java中的LinkedList使用

import java.util.*;
public class TestLinkedList 
{
	public static void main(String[] args) 
	{

		LinkedList books= new LinkedList();
        books.add("His son learns fast and well");
		books.add("Good father");
		books.add("Good mother");
		books.add("Good grandfather");
		books.add("Good grandmother!");
		//System.out.println(books);
		books.addFirst("You're doing great, son!");
		//System.out.println(books);
		//Object[] str= books.toArray();
		//for(int i=0;i<str.length;i++){
		  // String book=(String)str[i];
		  // System.out.println(book);

		  // Iterator it = books.descendingIterator();
		    Iterator it = books.listIterator(0);
            while(it.hasNext()){
			  System.out.println(it.next());
			}
		}

	}

import java.util.*;
public class TestPerformance 
{
	public static void main(String[] args) 
	{
		String[] str= new String[90000];
		for(int i=0;i<str.length;i++){
		  str[i]=String.valueOf(str[i]);
		}

		ArrayList list= new ArrayList();
		for(int i=0;i<str.length;i++){
		  list.add(str[i]);
		}


		LinkedList link= new LinkedList();
		for(int i=0;i<str.length;i++){
		  link.add(str[i]);
		}

		Long strat= System.currentTimeMillis();
		for(Iterator it=list.iterator();it.hasNext();){
		    it.next();
		}
		System.out.println(strat);
		System.out.println("截代list有的时间："+(System.currentTimeMillis()-strat));
		Long linkedstrat= System.currentTimeMillis();

		for(Iterator it=link.iterator();it.hasNext();){
		    it.next();
		}
		System.out.println("截代link有的时间："+(System.currentTimeMillis()-linkedstrat));
	}
}