public class Main { public static void main(String args[]) { System.out.print("Hello World "); System.out.println("Hello Know Program"); }}

This is a simple Java program. Here's a step-by-step explanation:

1. public class Main {: This line is defining a new public class named Main. In Java, every application must contain a main class that wraps up all the code.

2. public static void main(String args[]) {: This line is defining the main method. This is the entry point for any Java application. The Java Virtual Machine (JVM) calls the main method when the program starts. The String args[] parameter is an array of String objects which contains command line arguments.

3. System.out.print("Hello World ");: This line is using the print method of System.out object to print the string "Hello World " to the console. The print method does not add a new line character at the end, so any following output will be printed on the same line.

4. System.out.println("Hello Know Program");: This line is using the println method of System.out object to print the string "Hello Know Program" to the console. The println method adds a new line character at the end, so any following output will be printed on a new line.

5. }}: These are closing braces for the main method and the Main class.

When this program is run, it will output:

Hello World Hello Know Program