java program to check whether string is palindrome using library methods

1import java.util.Scanner;
2public class RecursivePalindromeJava 
3{
4   // to check if string is palindrome using recursion
5   public static boolean checkPalindrome(String str)
6   {
7      if(str.length() == 0 || str.length() == 1)
8         return true; 
9      if(str.charAt(0) == str.charAt(str.length() - 1))
10         return checkPalindrome(str.substring(1, str.length() - 1));
11      return false;
12   }
13   public static void main(String[]args)
14   {
15      Scanner sc = new Scanner(System.in);
16      System.out.println("Please enter a string : ");
17      String strInput = sc.nextLine();
18      if(checkPalindrome(strInput))
19      {
20         System.out.println(strInput + " is palindrome");
21      }
22      else
23      {
24         System.out.println(strInput + " not a palindrome");
25      }
26      sc.close();
27   }
28}

1public class StringPalindromeJava
2{
3   public static void isPalindrome(String str)
4   {
5      String strReverse = new StringBuffer(str).reverse().toString();
6       // checking for palindrome
7      if(str.equals(strReverse))
8      {
9         System.out.println(str + " is palindrome string.");
10      }
11      else
12      {
13         System.out.println(str + " is not palindrome string.");
14      }
15   }
16   public static void main(String[] args)
17   {
18      // palindrome java
19      isPalindrome("eye");
20      isPalindrome("rotator");
21   }
22}

1import java.util.*;   
2class PalindromeExample2  
3{  
4   public static void main(String args[])  
5   {  
6      String original, reverse = ""; // Objects of String class  
7      Scanner in = new Scanner(System.in);   
8      System.out.println("Enter a string/number to check if it is a palindrome");  
9      original = in.nextLine();   
10      int length = original.length();   
11      for ( int i = length - 1; i >= 0; i-- )  
12         reverse = reverse + original.charAt(i);  
13      if (original.equals(reverse))  
14         System.out.println("Entered string/number is a palindrome.");  
15      else  
16         System.out.println("Entered string/number isn't a palindrome.");   
17   }  
18}  

1package test
2//The function below checks if a string is a palindrome
3//True = Is a palindrome & False = Not a palindrome
4	public boolean isPalindromString(String text){
5    	String reverse = reverse(text);
6      	if(text.equals(reverse))
7    	{
8        	return true;
9      	}
10      
11      	return false;
12    }
13//This function returns the reverse String of its input.
14//Ex. if given "hello", it will return "olleh"
15	public String reverse(String input)
16    {     
17		if(input == null || input.isEmpty())
18        {
19			return input;
20        }
21        	return input.charAt(input.length()- 1) + reverse(input.substring(0, input.length() - 1));
22    }