java怎么合并list_java 合并list的方法

1.

List reduce = list.stream()

.map(x -> x.getChildren())

.reduce(new ArrayList<>(), (all, item) -> {

all.addAll(item);

return all;

});

System.out.println(reduce);

2.

List collect = list.stream()

.map(Employee::getChildren)

.flatMap(Collection::stream)

.distinct().collect(Collectors.toList());

----------------------------

List childrens1 = new ArrayList<>();

for (long i =0;i<10;i++){

childrens1.add(new Children(i,"x".concat(i+"")));

}

List childrens2 = new ArrayList<>();

for (long i =100;i<110;i++){

childrens2.add(new Children(i,"x".concat(i+"")));

}

Employee mazi = new Employee("麻子", 90, 989.2);

mazi.setChildren(childrens1);

Employee lisi = new Employee("李四", 10, 1000.1);

lisi.setChildren(childrens2);

List list = Arrays.asList(mazi,lisi);

原文：https://www.cnblogs.com/wanjn/p/12142701.html