public static void test(){ int arr[] = {4,2,3}; for(int i : arr){ System.out.println(i); } }
下面是list
public static void test2(){ List list = new ArrayList(); list.add(1); list.add(3); list.add(4); for(Object obj : list){ int i = (Integer)obj; System.out.println(i); } }
下面是map
public void test3(){ Map map = new HashMap(); map.put(1, "aa"); map.put(2, "bb"); map.put(3, "dd"); for(Object obj : map.keySet()){ Integer k = (Integer) obj; String v = (String)map.get(k); System.out.println(k+"::"+v); } }
此方法比较适合取数据,不适合修改数据