输入数组求出乘积最大的三个数的乘积

package pandy.a;


import java.util.Scanner;

/**
 * @Author: Pandy
 * @Date: 2019/4/23 20:34
 * @Version 1.0
 * 输入一个数组求出乘积最大的三个数的乘积
 * 其中可能包括 正数 负数 0
 */
public class Test {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int len = in.nextInt();
        long[] arr = new long[len];
        for (int i = 0;i<len;i++){
            arr[i] = in.nextLong();
        }
        Long test1 = test(arr);
        System.out.println(test1);
    }

    public static Long test(long[] arr){
        long max1 = 1;
        long max2 = 1;
        long max3 = 1;
        long min1 = 1;
        long min2 = 1;
        for (long num : arr) {
            if (num > max1){
                max3 = max2;
                max2 = max1;
                max1 = num;
            }else if (num > max2){
                max3 = max2;
                max2 = num;
            }else if(num > max3){
                max3 = num;
            }

            if (num < min1){
                min2 = min1;
                min1 = num;
            }else if(num < min2){
                min2 = num;
            }
        }
        return Math.max(max1*max2*max3,min1*min2*max1);
    }
}