Calling one java program (with main method) from another

Question

Hello,
How can I start another java program from one? Lets
say I want Second.java to start by calling it from
First.java. How do I do it? The two programs are given
below. Any help is appreciated.
Thanks,
Amanda
First.java
import java.io.*;
import java.lang.reflect.*;
public class  First
     public static void main(String[] args)
          Process theProcess=null;
          System.out.println("Hello World from First.java!");
          String second=new String("Second.java");
          //System.load(second);
          //Runtime.getRuntime().load(second);
          try
               theProcess=Runtime.getRuntime().exec( "Second.java"
               System.out.println("after exec");
          catch (IOException ioe)
               System.out.println(">>IOException thrown in
First.java while calling
Second.java."+ioe.getMessage());
Second.java
public class  Second
     public static void main(String[] args)
          System.out.println("Hello World from Second.java!");
}

Answer 1

Stop posting here. The crosspost remark was to alert others that there is a duplicate topic - all answers should be centralized in one so as to not waste people's time duplicating answers when they don't see both topics and the answers therein.