content: /*
   * Copyright 1999-2012 Alibaba Group.
   *  
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *  
   *      http://www.apache.org/licenses/LICENSE-2.0
   *  
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.alibaba.cobar.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 xianmao.hexm
   */
  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();
      }
  
  }
  