Java Compilation Process

title: Java Compilation Process description: Java code kaise compile aur execute hota hai

Steps

Source Code (.java) ↓ javac Compiler ↓ Bytecode (.class) ↓ JVM ↓ Machine Code ↓ Output

Step 1: Source Code Likhna

Developer .java file mein Java code likhta hai.

java exampleWoHoTech

// Hello.java
public class Hello {
    public static void main(String[] args) {
        System.out.println("Hello!");
    }
}

Step 2: Compilation

javac compiler source code ko bytecode mein convert karta hai.

bash exampleWoHoTech

javac Hello.java
# Output: Hello.class file banti hai

Step 3: Bytecode

.class file mein bytecode hota hai — platform independent intermediate code.

Step 4: JVM Execution

bash exampleWoHoTech

java Hello
# JVM .class file load karke execute karta hai

JIT Compilation

JVM mein JIT (Just-In-Time) compiler hota hai jo frequently used bytecode ko directly machine code mein convert karta hai — performance improve hoti hai.

Platform Independence Kyun?

.java → .class conversion: Platform specific nahi
.class → Machine code: JVM karta hai (har platform ka alag JVM)
Isliye same .class file Windows, Linux, Mac sab par chalti hai

title: Java Compilation Process description: Java code kaise compile aur execute hota hai

Steps

Source Code (.java) ↓ javac Compiler ↓ Bytecode (.class) ↓ JVM ↓ Machine Code ↓ Output

Step 1: Source Code Likhna

Developer .java file mein Java code likhta hai.

java exampleWoHoTech

// Hello.java
public class Hello {
    public static void main(String[] args) {
        System.out.println("Hello!");
    }
}

Step 2: Compilation

javac compiler source code ko bytecode mein convert karta hai.

bash exampleWoHoTech

javac Hello.java
# Output: Hello.class file banti hai

Step 3: Bytecode

.class file mein bytecode hota hai — platform independent intermediate code.

Step 4: JVM Execution

bash exampleWoHoTech

java Hello
# JVM .class file load karke execute karta hai

JIT Compilation

JVM mein JIT (Just-In-Time) compiler hota hai jo frequently used bytecode ko directly machine code mein convert karta hai — performance improve hoti hai.

Platform Independence Kyun?

.java → .class conversion: Platform specific nahi
.class → Machine code: JVM karta hai (har platform ka alag JVM)
Isliye same .class file Windows, Linux, Mac sab par chalti hai

Java Compilation Process

Steps

Step 1: Source Code Likhna

Step 2: Compilation

Step 3: Bytecode

Step 4: JVM Execution

JIT Compilation

Platform Independence Kyun?

Continue learning this concept

Java Compilation Process

Steps

Step 1: Source Code Likhna

Step 2: Compilation

Step 3: Bytecode

Step 4: JVM Execution

JIT Compilation

Platform Independence Kyun?

Continue learning this concept