下面是我写的获取最大序列的方法，最终值是对的，但是中间有几条语句执行有问题

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;

public class MaxList {
    public static void main(String[] args) {
        int[] array = new int[]{-1,2,3,4,-5,6,7};
        maxlist(array);
    }
    public static ArrayList<Integer> maxlist(int[] array) {
        ArrayList<Integer> max = new ArrayList<>();//用于接收最大序列
        ArrayList<Integer> receive = new ArrayList<>();//用于接收所有最大序列的和
        HashMap<Integer, ArrayList<Integer>> hash = new HashMap<>();//用于存储返回的序列和它的索引值
        if (array.length == 0)
            return null;
        else if (array.length == 1) {
            max.add(array[0]);
            System.out.println(max);
            return max;

        }
            max.add(array[0]);
            receive.add(Sum(max));

            for (int i = 1; i < array.length; i++) {
                if (Sum(max) > 0) {
                    max.add(array[i]);
                    System.out.println(Sum(max));
                    receive.add(Sum(max));//如果前面的序列大于0，那么添加后面的一个数组元素并且存储当前集合的和
                    System.out.println(receive);
                    System.out.println(max);
                    hash.put(Sum(max), max);
                    System.out.println(hash); //执行结果是：
                }

                else if (Sum(max) <= 0) {
                    //max.add(array[i]);

                    //System.out.println(max);
                    max.clear();
                    receive.clear();
                    max.add(array[i]);
                    //System.out.println("max:" + max);
                    receive.add(array[i]);//如果前面的序列小于等于0，那么直接将当前数组的值作为receive的元素
                    //System.out.println(receive);
                    hash.put(array[i], max);
                    System.out.println(hash);
                    System.out.println("=======================");
                }

            }
            System.out.println("=======================");
            //Collections.sort(receive);
            //System.out.println(receive);
            System.out.println(hash);
            //System.out.println(receive.size());
            System.out.println(hash.get(receive.get(receive.size() - 1 )));//求出最大序列
            return hash.get(receive.get(receive.size() - 1));


    }

    public static int Sum(ArrayList<Integer> array){
        int sum = 0;
        for (int i = 0; i < array.size(); i++) {
            sum += array.get(i);
        }
        return sum;
    }
}