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Create a source code program in any of the text editor available like jEdit, Notepad, TextPad etc. Java program is a class with a main method in it. The main method is the starting point for every Java application. So first define the class name and lets take it as FirstProgram and write it in the text editor like below

public class FirstProgram

{
     public static void main(String[] args)
     {
          System.out.println("Ini program java paling sederhana!");
     }
} 

output di screen monitor Ini program java paling sederhana!