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Java 将list日期相同的数据放到同一list下

2025-04-04 16:46:54

推荐回答（2个）

回答1：

list是一个接口你要实现功能需要用它的实现类比如ArrayList来做。里面有add方法。

你可以先把Student类的对象add到List2里面然后再找出同一日期的add到List中

回答2：

List参数只能有一个，可以用map
Map> m=new HashMap>();

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