Java jdk8实现 部门树的递归编写

package com.otc.infra.utils;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
public class Department {
private Integer id;
private String name;
private Integer parentId;
private List<Department> children = new ArrayList<>();
public Department(Integer id, String name, Integer parentId) {
this.id = id;
this.name = name;
this.parentId = parentId;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getParentId() {
return parentId;
}
public void setParentId(Integer parentId) {
this.parentId = parentId;
}
public List<Department> getChildren() {
return children;
}
public void setChildren(List<Department> children) {
this.children = children;
}
public static void main(String[] args) {
List<Department> departmentList = new ArrayList<>();
departmentList.add(new Department(1, "白胡子", null));
departmentList.add(new Department(2, "不死鸟", 1));
departmentList.add(new Department(3, "艾斯", 1));
departmentList.add(new Department(4, "龙", null));
departmentList.add(new Department(5, "路飞", 4));
departmentList.add(new Department(6, "索隆", 5));
departmentList.add(new Department(7, "娜美", 5));
departmentList.add(new Department(8, "罗宾", 5));
departmentList.add(new Department(9, "乌索普", 5));
departmentList.add(new Department(10, "小丑", 100));//小丑的长官Id不存在，所以tree中没有它的信息
List<Department> tree = makeTree(departmentList, null);
System.out.println("-------------------------->");
}
private static List<Department> makeTree(List<Department> departmentList, Integer pId) {
//子类
List<Department> children = departmentList.stream().filter(x -> x.getParentId() == pId).collect(Collectors.toList());
//后辈中的非子类
List<Department> successor = departmentList.stream().filter(x -> x.getParentId() != pId).collect(Collectors.toList());
children.forEach(x ->
{
makeTree(successor, x.getId()).forEach(
y -> x.getChildren().add(y)
);
}
);
return children;
}
}

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