LinkedList 的所有遍历方式

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package com.nine;import java.util.Iterator;import java.util.LinkedList;public class Test {    public static void main(String[] args) {        LinkedList linkedList = new LinkedList();        linkedList.add("12");        linkedList.add("34");        System.out.println(linkedList);        Iterator iterator = linkedList.iterator();        while (iterator.hasNext()) {            System.out.println(iterator.next());        }        System.out.println("--------------");        for (int i = 0; i < linkedList.size(); i++) {            System.out.println(linkedList.get(i));        }        System.out.println("--------------");        for (Object object : linkedList) {            System.out.println(object);        }        System.out.println("--------------");        while (linkedList.size() != 0) {            System.out.println(linkedList.pollFirst());        }        System.out.println("--------------");        LinkedList linkedList2 = new LinkedList();        linkedList2.add("12");        linkedList2.add("34");        while (linkedList2.size() != 0) {            System.out.println(linkedList2.pollLast());  // 相当于倒叙输出；         }        System.out.println("--------------");        LinkedList linkedList3 = new LinkedList();        linkedList3.add("12");        linkedList3.add("34");        while (linkedList3.size() != 0) {            System.out.println(linkedList3.removeLast());  // 相当于倒叙输出；         }        double   b =  System.currentTimeMillis();         System.out.println("--------------");        LinkedList linkedList4 = new LinkedList();        linkedList4.add("12");        linkedList4.add("34");        while (linkedList4.size() != 0) {            System.out.println(linkedList4.removeFirst());  // 相当于正序叙输出；         }        double   a = System.currentTimeMillis();         System.out.println(a-b);   //  1 毫秒；     }}
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