Basic Java Class 2: First Java Program and Print Hello World

Steps to Compile and Run first Java program
Step 1) Open Notepad from Start menu by selecting Programs - Accessories - Notepad.

Step 2) Create a Source Code for your Program

Declare a class with name HelloWorld.
Declare the main method public static void main(String args[]){
Now Type the System.out.println("Hello World"); which displays the text Hello World.
class HelloWorld {
public static void main(String args[]){
System.out.println("Hello World");
}
}

Step 3) Save the file as HelloWorld.java make sure to select file type as all files while saving the file in our working folder C:\workspace

Step 4) Open the command prompt. Go to Directory C:\workspace. Compile the code using command,

javac HelloWorld.java

Step 5) If you look in your working folder, you can see that a file named HelloWorld.class has been created.

Step 6) To execute the code, enter the command java followed by the class name, as expected output Hello World is displayed now.

java HelloWorld

Note: Java is case sensitive Programming language. All code, commands, and file names should is used in consistent casing. FirstProgram is not same as firstprogram.

Step 7) If you copy and paste the same code in IDE like Eclipse the compiling and execution is done with the click of a button Using IDE is convenient and improves your efficiency but since you are learning Java, we recommend you stick to notepad.