It's simple,
Create a test programe on eclipse IDE.

public class NameArguments {
  public static void main(String[] args) {
    System.out.println("First Name " + args[0]);
    System.out.println("Last Name " + args[1]);
    }
}

Goto: Run->Run Configurations




in that window select Arguments tab and give the arguments(only the arguments)
Notice that there is at least one space between every two arguments.
Then just click Apply




execute the code.
output would be

First Name Pradeep
Last Name Rathnayaka