Get Number of Available Processors

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To display the number of processors available to a certain Java Virtual Machine there is a method of the Runtime class called availableProcessors().
To get an instance of the Runtime class we have to call the static method getRuntime(). The example below illustrates how to go about displaying the number of processors.

/**
* Main.java
*
* @author www.javadb.com
*/
public class Main {

    /**
     * Displays the number of processors available in the Java Virtual Machine
     */
    public void displayAvailableProcessors() {

        Runtime runtime = Runtime.getRuntime();

        int nrOfProcessors = runtime.availableProcessors();

        System.out.println("Number of processors available to the Java Virtual Machine: " + nrOfProcessors);

    }

    /**
     * Starts the program
     *
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        new Main().displayAvailableProcessors();
    }
}

On the machine where this example was tested the output looked like this:

Number of processors available to the Java Virtual Machine: 2

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