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Home
Java
Sleeping Thread in Java

Java Sleeping Thread

To sleep a thread for a specified time, Java provides sleep method which is defined in Thread class. The sleep method is an overloaded method which are given below. It throws interrupted exception so make sure to provide proper handler.

It always pause the current thread execution. Any other thread can interrupt the current thread in sleep, in that case InterruptedException is thrown.

Syntax

sleep(long millis)throws InterruptedException
sleep(long millis, int nanos)throws InterruptedException

Example : Sleeping a thread

In this example, we are sleeping threads by using sleep method. Each thread will sleep for 1500 milliseconds and then resume its execution. See the below example.


public class MyThread extends Thread
{ 
        MyThread(String str){
            super(str);
        }
    
        public void run()
        {
                System.out.println(Thread.currentThread().getName()+" Started");
                try{
                    MyThread.sleep(1500); 
                    }catch(InterruptedException ie){
                        System.out.println(ie);
                }
                System.out.println(Thread.currentThread().getName()+" Finished");
        }
        public static void main(String[] args)
        {
                MyThread t1=new MyThread("first thread");
                MyThread t2=new MyThread("second thread");
                t1.start();
                t2.start();
        }
}

Output:

first thread Started

second thread Started

first thread Finished

second thread Finished

Example


public class MyThread extends Thread
{ 
        MyThread(String str){
            super(str);
        }
    
        public void run()
        {
                System.out.println(Thread.currentThread().getName()+" Started");
                try{
                    MyThread.sleep(1500);
                    System.out.println(Thread.currentThread().getName()+" Sleeping..");
                    }catch(InterruptedException ie){
                        System.out.println(ie);
                }
                System.out.println(Thread.currentThread().getName()+" Finished");
        }
        public static void main(String[] args)
        {
                MyThread t1=new MyThread("first thread");
                MyThread t2=new MyThread("second thread");
                System.out.println(t1.getName()+" state: "+t1.getState());
                t1.start();
                System.out.println(t1.getName()+" state: "+t1.getState());
                System.out.println(t2.getName()+" state: "+t2.getState());
                t2.start();
                System.out.println(t2.getName()+" state: "+t2.getState());
        }
}

Output:

first thread state: NEW

first thread state: RUNNABLE

second thread state: NEW

first thread Started

second thread state: RUNNABLE

second thread Started

first thread Sleeping..

second thread Sleeping..

second thread Finished

first thread Finished

Thread.sleep() interacts with the thread scheduler to put the current thread in wait state for specified period of time. Once the wait time is over, thread state is changed to runnable state and wait for the CPU for further execution. So the actual time that current thread sleep depends on the thread scheduler that is part of operating system.

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Java Sleeping Thread

Contents

Java Sleeping Thread

Syntax

Example : Sleeping a thread

Example

Java Tutorial

Recommended Handbooks

C++ Handbook

Python Basics Handbook

Javascript Handbook

ReactJS Projects Handbook

Computer Networks Tutorial

Operating System Tutorial

DBMS and SQL Tutorial

C Language Tutorial

PHP Tutorial