Java Thread Lifecycle Explained

A thread in Java goes through multiple states during its execution. Understanding these states helps in better thread management and debugging.

1. Thread States in Java 🚦

Java threads have the following lifecycle states:

State	Description
New	Thread is created but not started.
Runnable	Thread is ready to run but waiting for CPU allocation.
Running	Thread is currently executing.
Blocked	Thread is waiting for a resource or lock.
Waiting	Thread is waiting indefinitely until notified.
Timed Waiting	Thread is waiting for a specified time.
Terminated	Thread has completed execution or stopped.

2. Real-Life Example 🌱➡️🌳

A seed (New) is planted, starts growing (Runnable), actively grows (Running), may get blocked by lack of water (Blocked), and finally withers (Terminated).

3. Thread Lifecycle Example in Java 📝

class MyThread extends Thread {
    public void run() {
        System.out.println("Thread is running...");
    }
    public static void main(String args[]) {
        MyThread t1 = new MyThread();
        System.out.println("State: " + t1.getState()); // New
        t1.start();
        System.out.println("State: " + t1.getState()); // Runnable or Running
    }
}

4. Explanation of Key Methods 🛠️

start() → Moves thread from New to Runnable.
sleep(ms) → Moves thread to Timed Waiting.
join() → Makes a thread wait until another completes.
wait() & notify() → Manage inter-thread communication.

5. Conclusion 🎯

Threads transition through multiple states based on execution flow.
Properly handling states helps in efficient multi-threaded programming.
Understanding lifecycle methods prevents deadlocks and performance issues.

By mastering thread lifecycle management, developers can create efficient Java applications! 🚀

Thread Lifecycle in Java: From Creation to Termination 🔄

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