Java – Get number of available processors

java-get-number-of-processors

A code snippet to show you how to get the number of available processors / cores / CPUs in your environment.

	
	int processors = Runtime.getRuntime().availableProcessors();
	System.out.println(processors);

Output


8

P.S Tested with Intel(R) Core(TM) i7-4770 CPU @3.40GHz

2 comments on “Java – Get number of available processors

  1. /*
    * $Id: PdfNumber.java 4784 2011-03-15 08:33:00Z blowagie $
    *
    * This file is part of the iText (R) project.
    * Copyright (c) 1998-2011 1T3XT BVBA
    * Authors: Bruno Lowagie, Paulo Soares, et al.
    *
    * This program is free software; you can redistribute it and/or modify
    * it under the terms of the GNU Affero General Public License version 3
    * as published by the Free Software Foundation with the addition of the
    * following permission added to Section 15 as permitted in Section 7(a):
    * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY 1T3XT,
    * 1T3XT DISCLAIMS THE WARRANTY OF NON INFRINGEMENT OF THIRD PARTY RIGHTS.
    *
    * This program is distributed in the hope that it will be useful, but
    * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    * or FITNESS FOR A PARTICULAR PURPOSE.
    * See the GNU Affero General Public License for more details.
    * You should have received a copy of the GNU Affero General Public License
    * along with this program; if not, see http://www.gnu.org/licenses or write to
    * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    * Boston, MA, 02110-1301 USA, or download the license from the following URL:
    * http://itextpdf.com/terms-of-use/
    *
    * The interactive user interfaces in modified source and object code versions
    * of this program must display Appropriate Legal Notices, as required under
    * Section 5 of the GNU Affero General Public License.
    *
    * In accordance with Section 7(b) of the GNU Affero General Public License,
    * a covered work must retain the producer line in every PDF that is created
    * or manipulated using iText.
    *
    * You can be released from the requirements of the license by purchasing
    * a commercial license. Buying such a license is mandatory as soon as you
    * develop commercial activities involving the iText software without
    * disclosing the source code of your own applications.
    * These activities include: offering paid services to customers as an ASP,
    * serving PDFs on the fly in a web application, shipping iText with a closed
    * source product.
    *
    * For more information, please contact iText Software Corp. at this
    * address: [email protected]
    */
    package com.itextpdf.text.pdf;

    import com.itextpdf.text.error_messages.MessageLocalization;

    /**
    * PdfNumber provides two types of numbers, integer and real.
    *
    * Integers may be specified by signed or unsigned constants. Reals may only be
    * in decimal format.
    * This object is described in the ‘Portable Document Format Reference Manual
    * version 1.7’ section 3.3.2 (page 52-53).
    *
    * @see PdfObject
    * @see BadPdfFormatException
    */
    public class PdfNumber extends PdfObject {

    // CLASS VARIABLES

    /**
    * actual value of this PdfNumber, represented as a
    * double
    */
    private double value;

    // CONSTRUCTORS

    /**
    * Constructs a PdfNumber-object.
    *
    * @param content value of the new PdfNumber-object
    */
    public PdfNumber(String content) {
    super(NUMBER);
    try {
    value = Double.parseDouble(content.trim());
    setContent(content);
    }
    catch (NumberFormatException nfe){
    throw new RuntimeException(MessageLocalization.getComposedMessage(“1.is.not.a.valid.number.2”, content, nfe.toString()));
    }
    }

    /**
    * Constructs a new PdfNumber-object of type integer.
    *
    * @param value value of the new PdfNumber-object
    */
    public PdfNumber(int value) {
    super(NUMBER);
    this.value = value;
    setContent(String.valueOf(value));
    }

    /**
    * Constructs a new PdfNumber-object of type real.
    *
    * @param value value of the new PdfNumber-object
    */
    public PdfNumber(double value) {
    super(NUMBER);
    this.value = value;
    setContent(ByteBuffer.formatDouble(value));
    }

    /**
    * Constructs a new PdfNumber-object of type real.
    *
    * @param value value of the new PdfNumber-object
    */
    public PdfNumber(float value) {
    this((double)value);
    }

    // methods returning the value of this object

    /**
    * Returns the primitive int value of this object.
    *
    * @return The value as int
    */
    public int intValue() {
    return (int) value;
    }

    /**
    * Returns the primitive double value of this object.
    *
    * @return The value as double
    */
    public double doubleValue() {
    return value;
    }

    /**
    * Returns the primitive float value of this object.
    *
    * @return The value as float
    */
    public float floatValue() {
    return (float)value;
    }

    // other methods

    /**
    * Increments the value of the PdfNumber-object by 1.
    */
    public void increment() {
    value += 1.0;
    setContent(ByteBuffer.formatDouble(value));
    }
    }

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