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List.stream对多个属性值如何一次性进行分别汇总计算
我有一个对象集合,其中包含多个需要合计的属性字段。请问各位老师,如何只使用一次就可以分别统计出各维度的合计值?谢谢老师了。 单科计算使用reduce即可统计,但如果统计其他学科,需要多次重复。如何一次返回各科的汇总成绩呢?我想使用数组分别 ...
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