MaxProductOfThreeNumbers.java

package array;

import java.util.Arrays;

/**
 * Created by gouthamvidyapradhan on 27/06/2017.
 * Given an integer array, find three numbers whose product is maximum and output the maximum product.
 * <p>
 * Example 1:
 * Input: [1,2,3]
 * Output: 6
 * Example 2:
 * Input: [1,2,3,4]
 * Output: 24
 * Note:
 * The length of the given array will be in range [3,104] and all elements are in the range [-1000, 1000].
 * Multiplication of any three numbers in the input won't exceed the range of 32-bit signed integer.
 */
public class MaxProductOfThreeNumbers {
    public static void main(String[] args) {
        int[] A = {1, 2, 3};
        System.out.println(new MaxProductOfThreeNumbers().maximumProduct(A));
    }

    public int maximumProduct(int[] nums) {
        Arrays.sort(nums);
        int prod1 = nums[nums.length - 1] * nums[nums.length - 2] * nums[nums.length - 3];
        int prod2 = nums[nums.length - 1] * nums[0] * nums[1];
        return prod1 > prod2 ? prod1 : prod2;
    }

}