How do I use the sleep method of the Thread class?

By Wayan in Core API, Lang Package 0 Comment

Here is another example that use the Thread.sleep() method. In the example we create two instances of the ThreadSleepAnotherDemo, we give each thread a name and the sleep interval so that we can see how to thread execution.

package org.kodejava.lang;

import java.util.Calendar;

public class ThreadSleep implements Runnable {
    private final String threadName;
    private final long sleep;

    public ThreadSleep(String threadName, long sleep) {
        this.threadName = threadName;
        this.sleep = sleep;
    }

    public static void main(String[] args) {
        Thread thread1 = new Thread(new ThreadSleep("FirstThread", 1000));
        Thread thread2 = new Thread(new ThreadSleep("SecondThread", 3000));

        // Start the threads
        thread1.start();
        thread2.start();
    }

    // The run() method will be invoked when the thread is started.
    public void run() {
        System.out.println("Start thread [" + this.threadName + "]");
        try {
            while (true) {
                // Pause the thread for "sleep" milliseconds.
                Thread.sleep(this.sleep);
                System.out.println("[" + threadName + "]" +
                        Calendar.getInstance().getTime());
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println("Finish thread [" + this.threadName + "]");
    }
}

These are the sample output produced by the code snippet above:

Start thread [FirstThread]
Start thread [SecondThread]
[FirstThread]Mon Oct 25 11:52:13 CST 2021
[FirstThread]Mon Oct 25 11:52:14 CST 2021
[SecondThread]Mon Oct 25 11:52:15 CST 2021
[FirstThread]Mon Oct 25 11:52:15 CST 2021
[FirstThread]Mon Oct 25 11:52:16 CST 2021

How do I pause the current thread?

By Wayan in Core API, Lang Package 0 Comment

You can pause a current thread for a number of milliseconds by using the sleep() method of the Thread class. While the current thread is sleeping, it will allow other threads to execute.

package org.kodejava.lang;

public class ThreadSleepDemo implements Runnable {
    public static void main(String[] args) {
        Thread thread = new Thread(new ThreadSleepDemo());
        thread.start();
    }

    // The run() method will be invoked when the thread is started.
    public void run() {
        System.out.println("Start..");
        try {
            // Wait for 10 seconds
            Thread.sleep(10000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println("Finish...");
    }
}

How do I add a delay in my program?

By Wayan in Core API, Lang Package 0 Comment

You have a problem that you want to add a delay for a couple of seconds in your program. Using Thread.sleep() method we can add delay in our application in a millisecond time. The Thread.sleep() need to be executed inside a try-catch block, and we need to catch the InterruptedException. Let’s see the code snippet below.

package org.kodejava.lang;

public class DelayExample {
    public static void main(String[] args) {
        // This program demonstrate how to add a delay in our 
        // application.
        for (int i = 0; i < 10; i++) {
            // Print the value of i
            System.out.println("i = " + i);

            try {
                // Using Thread.sleep() we can add delay in our 
                // application in a millisecond time. For the example 
                // below the program will take a deep breath for one 
                // second before continue to print the next value of 
                // the loop.
                Thread.sleep(1000);

                // The Thread.sleep() need to be executed inside a 
                // try-catch block and we need to catch the 
                // InterruptedException.
            } catch (InterruptedException ie) {
                ie.printStackTrace();
            }
        }
    }
}