sys-news/src/main/java/com/jkcredit/sysnews/util/CommonUtil.java

package com.jkcredit.sysnews.util;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

/**
 * @description:
 * @author: xusonglin
 * @create: 2020/3/11 10:04
 * @version: V1.0
 **/
public class CommonUtil {
    // 获取差集
    public static List<Long> getSubtraction(Set<Long> primary, Set<Long> secondary) {
        primary.removeAll(secondary);
        return new ArrayList<>(primary);
    }

    // 获取交集
    public static List<Long> getIntersection(Set<Long> primary, Set<Long> secondary) {
        primary.retainAll(secondary);
        return new ArrayList<>(primary);
    }
}