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2024年1月11日发(作者:去掉margin属性)

group3[c][0] = (); group3[c][1] = ue(); c++; } n("()为:" + () + ",c为:" + c + ",group3数组的长度为:" + ); n("----------------------------------------------------"); for(int n = 0; n < ; n++) { n("key = " + group3[n][0] + " and value = " + group3[n][1]); }

}}多字段分组public static void main(String[] args) { User user1 = new User("zhangsan", "beijing", 10); User user2 = new User("zhangsan", "beijing", 20); User user3 = new User("lisi", "shanghai", 30); List list = new ArrayList(); (user1); (user2); (user3); Map> collect = ().collect(ngBy(e -> fetchGroupKey(e))); //{zhangsan#beijing=[User{age=10, name='zhangsan', address='beijing'}, User{age=20, name='zhangsan', address='beijing'}],

// lisi#shanghai=[User{age=30, name='lisi', address='shanghai'}]} n(collect);}

private static String fetchGroupKey(User user){ return e() +"#"+ ress();}JSONObject与对象互转//Javabean对象转换成String类型的JSON字符串String(Javabean对象)

//String类型的JSON字符串转换成Javabean对象Object(JSON字符串,)

//Json字符串转换成JSONObject对象bject(JSON字符串)

//JSON字符串转换成Javabean对象bject(JSON字符串,)

例如Refund r = new Refund();String jsonStr = String(r);

String jsonStr = "{"msg":"ZhangSan"}";Refund r = Object(jsonStr,);

JSONObject jsonObject = bject(jsonStr);

Refund r = bject(jsonStr,);


本文标签: 对象 字符串 属性