First code in Java

Checking Installation in VS Code Terminal

• Open VS Code terminal (it has its own built-in terminal).

• Verify installation:

  java -version
  javac -version

Creating First Java File

1. Create a file → Hello.java

   • .java is the extension for all Java source files.

JShell (Interactive Mode)

• Java also provides JShell (introduced in Java 9) for quick testing.

• Open in command prompt/terminal:

  jshell

• Try:

  2 + 3       // Output: 5
  9 - 6       // Output: 3
  print(6)    // Error
  System.out.print(6)     // Correct way
  System.out.println("Hello World") 

Compiling and Running Code

• Example code like jshell

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

• To compile:

  javac Hello.java

• Got error because for Hello.java we didnot provide complete code