Tuesday, 29 November 2016

Program for showing Thread class methods.

The below program shows some of the method of Thread class. The minimum, normal and maximum priority of thread are 1, 5 and 10 respectively. Method with its explanation are given below:
  • static Thread currentThread( ) : Returns a reference to the currently executing thread object.
  • long getId( ) : Returns the identifier of Thread.
  • String getName( ) : Returns thread's name.
  • int getPriority( ) : Returns thread's priority.
  • Thread.State getState( ) : Returns the state of thread.
  • ThreadGroup getThreadGroup( ) : Returns the thread group to which thread belongs.
  • boolean isAlive( ) : Tests if the thread is alive.
  • boolean isDaemon( ) : Tests if the thread is a daemon thread.
  • void join(long millis) : Waits at most millis milliseconds for the thread to die.
  • void setDaemon(boolean on) : Marks thread as either a daemon thread or a user thread.
  • void setName(String name) : Changes the name of thread specified by name.
  • void setPriority(int newPriority) : Changes the priority of thread.
  • static void sleep(long millis) : Causes the currently executing thread to sleep for the specified number of milliseconds
  • static Thread currentThread() : Returns a reference to the currently executing thread object.


PROGRAM
public class ThreadMethodsDemo {

 public static void main(String[] args) {
  
  System.out.println("Thread Minimum Prority : "+Thread.MIN_PRIORITY);
  System.out.println("Thread Normal Prority : "+Thread.NORM_PRIORITY);
  System.out.println("Thread Maximum Prority : "+Thread.MAX_PRIORITY);
  Thread t = Thread.currentThread();
  System.out.println("Current Thread details : "+t.currentThread());
  t.setName("Main Thread");
  System.out.println("After changing name of main thread : "+t.currentThread());
  System.out.println("Thread ID : "+t.getId());
  System.out.println("Thread Name : "+t.getName());
  System.out.println("Thread Priority : "+t.getPriority());
  System.out.println("Thread State : "+t.getState());
  System.out.println("Thread Group : "+t.getThreadGroup());
  System.out.println("Is Daemon Thread  : "+t.isDaemon());
  t.setPriority(7); 
  // If priority greater than 10 or less than 1 then IllugalArgumentException is thrown.
  System.out.println("After changing priority it becomes : "+t.getPriority());
 }
}
OUTPUT
C:\>javac ThreadMethodsDemo.java
C:\>java ThreadMethodsDemo
Thread Minimum Prority : 1
Thread Normal Prority : 5
Thread Maximum Prority : 10
Current Thread details : Thread[main,5,main]
After changing name of main thread : Thread[Main Thread,5,main]
Thread ID : 1
Thread Name : Main Thread
Thread Priority : 5
Thread State : RUNNABLE
Thread Group : java.lang.ThreadGroup[name=main,maxpri=10]
Is Daemon Thread  : false
After changing priority it becomes : 7

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