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+package theweeklychallenge;
+
+/*
+
+Week 145:
+
+    https://theweeklychallenge.org/blog/perl-weekly-challenge-145
+
+Task #1: Dot Product
+
+    You are given 2 arrays of same size, @a and @b.
+
+    Write a script to implement Dot Product.
+
+*/
+
+import junit.framework.TestCase;
+import static junit.framework.Assert.*;
+
+public class DotProduct extends TestCase {
+
+    public static void main(String[] args) {
+        junit.textui.TestRunner.run(theweeklychallenge.DotProduct.class);
+    }
+
+    public void testDotProduct() {
+        assertEquals(32, dotProduct(new int[] {1,2,3}, new int[] {4,5,6}));
+    }
+
+    public static int dotProduct(int[] a, int[] b) {
+
+        int dp = 0;
+        if (a.length == b.length) {
+            for(int i = 0; i < a.length; i++) {
+                dp += a[i] * b[i];
+            }
+        }
+
+        return dp;
+    }
+}