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java

Curriculum Index

Current LevelInitiate
0/ 500 XP
Gravit Certificate:
100% Required
  • 1.1 The Anatomy of a Java Program
  • 1.2 JDK vs JRE vs JVM
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Module 1: Hello Java & The JVM Engine•Lesson 1

1.1 The Anatomy of a Java Program

### The Enterprise Foundation
Java is a statically typed, class-based language compiled into platform-independent bytecode (*.class) that runs on any Java Virtual Machine (JVM).

#### Key Components:
- public class Main: Defines the top-level container matching the filename.
- public static void main(String[] args): The universal execution entry point.
- System.out.println(...): Prints data to the standard output stream with a trailing newline.

Main.javaJava 15
public class Main {
    public static void main(String[] args) {
        System.out.println("HELLO_JAVA");
    }
}
Java 15
•
Interactive Challenge
+50 XP
Challenge Objective

Execute the Java program to output 'HELLO_JAVA'.

solution.java
UTF-84 SpacesAuto-saved
openjdk-vm:~/workspace
CPython 3.11.8 (WASM)
$javac Main.java && java Main
Click "Compile & Run" (or press Ctrl + Enter) to compile AST, verify bytecode, and execute the solution.