What are the high-level thread states

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The high-level thread states are ready, running, waiting, and dead.

In Java, threads can be in various high-level states, and these states are typically represented by the Thread.State enumeration. The high-level thread states in Java are as follows:

  1. NEW: A thread that has been created but not yet started with the start() method.
  2. RUNNABLE: A thread that is ready to run is moved to the runnable state. It is waiting for its turn to be picked by the thread scheduler for execution.
  3. BLOCKED: A thread that is blocked waiting for a monitor lock is in this state. It might be waiting to enter a synchronized block/method or trying to reenter a synchronized block/method it had entered and is currently executing.
  4. WAITING: A thread that is waiting indefinitely for another thread to perform a particular action is in this state. For example, a thread that calls wait() on an object enters this state.
  5. TIMED_WAITING: A thread that is waiting for another thread to perform a particular action for up to a specified waiting time is in this state. For example, a thread that calls sleep() or join() enters this state.
  6. TERMINATED: A thread that has exited is in this state.

These states are part of the Java Thread State model and are represented by the Thread.State enum introduced in Java 5.