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readme.md

☕ Java Lesson – Thread Class in Multithreading

Is lesson me hum seekhenge:

  • Thread kya hota hai
  • Thread class kya hai
  • Thread kaise create karte hain
  • run() vs start()
  • Important methods

1️⃣ Thread Kya Hota Hai?

Thread ka matlab:

program ka ek independent execution unit

Example:

ek app me music + download + UI ek saath chalna

2️⃣ Multithreading Kya Hota Hai?

multiple threads ka parallel execution

3️⃣ Thread Class

Java me Thread class:

java.lang.Thread

Is class ko extend karke thread create karte hain.

4️⃣ Thread Create Karna (Extend Thread)

class MyThread extends Thread {

    public void run(){
        System.out.println("Thread running...");
    }

    public static void main(String[] args){

        MyThread t1 = new MyThread();

        t1.start(); // thread start
    }
}

5️⃣ run() vs start()

Method Use
run() normal method call
start() new thread create karta hai

❌ Wrong:

t1.run();

✔ Correct:

t1.start();

6️⃣ Multiple Threads Example

class MyThread extends Thread {

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

    public static void main(String[] args){

        MyThread t1 = new MyThread();
        MyThread t2 = new MyThread();

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

7️⃣ Important Thread Methods

Method Use
start() thread start
run() logic define
sleep() pause
join() wait
setPriority() priority set
getName() thread name

8️⃣ sleep() Example

try {
    Thread.sleep(1000); // 1 second
} catch(Exception e){}

9️⃣ Thread Naming

t1.setName("Worker Thread");

System.out.println(t1.getName());

🔟 Thread Lifecycle

New → Runnable → Running → Waiting → Terminated

1️⃣1️⃣ Example – Loop Thread

class MyThread extends Thread {

    public void run(){

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

    public static void main(String[] args){

        MyThread t = new MyThread();
        t.start();
    }
}

1️⃣2️⃣ Important Points

✔ Thread class extend karke thread banate hain
✔ run() me logic likhte hain
✔ start() se new thread create hota hai

🎯 Interview Questions

  1. Thread kya hota hai?
  2. run() aur start() me difference?
  3. Thread ka lifecycle kya hai?
  4. sleep() aur join() me difference?

🧾 Lesson Summary

Is lesson me humne seekha:

✔ Thread concept
✔ Thread class
✔ run() vs start()
✔ important methods
✔ lifecycle

Thread class Java me basic multithreading implementation provide karta hai.