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readme.md

☕ Java Lesson – Thread Priority in Java

Is lesson me hum seekhenge:

  • Thread priority kya hota hai
  • Priority ka use kyun hota hai
  • setPriority() aur getPriority()
  • Priority constants
  • Real examples aur behavior

1️⃣ Thread Priority Kya Hota Hai?

Thread priority ka matlab:

thread ko execution ke liye kitni importance di gayi hai

Higher priority:

CPU scheduling me jyada chance milta hai

2️⃣ Priority Range

Java me thread priority range:

1 to 10
Constant Value
MIN_PRIORITY 1
NORM_PRIORITY 5
MAX_PRIORITY 10

3️⃣ Default Priority

har thread ki default priority = 5 (NORM_PRIORITY)

4️⃣ setPriority() Method

thread.setPriority(value);

Example:

t1.setPriority(10); // high priority
t2.setPriority(1);  // low priority

5️⃣ getPriority() Method

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

6️⃣ Basic Example

class Test extends Thread {

    public void run(){
        System.out.println(Thread.currentThread().getName() + 
                           " Priority: " + Thread.currentThread().getPriority());
    }

    public static void main(String[] args){

        Test t1 = new Test();
        Test t2 = new Test();

        t1.setPriority(Thread.MAX_PRIORITY);
        t2.setPriority(Thread.MIN_PRIORITY);

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

7️⃣ Important Note ⚠

Thread priority execution guarantee nahi deta

Matlab:

high priority thread pehle run kare ye zaruri nahi

Ye depend karta hai:

OS scheduler

8️⃣ Real-Life Analogy

Hospital me emergency patient → high priority
normal patient → low priority

9️⃣ Example – Multiple Threads

class Test extends Thread {

    public void run(){
        for(int i = 1; i <= 3; i++){
            System.out.println(Thread.currentThread().getName());
        }
    }

    public static void main(String[] args){

        Test t1 = new Test();
        Test t2 = new Test();

        t1.setPriority(8);
        t2.setPriority(3);

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

🔟 Priority Inheritance

child thread parent ki priority inherit karta hai

1️⃣1️⃣ Important Points

✔ Priority range 1–10 hoti hai
✔ default priority = 5
✔ OS scheduler decide karta hai execution
✔ priority sirf hint hota hai

1️⃣2️⃣ Common Mistakes

❌ Priority ko guaranteed execution samajhna
❌ logic ko priority par depend banana

🎯 Interview Questions

  1. Thread priority kya hota hai?
  2. MAX_PRIORITY ki value kya hoti hai?
  3. Kya priority execution guarantee karta hai?
  4. Default priority kya hoti hai?

🧾 Lesson Summary

Is lesson me humne seekha:

✔ Thread priority concept
✔ setPriority() aur getPriority()
✔ constants (MIN, MAX, NORM)
✔ real behavior

Thread priority Java me execution preference dene ke liye use hota hai, lekin ye guaranteed nahi hota.