JVM Default Heap Size ?

[Mark]

I am using JVM version 1.4.1 (java.vm.version=1.4.1-1) to run my
program on UNIX. I use java command line option "java" to invoke my
program.

How will I know what the default heap size settings of the JVM
(default minimum heap size and maximum heap size). Is there a way to
display the heap size settings and other properties of the JVM.

Thanks in advance,
-Mark