进阶day07-Stream中的数据收集到集合
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javaSE-day07/src/com/inmind/stream03/Demo26.java
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32
javaSE-day07/src/com/inmind/stream03/Demo26.java
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package com.inmind.stream03;
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import java.util.List;
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import java.util.Set;
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import java.util.stream.Collectors;
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import java.util.stream.Stream;
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/*
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25.把Stream中的数据收集到集合
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Stream接口的一个方法collect
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R collect(Collector collector) 使用 Collector对此流的元素执行 mutable reduction操作。
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Collector:表示收集者是一个接口。它的实现类对象,我们直接使用工具类获取
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Collectors:
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toList():List集合的收集者
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toSet():Set集合的收集者
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*/
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public class Demo26 {
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public static void main(String[] args) {
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//获取流
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Stream<Integer> stream = Stream.of(1, 2, 3, 4, 5, 5, 6, 6);
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//转为List集合(数据可以重复)
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List<Integer> list = stream.collect(Collectors.toList());
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System.out.println(list);
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//转为Set集合(数据不能重复)
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Stream<Integer> stream1 = Stream.of(1, 2, 3, 4, 5, 5, 6, 6);
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Set<Integer> set = stream1.collect(Collectors.toSet());//Stream流重复
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System.out.println(set);
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}
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}
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