package org.yeshi.utils;

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

public class ListUtil {
	/**
	 * 求交集
	 * 
	 * @param list1
	 * @param list2
	 * @return
	 */
	public static List<String> getIntersection(List<String> list1, List<String> list2) {
		List<String> targetList = new ArrayList<>();
		targetList.addAll(list1);
		targetList.retainAll(list2);
		return targetList;
	}

	/**
	 * 求差集
	 * 
	 * @param list1
	 * @param list2
	 * @return
	 */
	public static List<String> getDifference(List<String> list1, List<String> list2) {
		List<String> targetList = new ArrayList<>();
		if (list1.size() >= list2.size()) {
			targetList.addAll(list1);
			targetList.removeAll(list2);

		} else {
			targetList.addAll(list2);
			targetList.removeAll(list1);
		}

		return targetList;
	}
}