Java Runtime availableProcessors() Method

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Description

The Java Runtime availableProcessors() method returns the number of processors available to the Java virtual machine. This value may change during a particular invocation of the virtual machine. Applications that are sensitive to the number of available processors should therefore occasionally poll this property and adjust their resource usage appropriately.

Declaration

Following is the declaration for java.lang.Runtime.availableProcessors() method

public int availableProcessors()

Parameters

NA

Return Value

This method returns the maximum number of processors available to the virtual machine; never smaller than one

Exception

NA

Example: Getting Available Processors of Environment

The following example shows the usage of Java Runtime availableProcessors() method. We've printed the count of available Processors of the current environment using availableProcessors() method.

package com.tutorialspoint;

public class RuntimeDemo {


   public static void main(String[] args) {
  
      // print a normal message
      System.out.println("Hello world!");

      // check the number of processors available
      System.out.println(Runtime.getRuntime().availableProcessors());
   }
}

Output

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

Hello world!
32