[List]——两种遍历方式

public class Test {public static void main(String[] args) {List list =new ArrayList();list.add("aaa");list.add("bbb");list.add("ccc");//通过索引遍历for (int i = 0; i < list.size(); i++) {System.out.print(list.get(i)+ "    ");}System.out.println();Set set=new HashSet();set.add("高一");set.add("高二");set.add("高三");//通过迭代器遍历for (Iterator iter2=set.iterator();iter2.hasNext();) {String str=(String)iter2.next();System.out.print(str+"     ");}System.out.println();for (Iterator iter=set.iterator();iter.hasNext();) {String str=(String)iter.next();System.out.print(str+"  ");}}}