strm().filter().collect()和stream().map().collect()的作用

在看代码的时候看到了相关方法，自己在写了个例子练习一下

public class People {private Integer id;private String name;private Boolean sex;
//省略
}

public class Filter {public static void main(String[] args) {People people1 = new People(1, "Ligs", true);People people2 = new People(2, "Songzx", false);People people3 = new People(3, "Jinzg", true);People people4 = new People(4, "Liuzx", false);People people5 = new People(5, "Hedx", true);People people6 = new People(6, "Quansm", false);People people7 = new People(7, "Liangsz", true);People people8 = new People(8, "Chisz", true);ArrayList<People> list = new ArrayList<People>() {{add(people1);add(people2);add(people3);add(people4);add(people5);add(people6);add(people7);add(people8);}};System.out.println(list.stream().filter(People::getSex).collect(Collectors.toList()));//[People{id=1, name='Ligs', sex=true}, People{id=3, name='Jinzg', sex=true}, People{id=5, name='Hedx', sex=true}, People{id=7, name='Liangsz', sex=true}, People{id=8, name='Chisz', sex=true}]//过滤掉sex为false值的对象System.out.println(list.stream().map(People::getSex).collect(Collectors.toList()));//[true, false, true, false, true, false, true, true]//获取list中sex属性的集合}
}

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