge from the mists.
Now that I think about it that advice must be in public domain by now.
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added additional info

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