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Saturday, January 14, 2023


    Java Hello World Program

In this section we are going to learn how to write the simple java program. 

To create a simple Java program, you need to create a class that contains the main method. Let's understand the requirement first.

For executing any Java program, the following software or application must be properly installed.

  • Install the JDK if you don't have installed it, download JDK and install it.
  • Set path of the jdk/bin directory.
  • Create the Java program
  • Compile and run the Java program

Creating Hello World Java Program: 

Let's create the Hello World Program in Java 

Class Test{

public static void main (String [] args) {

System.out.println("Hello World");



Save the above file as

To compile:javac
To execute:java Simple
Output: Hello World

Parameters used in First Java Program: 

Let's see what is the meaning of class, public, static, void, main, String[], System.out.println().

  • class keyword is used to declare a class in Java.
  • public keyword is an access modifier that represents visibility. It means it is visible to all.
  • static is a keyword. If we declare any method as static, it is known as the static method. The core advantage of the static method is that there is no need to create an object to invoke the static method. The main() method is executed by the JVM, so it doesn't require creating an object to invoke the main() method. So, it saves memory.
  • void is the return type of the method. It means it doesn't return any value.
  • main represents the starting point of the program.
  • String[] args or String args[] is used for command line argument . We will discuss it in coming section.
  • System.out.println() is used to print statement. Here, System is a class, out is an object of the PrintStream class, println() is a method of the PrintStream class. We will discuss the internal working of System.out.println statement in the coming section.

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