JAVA : Life Cycle of Thread in Multithreading By Java2021

This is theory part of life cycle of thread ( Multithreading)

Thread have 4 States 

• New Thread/State
• Runnable State
• Non-Runnable State
• Dead/Terminate State

Explain one by one what happen in this states : 

New thread State : 

• A thread is in this state when the instantiation of a thread object creates a new thread but does not start it running
• A thread starts life in the ready-to-run state
• You can call only the start() or stop() when the thread is in this state.
• Calling any methods besides start() or stop() causes an illegalThreadStateException.(run time exception)

Runnable State

• When the start() method is invoked on a new thread() it get to the runnable state or running state by calling the run() methods
• A runnable thread may actually be running or may be awaiting it turn to run

Not Runnable State :  Threads are non runnable state if this four condition occur-

• A thread becomes not runnable when one of the following four events occurs
• When sleep method invoked and it sleeps  for a specified amount of time
• When suspend() method is invoked
• When the wait() method is invoked
• The thread is blocking on I/O and waits for its completion

Note : switching from not runnable state to runnable state

• if a thread has been put to sleep,then the specified number of millisecond must elapse(or it must be interrupted)
• if thread has been suspended() then its resume() method must be invoked.
• if a thread is waiting on a condition variable,whatever object owns the variable must relinquish it by calling either notify() or notifyAll().
• if a thread is blocked on I/O,then the I/O must complete.

Dead/Terminated State :  

• A thread enters this state when the run() method has finished executing or when the stop() method is invoked.
• Once in this state,the thread cannot ever run again.

Click to Next :

• - Methods of Multithreading | Join | Sleep | Notify | Notify All | Suspend | Resume

• - How to  Create a Thread in JAVA

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