1 files changed, 72 insertions, 0 deletions
diff --git a/challenge-180/mohammad-anwar/java/theweeklychallenge/FirstUniqueCharacter.java b/challenge-180/mohammad-anwar/java/theweeklychallenge/FirstUniqueCharacter.java
new file mode 100644
index 0000000000..34bf56bc6a
--- /dev/null
+++ b/challenge-180/mohammad-anwar/java/theweeklychallenge/FirstUniqueCharacter.java
@@ -0,0 +1,72 @@
+package theweeklychallenge;
+
+/*
+
+Week 180:
+
+    https://theweeklychallenge.org/blog/perl-weekly-challenge-180
+
+Task #1: First Unique Character
+
+    You are given a string, $s.
+
+    Write a script to find out the first unique character in the
+    given string and print its index (0-based).
+
+Compile and Run:
+
+    mohammad-anwar/java$ javac theweeklychallenge/FirstUniqueCharacter.java
+    mohammad-anwar/java$ java  theweeklychallenge.FirstUniqueCharacter
+
+*/
+
+import java.util.Map;
+import java.util.TreeMap;
+import java.util.ArrayList;
+import junit.framework.TestCase;
+import static junit.framework.Assert.*;
+
+public class FirstUniqueCharacter extends TestCase {
+
+    public static void main(String[] args) {
+        junit.textui.TestRunner.run(
+            theweeklychallenge.FirstUniqueCharacter.class);
+    }
+
+    public void testDammAlgorithm() {
+        assertEquals(firstUniqueCharacter("Perl Weekly Challenge"), 0);
+        assertEquals(firstUniqueCharacter("Long Live Perl"), 1);
+    }
+
+    public static int firstUniqueCharacter(String str) {
+        char[] chars = str.toCharArray();
+        ArrayList<Character> chars_array = new ArrayList<Character>();
+        Map<Character, Integer> chars_map = new TreeMap<Character, Integer>();
+        int j = 0;
+        for (int i = 0; i < chars.length; i++) {
+            char c = chars[i];
+            if (Character.compare(c, ' ') == 0) {
+                continue;
+            }
+            c = Character.toLowerCase(c);
+            if (chars_map.containsKey(c)) {
+                chars_map.put(c, chars_map.get(c) + 1);
+            }
+            else {
+                chars_array.add(c);
+                chars_map.put(c, 1);
+                j++;
+            }
+        }
+
+        int k = 0;
+        for (char c : chars_array) {
+            if (chars_map.get(c) == 1) {
+                break;
+            }
+            k++;
+        }
+
+        return k;
+    }
+}