Multithreading Program in Java

Purpose of Multithreading

Different States of a Thread in Java

  • New: A thread whose execution has not started comes in this stage.
  • Runnable: After the start() method is called, the thread is in the queue for processing and ready to run, i.e., the thread scheduler has not selected the thread to move it to the running state. In other words, threads in this stage are waiting for the CPU for execution.
  • Running: The thread scheduler has moved the thread from runnable to this stage, which means the thread gets the CPU, and its execution is started. Note that the Runnable and Running stages form the active state of a thread.
  • Blocked/ Waiting: A thread that is still alive but is not eligible to enter the active state. A thread may enter this stage if a high-priority thread intervenes.
  • Dead/ Terminated: A thread that can no longer be used in a program. Usually, a thread enters this stage when the thread has completed its task or is forcefully terminated.

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