废话不多说，原因不解释。上測试代码：

package com.letv.cloud.cdn.jtest;import java.io.IOException;import java.util.ArrayList;import java.util.LinkedList;import java.util.List;import java.util.concurrent.TimeUnit;import org.slf4j.LoggerFactory;import com.google.common.base.Stopwatch;public class JtestMain {		private final static org.slf4j.Logger LOGGER = LoggerFactory.getLogger("JtestMain");		private static Stopwatch stopWatch = new Stopwatch();	public static void testList(int num){		List
     
       aList = new ArrayList
      
       ();		List
       
         lList = new LinkedList
        
         ();		stopWatch.reset();		stopWatch.start();		for(int i=0; i
        
       
      
     

測试结果：

INFO [main] (JtestMain.java:65) 11:50:47,480 -- insert num:10000 ArrayList cost:2 ms INFO [main] (JtestMain.java:72) 11:50:47,484 -- insert num:10000 LinkedList cost:1 ms INFO [main] (JtestMain.java:65) 11:50:47,490 -- insert num:100000 ArrayList cost:5 ms INFO [main] (JtestMain.java:72) 11:50:47,495 -- insert num:100000 LinkedList cost:5 ms INFO [main] (JtestMain.java:65) 11:50:47,504 -- insert num:1000000 ArrayList cost:8 ms INFO [main] (JtestMain.java:72) 11:50:47,515 -- insert num:1000000 LinkedList cost:11 ms INFO [main] (JtestMain.java:65) 11:50:47,606 -- insert num:10000000 ArrayList cost:89 ms INFO [main] (JtestMain.java:72) 11:50:49,335 -- insert num:10000000 LinkedList cost:1729 ms INFO [main] (JtestMain.java:65) 11:50:50,290 -- insert num:100000000 ArrayList cost:954 ms INFO [main] (JtestMain.java:72) 11:51:14,263 -- insert num:100000000 LinkedList cost:23973 ms