diff --git a/src/com/apple/demo/ArrayTest4.java b/src/com/apple/demo/ArrayTest4.java
new file mode 100644
index 0000000..1c0f63b
--- /dev/null
+++ b/src/com/apple/demo/ArrayTest4.java
@@ -0,0 +1,14 @@
+package com.apple.demo;
+
+import java.util.Arrays;
+import java.util.Collections;
+
+public class ArrayTest4 {
+    public static void main(String[] args) {
+        String[] a = {"a", "A", "b", "B"};
+        Arrays.sort(a, Collections.reverseOrder());
+        for(int i=0;i<a.length;i++){
+            System.out.println(a[i]);
+        }
+    }
+}