First commit of partial RosettaCode contents.

Pushing this for testing purposes. Lots of work still needed.

Task/Knuth_shuffle/Java/knuth_shuffle.java

@@ -0,0 +1,24 @@
+import java.util.Random;
+
+public static final Random gen = new Random();
+
+// version for array of ints
+public static void shuffle (int[] array) {
+    int n = array.length;
+    while (n > 1) {
+        int k = gen.nextInt(n--); //decrements after using the value
+        int temp = array[n];
+        array[n] = array[k];
+        array[k] = temp;
+    }
+}
+// version for array of references
+public static void shuffle (Object[] array) {
+    int n = array.length;
+    while (n > 1) {
+        int k = gen.nextInt(n--); //decrements after using the value
+        Object temp = array[n];
+        array[n] = array[k];
+        array[k] = temp;
+    }
+}