#87 Thread Priority and Sleep in Java

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In this lecture we will learn:
- Thread priority in Java
- How we can suggest a priority for a thread?
- Sleep() method in thread
- Waiting state in a thread
#1
- We cannot control the schedular, we can only give suggestions to it to give priority.
- getPriority() is a method that gives the current priority of a thread.
- The range of priority goes from 1 to 10. One is the least priority whereas ten is the maximum priority.
- 5 is the default priority or normal priority. By default, every thread has a normal priority which is 5.
- We can also change the priority by using the setPriority().
- Different schedulers have different algorithms to work upon so by giving priority, we can only give suggestions to it.
- It might be possible that the scheduler gives the highest priority to the process that will execute in less time at the running phase.
#2
- We can also make a thread to wait for some time and then execute the statement further.
- Thread will wait by using the sleep() method.
- In the sleep() method, we have the pass value for how much time we want a thread to wait. The time will be in milliseconds.
- Sleep() method will throw an interrupted exception. So, we can handle an exception by using the try-catch block.
- When we use sleep(), then the thread goes into the waiting state.
- As a programmer, we can not control a thread, we can only optimise it.
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[@Charitsis]

Obviously, the goal of this short tutorial is to teach the concept of thread priority and show how Thread.sleep() works. Navin did a great job explaining those. However, if your goal is to enforce execution order between threads, you can use a binary semaphore like the code below and do not rely on elements of randomness like sleep or thread-scheduling algorithms: ------------------------------------------------------------ import java.util.concurrent.Semaphore; public class Demo { Semaphore goA = new Semaphore(1); Semaphore goB = new Semaphore(0); public static void main(String[] args) { Demo demo = new Demo(); A obj1 = demo.new A(); B obj2 = demo.new B(); obj1.start(); obj2.start(); } class A extends Thread { public void run() { for (int i = 1; i

[@The_MinecraftDude]

Oo😮

[@saqibullah7286]

very nice explanation sir keep it up

[@maleeshasandakalum6213]

Thank you sir❤❤

[@SidharthDev-nw2vc]

Brilliant.

[@user-sg4yd5in7p]

We appreciate👍

[@shashankdeep403]

We can use serializable for making it sequence?

[@justincarter360]

awesome! its hard to split de HI. and HELLO.. i couldnt but it cool!!

[@user-dv7nx6yn2k]

by ur saying at 6:50 .Sir, i've kept a time gap of 10 milli secs but still no use, hello was printed twice , many times

[@Spam-xi2nv]

Depends on how fast your computer is. It would have finished the process pretty fast. Try increasing the sleep time, just play with it .

[@TheGloriousOne0]

❤

[@ehteerk]

Wait & Try Catch

[@sakshikhaire396]

Missing Hello Aliens!!

[@Aashutosh_Bajaj]

Will this work ??? class A extends Thread{ // after extending it with thread then now it is a thread // start is a method that belongs to thread class public void run(){ // every thread will have a run method int count1 = 0; for(int i = 0; iHIGHEST PRIORITY // System.out.println("Priority (before) is: " + obj1.getPriority()); // obj1.setPriority(Thread.MAX_PRIORITY); // System.out.println("Priority (after) is: " + obj1.getPriority()); } } // If you have 4 cores then you can execute 4 threads // If you have an octaCore processor then you can execute 8 threads // Number of cores are propotional to number of threads

[@HeadSHOOTdewunzz]

I have 6-core processor and tried 7 threads but it worked, any clue why?

[@codewithmaheshhbalwan]

public class MultipleThreads { public static void main(String[] args) { printHello o = new printHello(); printHi i = new printHi(); o.start(); try { Thread.sleep(5); } catch (InterruptedException e) { e.printStackTrace(); } i.start(); } } class printHello extends Thread { public void printHello() { for (int i = 0; i < 10; i++) { System.out.println(i + " : " + "hello"); try { Thread.sleep(10); } catch (InterruptedException e) { throw new RuntimeException(e); } } } } class printHi extends Thread { public void printHi() { for (int i = 1; i < 10; i++) { System.out.println(i + " : " + "hi"); try { Thread.sleep(10); } catch (InterruptedException e) { throw new RuntimeException(e); } } } }

[@Zenetz-le4mq]

my machine is printing HIHI ns hello hello even if we apply sleep for both the Threads.