Java lambda集合的相关内容

Java jdk1.8 lambda 遍历集合的时候到底需不需判空

一般情况下我们循环List 用for循环或者foreach的时候都是需要判断下集合是否是null和size是否大于0的。那么lambda遍历List 需不需要判空呢？代码： im...

Java通过Lambda表达式根据指定字段去除重复数据（集合去重）

这里博主给大家封装好了一个工具类，里面有两个方法。方法一：可以根据指定字段去除重复数据。方法二：可以获取到重复的数据。大家在使用过程中直接拷贝下方代码在要去重的类中调用即可。package com.jzmy.specialist.entity.util; import java.util.Map; ...

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java8 lambda表达式与集合类批处理操作

一、基本概念 λ表达式可以被当做是一个Object。λ表达式的类型，叫做“目标类型（target type）”。λ表达式的目标类型是“函数接口（functional interface）”，这是Java8新引入的概念。它的定义是：一个接口，如果只有一个...

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