#90 Thread States in Java

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In this lecture we will learn:
- Different states of a thread
- Method used for each state of a thread
- Flow chart diagram of a thread cycle
- Difference between Runnable and Running state
#1
- Every time you create a new thread that goes into a new state.
- When you start a thread, it goes into the Runnable state.
When the thread is executing and then it is waiting for the schedular, it is in a runnable state.
- When the thread is actually running on a CPU, it is in a Running state.
The thread executes with the help of the run() method in a running state.
A thread goes in the running state only when it gets informed by the schedular to get executed.
- The thread can be held with the help of the sleep() or wait() method, then will go into the waiting state.
- With the use of notify() method, the thread goes to the Runnable state from the waiting state.
- You can stop the execution of a thread by using a stop() method, and then it will go into the Dead State.
When the work of a thread gets over, then it will go into the dead state automatically.
#2
start() notify()
New -----------} Runnable {------------
| | |
| |run() |
| | |
|Runnning ----------}Waiting
| | sleep() or wait()
| |
| |__stop()____Dead
|_______________|
stop()
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[@aileenchan3741]

This channel is the best! Thank you so much for sharing your knowledge. Today I learned about threads, multithreading, thread states... phew! : )

[@udayy4448]

This was really helpful. Thanks very much Navin!

[@dragnar4743]

So, runnable state is basically saying to the scheduler that the thread is ready for execution. That makes sense, why after sleep(), the thread goes to runnable instead of running. Because, after sleep() the thread is again gets ready for the schedular to pick it up and put it in running state.

[@animefreak6724]

When a thread calls the sleep() method, it enters a "timed waiting" state. This means the thread voluntarily gives up the CPU for at least the specified amount of time. After that time has passed, the thread moves back to the "runnable" state, indicating that it is ready to run again but is waiting for the scheduler to allocate CPU time. The reason threads don't immediately go from "runnable" to "running" after sleep() is because the scheduler still needs to determine when to allocate CPU time to that thread based on its priority, the presence of higher-priority threads, and other scheduling policies.

[@dragnar4743]

@@animefreak6724 yup, exactly

[@akashchoudhary9161]

sir you escaped the multithreading inter thread comunication concept... any reason?

[@96fan322]

I want to become a app developer, Present I know Java basics Can you tell what to learn

[@svedits7567]

basics are not enough for android development. You have to learn the features of Android Studio. How views, Layouts etc etc work. I'd recommend you take an android development course in java or kotlin

[@avisekdas-gmail5055]

Hi Navin, Can you please provide us a tutorial for executor frame work, Threadpool, Issues with Furure object and how it handled by completable future in Java 8.