- Added Java solutions to the week 173.

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diff --git a/challenge-173/mohammad-anwar/java/theweeklychallenge/EstheticNumber.java b/challenge-173/mohammad-anwar/java/theweeklychallenge/EstheticNumber.java
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+++ b/challenge-173/mohammad-anwar/java/theweeklychallenge/EstheticNumber.java
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+package theweeklychallenge;
+
+/*
+
+Week 173:
+
+    https://theweeklychallenge.org/blog/perl-weekly-challenge-173
+
+Task #1: Esthetic Number
+
+    You are given a positive integer, $n.
+
+    Write a script to find out if the given number is Esthetic Number.
+
+Compile and Run:
+
+    mohammad-anwar/java$ javac theweeklychallenge/EstheticNumber.java
+    mohammad-anwar/java$ java  theweeklychallenge.EstheticNumber
+
+*/
+
+import java.lang.Math;
+import junit.framework.TestCase;
+import static junit.framework.Assert.*;
+
+public class EstheticNumber extends TestCase {
+
+    public static void main(String[] args) {
+        junit.textui.TestRunner.run(
+            theweeklychallenge.EstheticNumber.class);
+    }
+
+    public void testEstheticNumber() {
+        assertTrue(isEstheticNumber(5456));
+        assertFalse(isEstheticNumber(120));
+    }
+
+    public static boolean isEstheticNumber(int n) {
+        String s = Integer.toString(n);
+        int i = 1;
+        while (i < s.length()) {
+            if (Math.abs((int)(s.charAt(i-1)) - (int)(s.charAt(i))) != 1) {
+                return false;
+            }
+            i++;
+        }
+
+        return true;
+    }
+}