JAvaは返信文字か否かを判断する

public class PalindromeTest {

   public static void main(String[] args) {
           isPalidrome("abcdedcba") ;
    }

   public static void isPalidrome(String str){
       char[] ch = str.toCharArray();
       int len = ch.length;
       for (int i = 0, int j = len - 1; i <= j;) {
           if (ch[i++] == ch[j--]) {
           } else {
                System.out.println("this string is not palindrome!");
                break;
          }
       }
   }
}

 
  また、Javaは逆シーケンス出力を実現する:
 

public class InverseString {
	public static void main(String[] args) {
		String str = "fdsadsasssggg";
		System.out.println(inverseString(str));
	}

	public static String inverseString(String s) {
		char[] a = new char[s.length()];
		char[] temp = s.toCharArray();
		for (int i = temp.length-1,j=0; i >=0;) {
			a[j++] = temp[i--];
		}
		return String.valueOf(a);
	}
}