feat(class14): 真的，不能再....学了.....

- 新增 ArrayTest4 类，包含 main 方法作为程序入口
- 实现 start 方法，创建并初始化一副扑克牌数组
- 实现 shufflePokers 方法，使用 Fisher-Yates 算法对扑克牌进行洗牌
- 在 main 方法中调用 start 和 shufflePokers 方法，展示洗牌前后的扑克牌数组

src/class14/ArrayTest4.java

@@ -0,0 +1,40 @@
+package class14;
+
+import java.util.Arrays;
+
+// ... existing code ...
+public class ArrayTest4 {
+    public static void main(String[] args) {
+        String[] pokers = start();
+        String[] shuffledPokers = shufflePokers(pokers);
+        System.out.println(Arrays.toString(shuffledPokers));
+    }
+
+    public static String[] start() { // 创建一个数组，用来模拟一个扑克牌
+        String[] pokers = new String[54];
+        String[] colors = {"♠", "♥", "♣", "♦"};
+        String[] numbers = {"3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K", "A", "2"};
+        int i = 0;
+        for (String number : numbers) {
+            for (String color : colors) {
+                pokers[i] = color + number;
+                i++;
+            }
+        }
+        pokers[i] = "小王";
+        pokers[i + 1] = "大王";
+        System.out.println(Arrays.toString(pokers));
+        return pokers;
+    }
+
+    public static String[] shufflePokers(String[] pokers) {
+        // 使用 Fisher-Yates 洗牌算法
+        for (int i = pokers.length - 1; i > 0; i--) {
+            int index = (int) (Math.random() * (i + 1));
+            String temp = pokers[i];
+            pokers[i] = pokers[index];
+            pokers[index] = temp;
+        }
+        return pokers;
+    }
+}