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

public static void main(String[] args) {
        ArrayList<String> list = new ArrayList();
        for (int i = 0; i < 100000; i++) {
            list.add("odd Point" + i);
        }
        //随机访问
        long start = System.currentTimeMillis();
        for (int i = 0; i < list.size(); i++) {
            list.get(i);
        }
        long end = System.currentTimeMillis();
        System.out.println("随机访问时间："+(end-start));

        //顺序访问
        start = System.currentTimeMillis();
        Iterator<String> iterator = list.iterator();
        while(iterator.hasNext()){
            iterator.next();
        }
        end = System.currentTimeMillis();
        System.out.println("顺序访问时间："+(end-start));
}

2 Cloneable：可克隆

3 Serializable：可序列化