Backend/shuffle #135

packages/backend/spring/src/main/java/tw/waterballsa/gaas/citadels/spring/util/shuffle.java

@@ -0,0 +1,28 @@
+package tw.waterballsa.gaas.citadels.spring.util;
+
+import java.util.Arrays;
+import java.util.Random;
+
+public class shuffle {
+    static void shuffle(int array[], int a) {
+        Random rd = new Random();
+
+        for (int i = a - 1; i > 0; i--) {
+            int j = rd.nextInt(i+1);
+
+            int temp = array[i];
+            array[i] = array[j];
+            array[j] = temp;
+        }
+
+        System.out.println(Arrays.toString(array));
+    }
+
+    public static void main(String[] args) {
+        int[] ar = {1,2,3,4,5};
+
+        int b = ar.length;
+        shuffle(ar, b);
+    }
+}
+