java集合操作

package note;

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

/***
 * 集合运算： 1、并集（or） 2、交集（and） 3、差集（not） 4、无重复的并集
 * */
public class SetOperation {

	// 并集
	public static ArrayList get_orSet(ArrayList dataList1, ArrayList dataList2) {
		ArrayList dataListCopy1 = new ArrayList();
		dataListCopy1 = (ArrayList) dataList1.clone();
		ArrayList dataListCopy2 = new ArrayList();
		dataListCopy2 = (ArrayList) dataList2.clone();
		dataListCopy1.addAll(dataListCopy2);
		return dataListCopy1;
	}

	// 交集
	public static ArrayList get_andSet(ArrayList dataList1, ArrayList dataList2) {
		ArrayList dataListCopy1 = new ArrayList();
		dataListCopy1 = (ArrayList) dataList1.clone();
		ArrayList dataListCopy2 = new ArrayList();
		dataListCopy2 = (ArrayList) dataList2.clone();
		// retainAll方法会删除dataListCopy1中没有出现在dataListCopy2中的元素
		dataListCopy1.retainAll(dataListCopy2);
		return dataListCopy1;
	}

	// 差集
	public static ArrayList get_notSet(ArrayList dataList1, ArrayList dataList2) {
		ArrayList dataListCopy1 = new ArrayList();
		dataListCopy1 = (ArrayList) dataList1.clone();
		ArrayList dataListCopy2 = new ArrayList();
		dataListCopy2 = (ArrayList) dataList2.clone();
		dataListCopy1.removeAll(dataListCopy2);
		return dataListCopy1;
	}

	// 无重复并集（注意：不能用HashSet实现）
	public static ArrayList get_onlyorSet(ArrayList dataList1,
			ArrayList dataList2) {
		ArrayList dataListCopy1 = new ArrayList();
		dataListCopy1 = (ArrayList) dataList1.clone();
		ArrayList dataListCopy2 = new ArrayList();
		dataListCopy2 = (ArrayList) dataList2.clone();
		dataListCopy2.removeAll(dataListCopy1);
		dataListCopy1.add(dataListCopy2);
		return dataListCopy1;
	}

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		ArrayList dataList1 = new ArrayList();
		ArrayList dataList2 = new ArrayList();

		dataList1.add(1);
		dataList1.add(8);
		dataList1.add(3);
		dataList1.add(4);
		dataList1.add(4);
		dataList1.add(3);

		dataList2.add(1);
		dataList2.add(3);
		dataList2.add(4);
		dataList2.add(5);
		dataList2.add(6);
		dataList2.add(5);
		dataList2.add(2);
		List bingji, jiaoji, chaji, wuchongfu_bingji;
		bingji = SetOperation.get_orSet(dataList1, dataList2);
		jiaoji = SetOperation.get_andSet(dataList1, dataList2);
		chaji = SetOperation.get_notSet(dataList1, dataList2);
		wuchongfu_bingji = SetOperation.get_onlyorSet(dataList1, dataList2);
		// 原集合1
		System.out.println("原集合1：" + dataList1);
		// 原集合2
		System.out.println("原集合2：" + dataList2);
		// 并集
		System.out.println("并集：" + bingji);
		// 交集
		System.out.println("交集：" + jiaoji);
		// 差集
		System.out.println("差集：" + chaji);
		// 无重复并集
		System.out.print("无重复并集：" + wuchongfu_bingji);
	}
}

 

错误处，请指出，谢谢！