9 两个list差值

Skr郎

于 2019-10-16 16:33:16 发布

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分类专栏： List

本文链接：https://blog.youkuaiyun.com/qq_31323797/article/details/102587826

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package com.gp6.list.difference;

import com.gp6.common.bean.Employee;
import com.gp6.common.utils.ListUtil;

import java.util.List;
import java.util.stream.Collectors;
import static java.util.stream.Collectors.toList

/**
* 测试list取差值
*
* @author gp6
* @date 2019/10/16
*/
public class TestDifference {
    public static void main(String[] args) {
        List<Employee> allEmployeeList = ListUtil.packEmployeeList();
        List<Employee> employeeList = ListUtil.packEmployeeList2();

        // 取差值
        List<Employee> differenceEmployeeList = allEmployeeList.stream()
                .filter(item -> !employeeList.stream()
                        .map(Employee::getId)
                        .collect(Collectors.toList())
                        .contains(item.getId()))
                .collect(Collectors.toList());
        System.out.println(differenceEmployeeList);

List<Employee> differenceEmployeeList1 = allEmployeeList .stream().filter(item -> !employeeList.contains(item)).collect(toList());
    }
}