Java Memory Clear purgeMemory()

Description

purge Memory

License

Open Source License

Declaration

public static void purgeMemory() 

Method Source Code

//package com.java2s;
/*/*  w  w  w  .j a  v  a2  s  .c  o m*/
 * Copyright (C) 2008-2015 by Holger Arndt
 *
 * This file is part of the Universal Java Matrix Package (UJMP).
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership and licensing.
 *
 * UJMP is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * UJMP 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with UJMP; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA  02110-1301  USA
 */

public class Main {
    private static final Runtime runtime = Runtime.getRuntime();
    private static final long maxMemory = runtime.maxMemory();

    public static void purgeMemory() {
        try {
            long tmpIsFree = runtime.freeMemory();
            long tmpWasFree;
            byte[] a1 = null;
            byte[] a2 = null;
            byte[] a3 = null;
            byte[] a4 = null;
            byte[] a5 = null;
            byte[] a6 = null;
            byte[] a7 = null;
            byte[] a8 = null;
            byte[] a9 = null;
            try {
                a1 = new byte[(int) (maxMemory * 0.1)];
                a2 = new byte[(int) (maxMemory * 0.1)];
                a3 = new byte[(int) (maxMemory * 0.1)];
                a4 = new byte[(int) (maxMemory * 0.1)];
                a5 = new byte[(int) (maxMemory * 0.1)];
                a6 = new byte[(int) (maxMemory * 0.1)];
                a7 = new byte[(int) (maxMemory * 0.1)];
                a8 = new byte[(int) (maxMemory * 0.1)];
                a9 = new byte[(int) (maxMemory * 0.1)];
            } catch (Throwable t1) {
            }
            runtime.runFinalization();
            runtime.gc();
            Thread.sleep(10);
            a1 = a1 == null ? null : null;
            a2 = a2 == null ? null : null;
            a3 = a3 == null ? null : null;
            a4 = a4 == null ? null : null;
            a5 = a5 == null ? null : null;
            a6 = a6 == null ? null : null;
            a7 = a7 == null ? null : null;
            a8 = a8 == null ? null : null;
            a9 = a9 == null ? null : null;
            do {
                tmpWasFree = tmpIsFree;
                runtime.runFinalization();
                runtime.gc();
                Thread.sleep(10);
                tmpIsFree = runtime.freeMemory();
            } while (tmpIsFree > tmpWasFree);
            runtime.runFinalization();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void gc() {
        try {
            long tmpIsFree = runtime.freeMemory();
            long tmpWasFree;

            do {
                tmpWasFree = tmpIsFree;
                runtime.runFinalization();
                runtime.gc();
                Thread.sleep(10);
                tmpIsFree = runtime.freeMemory();
            } while (tmpIsFree > tmpWasFree);

            runtime.runFinalization();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Related

1. CleanMemory()
2. cleanMemory()
3. clearMemory()
4. purgeMemory()