问题：存在两个序列，相互交换两个序列中的一个元素后，两序列的和相等

import java.math.BigDecimal;
import java.util.*;

/**
 * @name: Exchange
 * @description: 问题：存在两个序列，相互交换两个序列中的一个元素后，两序列的和相等
 *  思路：1.分别求出两个序列的和
 *       2.判断是否存在满足（第一个序列和-2*遍历元素值 == 第二个序列和-2*遍历元素值）条件的项
 *       3.如果存在2中的项，则交换该两项即可完成
 * 
 * @version: v1.0
 * @create: 2021-01-30 09:33
 **/

public class Exchange {

    public static void main(String[] args) {

        Map<Integer,Integer> ones = new HashMap<>();
        Map<Integer,Integer> twos = new HashMap<>();

        Scanner scanner = new Scanner(System.in);
        System.out.println("Input the number of fisrt values");
        int oneNum = scanner.nextInt();
        System.out.println("Input the number of  values");
        for(int i=0;i<oneNum;i++){
            ones.put(i, scanner.nextInt());
        }

        System.out.println("Input the number of second values");
        int secondNum = scanner.nextInt();
        System.out.println("Input the number of  values");
        for(int i=0;i<secondNum;i++){
            twos.put(i, scanner.nextInt());
        }

        Integer sunOne = ones.values().stream().reduce(Integer::sum).get();
        System.out.println("the fisrt list sum:" + sunOne);

        Integer sunTwo = twos.values().stream().reduce(Integer::sum).get();
        System.out.println("the fisrt second sum:" + sunTwo);

        boolean isExit = false;
        Set<Map.Entry<Integer, Integer>> oneEntries = ones.entrySet();
        Set<Map.Entry<Integer, Integer>> twoEntries = twos.entrySet();

        for(Map.Entry<Integer, Integer> oneSet : oneEntries){
            for(Map.Entry<Integer, Integer> twoSet : twoEntries){
                if (sunOne - 2 * oneSet.getValue() == sunTwo - 2 * twoSet.getValue()) {
                    System.out.println("exit:" + oneSet.getValue() + "  " + twoSet.getValue());
                    isExit = true;
                    Integer tmp = twoSet.getValue();
                    twoSet.setValue(oneSet.getValue());
                    oneSet.setValue(tmp);
                    break;
                }
            }
            if (isExit) {
                break;
            }
        }

        ones.values().forEach(System.out::print);
        System.out.println();
        Integer sunOne1 = ones.values().stream().reduce(Integer::sum).get();
        System.out.println("the fisrt list sum:" + sunOne1);


        twos.values().forEach(System.out::print);
        System.out.println();
        Integer sunTwo1 = twos.values().stream().reduce(Integer::sum).get();
        System.out.println("the second list sum:" + sunTwo1);

        if (isExit) {
            System.out.println("yes");
        }else {
            System.out.println("no");
        }
    }
}