Difference of Volumes of Cuboids in Java

The challenge

In this simple exercise, you will create a program that will take two lists of integers, a and b. Each list will consist of 3 positive integers above 0, representing the dimensions of cuboids a and b. You must find the difference of the cuboids’ volumes regardless of which is bigger.

For example, if the parameters passed are ([2, 2, 3], [5, 4, 1]), the volume of a is 12 and the volume of b is 20. Therefore, the function should return 8.

Your function will be tested with pre-made examples as well as random ones.

The solution in Java code

Option 1:

interface CuboidVolumes { static int findDifference(int[] a, int[] b) { return Math.abs(a[0] * a[1] * a[2] - b[0] * b[1] * b[2]); } }
Code language: Java (java)

Option 2:

public class CuboidVolumes { public static int findDifference(final int[] firstCuboid, final int[] secondCuboid) { int vol1 = 1, vol2 = 1; for (int i = 0; i < 3; i++) { vol1 *= firstCuboid[i]; vol2 *= secondCuboid[i]; } return Math.abs(vol1 - vol2); } }
Code language: Java (java)

Option 3:

public class CuboidVolumes { public static int findDifference(final int[] firstCuboid, final int[] secondCuboid) { if (getMulti(firstCuboid) > getMulti(secondCuboid)) return getMulti(firstCuboid) - getMulti(secondCuboid); return getMulti(secondCuboid) - getMulti(firstCuboid); } public static int getMulti(int[] arr) { int sum = 1; for (int i = 0; i < arr.length; i++) { sum *= arr[i]; } return sum; } }
Code language: Java (java)

Test cases to validate our solution

import org.junit.Test; import static org.junit.Assert.assertEquals; import org.junit.runners.JUnit4; public class SolutionTest { @Test public void sampleTestCases() { assertEquals(14, CuboidVolumes.findDifference(new int[]{3, 2, 5}, new int[]{1, 4, 4})); assertEquals(106, CuboidVolumes.findDifference(new int[]{9, 7, 2}, new int[]{5, 2, 2})); assertEquals(30, CuboidVolumes.findDifference(new int[]{11, 2, 5}, new int[]{1, 10, 8})); assertEquals(31, CuboidVolumes.findDifference(new int[]{4, 4, 7}, new int[]{3, 9, 3})); assertEquals(0, CuboidVolumes.findDifference(new int[]{15, 20, 25}, new int[]{10, 30, 25})); } }
Code language: Java (java)
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