April 2019 - WebEncyclop Tutorials

In this chapter we will see, what are different constructors and methods present in Thread class. We have already seen Runnable interface in previous chapter which has only one method declaration – run()

Thread class constructors

2.	Thread t = new Thread();
3.	Thread t = new Thread(Runnable r);
4.	Thread t = new Thread(String name);
5.	Thread t = new Thread(Runnable r, String name);
6.	Thread t = new Thread(ThreadGroup g, String name);
6.	Thread t = new Thread(ThreadGroup g, Runnable r);
7.	Thread t = new Thread(ThreadGroup g, Runnable r, String name);
8.	Thread t = new Thread(ThreadGroup g, Runnable r, String name, long stacksize);

Runnable r	target Runnable class (as explained in previous chapter)
String name	Name for new Thread that will be created using this object
ThreadGroup g	Group which will be assigned to new Thread that will be created using this object
long stacksize	Size of JVM Thread stack

Important Thread class methods other than start()

Every thread in java has some name, it may be default name generated by JVM or customized name provided by programmer.

We can get and set names of Thread by using following two methods:

public final String getName()
public final void setName()

Here is the sample example which uses common Thread methods.
You can check compilation and execution here: jDoodle

public class ThreadClassMethodsDemo {
        public static void main(String args[]) {
                // Default thread
                String threadName = Thread.currentThread().getName();
                System.out.println("Main method thread name      : " + threadName);
                // new thread
                MyThread t = new MyThread();
                threadName = t.getName();
                System.out.println("New thread name              : " + threadName);
                // set name of Thread
                Thread.currentThread().setName("webencyclop");
                threadName = Thread.currentThread().getName();
                System.out.println("Main method thread name now  : " + threadName);
        }
}

class MyThread extends Thread {
        public void run() {
                System.out.println("Child Thread");
        }
}

public class ThreadClassMethodsDemo {

public static void main(String args[]) {

// Default thread

String threadName = Thread.currentThread().getName();

System.out.println("Main method thread name : " + threadName);

// new thread

MyThread t = new MyThread();

threadName = t.getName();

System.out.println("New thread name : " + threadName);

// set name of Thread

Thread.currentThread().setName("webencyclop");

threadName = Thread.currentThread().getName();

System.out.println("Main method thread name now : " + threadName);

}

class MyThread extends Thread {

public void run() {

System.out.println("Child Thread");

}

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