Piratizer string converter

src/edu/macalester/comp124/stringtransformer/Piratizer.java

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+package edu.macalester.comp124.stringtransformer;
+
+import acm.util.RandomGenerator;
+
+import java.util.Random;
+
+/**
+ * Created by rberman on 2/27/14.
+ *
+ *
+ */
+public class Piratizer extends StringTransformer {
+    @Override
+    public String transform(String s) {
+        String finalS = "";
+        for (int i = 0; i < s.length(); i++) {
+            if (s.charAt(i) == 'r') {
+                finalS += "rr";
+            }
+            finalS += s.charAt(i);
+            if (s.charAt(i) == '.') {
+                int rand = randomArr();
+                if (rand == 1) {
+                    finalS += "Arrrrr!";
+                }
+                if (rand == 2) {
+                    finalS += "Ahoy!";
+                }
+            }
+        }
+        return finalS;
+    }
+
+    @Override
+    public String toString() {
+        return "Piratizer";
+    }
+
+    public int randomArr(){
+        Random generator = new Random();
+        int a = generator.nextInt(8);
+        return a;
+    }
+
+}
+
+
+/*
+All rs are changed to rrrs. 25% of sentences end with a random choice between Arrrrr! and Ahoy!.
+ */

test/edu/macalester/comp124/stringtransformer/PiratizerTest.java

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+package edu.macalester.comp124.stringtransformer;
+
+import org.junit.Test;
+import static junit.framework.Assert.assertEquals;
+
+/**
+ * Created by rberman on 2/27/14.
+ */
+public class PiratizerTest {
+    private final StringTransformer piratizer = new Piratizer();
+
+    @Test
+    public void handlesEmptyString() {
+        assertEquals("", piratizer.transform(""));
+    }
+
+    @Test
+    public void noSingleR() {
+        assertEquals("rrr", piratizer.transform("r"));
+        assertEquals("rrrobot", piratizer.transform("robot"));
+    }
+
+}