string palindrome in java using array

1public static boolean checkPalindrome(String str)
2{     
3 
4    int len = str.length();
5
6    for(int i = 0; i < len / 2; i++)  {
7        if (str.charAt(i) != str.charAt(len - i - 1))
8            return false;
9    }
10    return true;
11}

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}  

1import java.util.Scanner;
2
3public class Palindrome
4{
5  public static void main(String args[])
6  {
7    int num,temp,reverse=0;
8    Scanner input=new Scanner(System.in);
9    num=in.nextInt();
10    temp=num;
11    //code to reverse the number
12    while(temp!=0)
13    {
14      int d=temp%10; //extracts digit at the end
15      reverse=reverse*10+d;
16      temp/=10; //removes the digit at the end
17    }
18    // 'reverse' has the reverse version of the actual input, so we check
19    if(reverse==num)
20    {
21      System.out.println("Number is palindrome");
22    }
23    else
24    {
25      System.out.println("Number is not palindrome");
26    }
27  }
28}

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    }

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        }
21return input.charAt(input.length()- 1) + reverse
22                         (input.substring(0, input.length() - 1));
23    }

1// String palindrome in java using array
2import java.util.Arrays;
3import java.util.Scanner;
4public class StringPalindromeUsingArray 
5{
6   public static void main(String[] args) 
7   {
8      System.out.println("Please enter string to check whether string is palindrome: ");
9      Scanner sc = new Scanner(System.in);
10      String strInput = sc.nextLine();
11      char[] chArray = strInput.toCharArray();
12      int size = chArray.length;
13      char[] chGiven = Arrays.copyOf(chArray, chArray.length);
14      for(int a = 0; a < size / 2; a++) 
15      {
16         char temp = chArray[a];
17         chArray[a] = chArray[size - a - 1];
18         chArray[size - a - 1] = temp;
19      }
20      System.out.println("Given array: " + Arrays.toString(chGiven));
21      System.out.println("String palindrome using array: " + Arrays.toString(chArray));
22      if(Arrays.equals(chArray, chGiven)) 
23      {
24         System.out.println("string is palindrome.");
25      }
26      else 
27      {
28         System.out.println("string is not a palindrome.");
29      }
30      sc.close();
31   }
32}