JAVA for循环的几种用法

1         // String[] strings = {"甲", "乙", "丙", "丁"};
2         String[] strings = new String[]{"甲", "乙", "丙", "丁"};
3         for (int i = 0; i < strings.length; i++) {
4             System.out.println(strings[i]);
5         }    

1         String[] strings = new String[]{"甲", "乙", "丙", "丁"};
2         for (String str : strings) {
3             System.out.println(str);
4         }    

1         String[] strings = {"甲", "乙", "丙", "丁"};
2         Collection list = Arrays.asList(strings);
3         for (Iterator itr = list.iterator(); itr.hasNext(); ) {
4             Object str = itr.next();
5             System.out.println(str);
6         }        

1        String[] strings = {"甲", "乙", "丙", "丁"};
2         Collection list = Arrays.asList(strings);
3         for (Object string : list) {
4             System.out.println(string);
5         }