Java Xmx size command??

Maybe it's stupid question, but i don't know how to use command java -Xmx<size> for my program?
I have 1Gb Ram, but when I lunch my program and it peaks about 80Mb in my memory i get an OutOfMemoryError.
How to increase this value?? (i need about 768Mb )

how to
use command java -Xmx<size> for my program?If your main class is named myClass, then the command line would be:
java -Xmx768M myClassA few notes:
If you set -Xmx to a value larger than (size of RAM - size of OS - size of other apps running) then the processes will start swapping. Since garbage collection traverses the entire java heap looking for live objects (by definition), this could start the system thrashing (continually swapping). You will get a drop in performance. So remember to allow some RAM for the OS and any other jobs you have running.
For more information, take a look at these articles:
Java HotSpot VM Options
http://java.sun.com/docs/hotspot/VMOptions.html
Tuning Garbage Collection with the 5.0 Java Virtual Machine
http://java.sun.com/docs/hotspot/gc5.0/gc_tuning_5.html
I have 1Gb Ram, but when I lunch my program and it
peaks about 80Mb in my memory i get an
OutOfMemoryError.---------------------------------------------------------------------
"Troubleshooting Guide for J2SE 5.0",
http://java.sun.com/j2se/1.5/pdf/jdk50_ts_guide.pdf

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Its running on Solaris 10 platform.The server is configured with 1Gb JVM and JRockit jrrt-4.0.0-1.6.0.
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fMemoryError -XXcompressedRefs:enable=true"
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