ArrayList与LinkedList各操作性能比较

在数据量为50w的时候测试数据 

@Test
	public void array() {
		
		//ArrayList追加元素
		long starttime = System.currentTimeMillis();
		for (int i = 0; i < COUNT; i++) {
			arrayList.add(i);
		}
		long endtime = System.currentTimeMillis();
		System.out.println("ArrayList追加元素:"+(endtime - starttime));
		
		//初始化
		arrayList = new ArrayList();
		
		//ArrayList插入元素
		starttime = System.currentTimeMillis();
		for (int i = 0; i < COUNT; i++) {
			arrayList.add(0,i);
		}
		endtime = System.currentTimeMillis();
		System.out.println("ArrayList插入元素:"+(endtime - starttime));
		
		//for循环遍历ArrayList
		starttime = System.currentTimeMillis();
		for (int i = 0; i < COUNT; i++) {
			arrayList.get(i);
		}
		endtime = System.currentTimeMillis();
		System.out.println("for循环遍历ArrayList:"+(endtime - starttime));
		
		//迭代器遍历ArrayList
		starttime = System.currentTimeMillis();
		Iterator i1 = arrayList.iterator();
		Object obj1;
		while(i1.hasNext()) {
			obj1 = i1.next();
		}
		endtime = System.currentTimeMillis();
		System.out.println("迭代器遍历ArrayList:"+(endtime - starttime));
		
	}
	
	@Test
	public void linked() {
		//LinkedList追加元素
		long starttime = System.currentTimeMillis();
		for (int i = 0; i < COUNT; i++) {
			linkedList.add(i);
		}
		long endtime = System.currentTimeMillis();
		System.out.println("LinkedList追加元素:"+(endtime - starttime));
		
		//初始化
		linkedList = new LinkedList();
		
		//LinkedList插入元素
		starttime = System.currentTimeMillis();
		for (int i = 0; i < COUNT; i++) {
			linkedList.add(0,i);
		}
		endtime = System.currentTimeMillis();
		System.out.println("LinkedList插入元素:"+(endtime - starttime));
		
		//for循环遍历LinkedList
		starttime = System.currentTimeMillis();
		for (int i = 0; i < COUNT; i++) {
			linkedList.get(i);
		}
		endtime = System.currentTimeMillis();
		System.out.println("for循环遍历LinkedList:"+(endtime - starttime));
		
		//迭代器遍历LinkedList
		starttime = System.currentTimeMillis();
		Iterator i2 = linkedList.iterator();
		Object obj2;
		while(i2.hasNext()) {
			obj2 = i2.next();
		}
		endtime = System.currentTimeMillis();
		System.out.println("迭代器遍历LinkedList:"+(endtime - starttime));
	}
           

可以看出在进行追加（有序添加）、遍历的时候ArrayList的效率高于LinkedList，但是在无序插入的时候LinkedList效率高于ArrayList。

在做其余数据量测试的时候得出ArrayList通过for循环遍历效率要高于迭代器遍历，LinkedList迭代器遍历效率要远高于for循环遍历。