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ZE🧵 Threads in Java – Creation + Lifecycle.
Every Java developer should understand how threads are created and how they move through different states.
Because multithreading is the foundation of high-performance backend systems.
🔹 Thread Lifecycle in Java
A thread doesn’t just start and run. It goes through multiple states:
• NEW – Thread object is created but not started
• RUNNABLE – Thread is ready or running in CPU
• BLOCKED – Waiting for a lock
• WAITING – Waiting indefinitely for another thread
• TIMED WAITING – Waiting for a specific time
• TERMINATED – Thread execution is completed
Understanding these states helps developers debug concurrency issues and optimize performance.
🔹 Ways to Create Threads in Java
There are multiple ways to create threads:
1️⃣ Extending Thread Class
2️⃣ Implementing Runnable Interface
3️⃣ Using Executor Framework (Thread Pools)
4️⃣ Using CompletableFuture for async tasks
5️⃣ Using Virtual Threads (Modern Java)
In real-world applications, developers mostly use ExecutorService or CompletableFuture for better scalability.
💡 Mastering these concepts is essential for Java interviews and backend development.
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