java集合查询测试结果

package test.com;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.Random;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Test2 {

	  private static Random random = new Random();
	     public static void main(String[] args){
	         ArrayList<String> arraylist = new ArrayList();
	          LinkedList<String> linkedlist = new LinkedList();
	          HashMap<String,Object> map = new HashMap();
	          HashSet<String> set = new HashSet();
	          for(int i=0;i<50000;i++){
	              String r = randomString();
	              arraylist.add(r);
	              linkedlist.add(r);
	              map.put(r, r);
	              set.add(r);
	          }

	          System.out.println("arraylist size "+arraylist.size());
	          System.out.println("linkedlist size "+linkedlist.size());
	          System.out.println("map size "+map.size());
	          System.out.println("set size "+set.size());


	          System.out.println("------");
	          long begin = System.currentTimeMillis();
	          for(int j=0;j<arraylist.size();j++){
	              arraylist.contains(arraylist.get(j));
	          }
	          System.out.println("arraylist time "+(System.currentTimeMillis()-begin));


	          begin = System.currentTimeMillis();
	          for(int j=0;j<arraylist.size();j++){
	              linkedlist.contains(arraylist.get(j));
	          }
	          System.out.println("linkedlist time "+(System.currentTimeMillis()-begin));

	          begin = System.currentTimeMillis();
	          for(int i=0;i<100;i++){
	              for(int j=0;j<arraylist.size();j++){
	                 map.containsKey(arraylist.get(j));
	              }
	          }
	          System.out.println("map time "+(System.currentTimeMillis()-begin));

	          begin = System.currentTimeMillis();
	          for(int i=0;i<100;i++){
	              for(int j=0;j<arraylist.size();j++){
	                  set.contains(arraylist.get(j));
	              }
	         }
	          System.out.println("set time "+(System.currentTimeMillis()-begin));

	     }
	      protected static String randomString() {
	          return Long.toString(random.nextLong(), 36);
	      }


}

结果：
arraylist size 50000
linkedlist size 50000
map size 50000
set size 50000
------
arraylist time 52828
linkedlist time 65155
map time 678
set time 666

电脑4G内存