/*
* Copyright (c) 2013, OpenCloudDB/MyCAT and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software;Designed and Developed mainly by many Chinese
* opensource volunteers. you can redistribute it and/or modify it under the
* terms of the GNU General Public License version 2 only, as published by the
* Free Software Foundation.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Any questions about this component can be directed to it's project Web address
* https://code.google.com/p/opencloudb/.
*
*/
package org.opencloudb.util;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.UUID;
import org.junit.Assert;
/**
* @author mycat
*/
public class MapPerfMain {
public void t1() {
Map<String, Date> m = new HashMap<String, Date>();
for (int i = 0; i < 100000; i++) {
m.put(UUID.randomUUID().toString(), new Date());
}
remove1(m);
Assert.assertEquals(0, m.size());
}
public void t2() {
Map<String, Date> m = new HashMap<String, Date>();
for (int i = 0; i < 100000; i++) {
m.put(UUID.randomUUID().toString(), new Date());
}
remove2(m);
Assert.assertEquals(0, m.size());
}
void remove1(Map<String, Date> m) {
Iterator<Map.Entry<String, Date>> it = m.entrySet().iterator();
while (it.hasNext()) {
it.next().getValue();
it.remove();
}
}
void remove2(Map<String, Date> m) {
Iterator<Map.Entry<String, Date>> it = m.entrySet().iterator();
while (it.hasNext()) {
it.next().getValue();
}
m.clear();
}
}