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RunnableTest.java
RunnableTest.java
 
 
Test.java
Test.java
 
 
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readme.md

☕ Java Lesson – Runnable Interface in Multithreading

Is lesson me hum seekhenge:

  • Runnable kya hota hai
  • Runnable vs Thread class
  • Runnable ka use kyun karte hain
  • Implementation aur examples
  • Best practices

1️⃣ Runnable Kya Hota Hai?

Runnable ek interface hai:

jo thread ka task define karta hai

Package:

java.lang.Runnable

2️⃣ Runnable Ka Method

public void run();

Ye method:

thread ka actual work define karta hai

3️⃣ Runnable Ka Use Kyun?

Thread banane ke 2 tarike:

1. Thread class extend karke
2. Runnable implement karke

Runnable better hai kyunki:

✔ multiple inheritance possible hai
✔ clean design hota hai

4️⃣ Basic Example

class MyTask implements Runnable {

    public void run(){

        for(int i = 1; i <= 3; i++){
            System.out.println("Running: " + i);
        }
    }

    public static void main(String[] args){

        MyTask task = new MyTask();

        Thread t1 = new Thread(task);

        t1.start();
    }
}

5️⃣ Runnable Flow

Runnable object → Thread object → start() → run()

6️⃣ Multiple Threads Example

class MyTask implements Runnable {

    public void run(){
        System.out.println(Thread.currentThread().getName());
    }

    public static void main(String[] args){

        MyTask task = new MyTask();

        Thread t1 = new Thread(task);
        Thread t2 = new Thread(task);

        t1.start();
        t2.start();
    }
}

7️⃣ Runnable with Lambda (Modern Way)

public class Test {

    public static void main(String[] args){

        Runnable task = () -> {
            System.out.println("Thread running");
        };

        Thread t = new Thread(task);
        t.start();
    }
}

8️⃣ Runnable vs Thread

Feature Runnable Thread
Type Interface Class
Inheritance possible not possible
Flexibility high low

9️⃣ Common Mistake ⚠

❌ Direct run() call:

task.run(); // wrong

✔ Correct:

t.start();

🔟 Real-Life Example

Task define alag, execution alag

Jaise:

chef (task) + worker (thread)

1️⃣1️⃣ Important Points

✔ Runnable preferred approach hai
✔ run() method me logic likhte hain
✔ Thread object se execute hota hai

🎯 Interview Questions

  1. Runnable kya hota hai?
  2. Runnable aur Thread me difference?
  3. run() aur start() me difference?
  4. Runnable better kyun hai?

🧾 Lesson Summary

Is lesson me humne seekha:

✔ Runnable interface
✔ Thread creation using Runnable
✔ Lambda usage
✔ Runnable vs Thread

Runnable Java me clean aur flexible multithreading approach provide karta hai.