java面试题6

12.20
一、json 的数据解析：

1.将对象（集合）转化为json字符串:

对象：
User u1 = new User(1,"tom","123456");
String js = JsonObject.ToJsonString(u1);
sout(js);

json集合：
List list = new List();
list.add(new User(2,"tony","123456"));
list.add(new User(2,"tony","123456"));
list.add(new User(2,"tony","123456"));
String js1 = JsonArray.ToJsonString(list);
sout(js1);

2.从json字符串到对象（集合）：
User us = JsonObject.parseObject(u1,User.class);
sout(us);

得到对象的集合、解析、遍历输出：
User a = JsonObject.parseObject(js1,User.class);
for(User uu:a){
sout(uu);
}

二、 增强型循环：
int [] numbers = {10, 20, 30, 40, 50};

for(int x : numbers ){
System.out.print( x );
System.out.print(",");
}

转载于:https://www.cnblogs.com/ihins/p/10594188.html