Let two less associated programs run in only a jvm,is that possible?

Question

public class one{
  public static void main(){
    System.out.println("one");
public class two{
  public static void main(){
    System.out.println("two");
}let one and two run in only a jvm,is that possible?

Answer 1

Maybe the OP were asking for "JVM sharing", that would enable us to run several user programs in a single JVM instance, saving a lot of memory. I guess that there is an IBM implementation of it in z/OS.
The forthcoming J2SDK 1.5 will have the "Class Data Sharing" feature, that is not the JVM sharing feature, but it aims to reduce memory usage.
From the [url http://java.sun.com/j2se/1.5.0/docs/relnotes/features.html ]Summary of New Features and Enhancements:
[url http://java.sun.com/j2se/1.5.0/docs/guide/vm/class-data-sharing.html] Class Data Sharing
The class data sharing feature is aimed at reducing application startup time and footprint. The installation process loads a set of classes from the system jar file into a private, internal representation, then dumps that representation to a "shared archive" file. During subsequent JVM invocations, the shared archive is memory-mapped in, saving the cost of loading those classes and allowing much of the JVM's metadata for these classes to be shared among multiple JVM processes. For more information, click the above link.