ArrayList学习笔记一(继承关系)

图解：

源码：

public class ArrayList<E> extends AbstractList<E>
        implements List<E>, RandomAccess, Cloneable, java.io.Serializable

1 RandomAccess：随机访问

 1 public static void main(String[] args) {
 2         ArrayList<String> list = new ArrayList();
 3         for (int i = 0; i < 100000; i++) {
 4             list.add("odd Point" + i);
 5         }
 6         //随机访问
 7         long start = System.currentTimeMillis();
 8         for (int i = 0; i < list.size(); i++) {
 9             list.get(i);
10         }
11         long end = System.currentTimeMillis();
12         System.out.println("随机访问时间："+(end-start));
13 
14         //顺序访问
15         start = System.currentTimeMillis();
16         Iterator<String> iterator = list.iterator();
17         while(iterator.hasNext()){
18             iterator.next();
19         }
20         end = System.currentTimeMillis();
21         System.out.println("顺序访问时间："+(end-start));
22 }

2 Cloneable：可克隆

3 Serializable：可序列化

Computers are a sadness,I am the cure.