- Added guest contribution by Laurent Rosenfeld.

1 files changed, 23 insertions, 0 deletions

diff --git a/challenge-173/laurent-rosenfeld/java/ch-1.java b/challenge-173/laurent-rosenfeld/java/ch-1.java
new file mode 100644
index 0000000000..5d3b1cd081
--- /dev/null
+++ b/challenge-173/laurent-rosenfeld/java/ch-1.java
@@ -0,0 +1,23 @@
+import java.lang.Math;
+
+public class EstheticNumber {
+    public static void main(String[] args) {
+        Integer[] tests = {5456, 120, 121, 23456, 2346, 7654567, 765467};
+        for (int i = 0; i <= 6; i++) {
+            if (is_esthetic(tests[i])) {
+                System.out.printf("%-9d is esthetic\n", tests[i]);
+            } else {
+                System.out.printf("%-9d is not esthetic\n", tests[i]);
+            }
+        }
+    }
+    public static boolean is_esthetic(int n) {
+        String s = Integer.toString(n);
+        for (int i = 1; i < s.length(); i++ ) {
+            if (Math.abs((int)(s.charAt(i)) - (int)(s.charAt(i-1))) != 1) {
+                return false;
+            }
+        }
+        return true;
+    }
+}