Java.lang.Thread.activeCount() Method

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Description

The java.lang.Thread.activeCount() method returns the number of active threads in the current thread's thread group.

Declaration

Following is the declaration for java.lang.Thread.activeCount() method

public static int activeCount()

Parameters

  • NA

Return Value

This method returns the number of active threads in the current thread's thread group.

Exception

  • NA

Example

The following example shows the usage of java.lang.Thread.activeCount() method.

package com.tutorialspoint;

import java.lang.*;

public class ThreadDemo {

   public static void main(String[] args) {

     Thread t = Thread.currentThread();
     t.setName("Admin Thread");
     // set thread priority to 1
     t.setPriority(1);
     
     // prints the current thread
     System.out.println("Thread = " + t);
    
     int count = Thread.activeCount();
     System.out.println("currently active threads = " + count);
    
     Thread th[] = new Thread[count];
     // returns the number of threads put into the array 
     Thread.enumerate(th);
    
     // prints active threads
     for (int i = 0; i < count; i++) {
        System.out.println(i + ": " + th[i]);
     }
   }
} 

Let us compile and run the above program, this will produce the following result:

Thread = Thread[Admin Thread,1,main]
currently active threads = 1
0: Thread[Admin Thread,1,main]



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