标签:for循环 new else span time 增强 class col ext
1 对 set 的遍历
2
3 1.迭代遍历:
4 Set<String> set = new HashSet<String>();
5 Iterator<String> it = set.iterator();
6 while (it.hasNext()) {
7 String str = it.next();
8 System.out.println(str);
9 }
10
11 2.增强or循环遍历:
12 for (String str : set) {
13 System.out.println(str);
14 }
15
16
17 3.优点还体现在泛型 假如 set中存放的是Object
18
19 Set<Object> set = new HashSet<Object>();
20 for循环遍历:
21 for (Object obj: set) {
22 if(obj instanceof Integer){
23 int aa= (Integer)obj;
24 }else if(obj instanceof String){
25 String aa = (String)obj
26 }
27 ........
28 }
标签:for循环 new else span time 增强 class col ext
原文地址:https://www.cnblogs.com/aaaazzzz/p/12808130.html