init

in_class/cse123-inclass9/IsPalindromeArray.java

@@ -0,0 +1,25 @@
+public class IsPalindromeArray {
+    public static void main(String[] args) {
+        System.out.println(isPalindrome(new int[] { 1, 2, 3, 4, 5, 4, 3, 2, 1 }));
+        System.out.println(isPalindrome(new int[] { 10, 20, 20, 10 }));
+        System.out.println(isPalindrome(new int[] { 1 }));
+        System.out.println(isPalindrome(new int[] {}));
+        System.out.println(isPalindrome(new int[] { 1, 2, 3, 4, 5 }));
+        System.out.println(isPalindrome(new int[] { 1, 2, 5, 3 }));
+        System.out.println(isPalindrome(new int[] { 10, 20, 30, 10 }));
+    }
+
+    public static boolean isPalindrome(int[] array) {
+        return isPalindrome(array, 0, array.length - 1);
+    }
+
+    private static boolean isPalindrome(int[] array, int lower, int upper) {
+        if (upper - lower < 1) {
+            return true;
+        } else if (array[lower] != array[upper]) {
+            return false;
+        } else {
+            return isPalindrome(array, lower+1,upper-1);
+        }
+    }
+}