Encrypt Sentence with Caesar Cipher method

Caesar_Cipher_Encryption.java

/*
 *Enter a Sentence and Encrypt it with Caesar Cipher method (13 characters shift)

 *Hello! How are you?
 *Uryyb! Ubj ner lbh?
 */


import java.util.Scanner;

class Caesar_Cipher_Encryption
{
    public static void main(String[] args)
    {
        Scanner sc = new Scanner(System.in);

        System.out.println("Enter the sentence");
        String sentence = sc.nextLine();

        for(int i = 0; i < sentence.length(); i++)
        {
            char ch = sentence.charAt(i);
            if(ch >= 'a' && ch <= 'z')
            {
                ch = (char)(ch + 13);
                if(ch > 'z')
                {
                    ch = (char)(ch - 26);
                }
            }
            else if(ch >= 'A' && ch <= 'Z')
            {
                ch = (char)(ch + 13);
                if(ch > 'Z')
                {
                    ch = (char)(ch - 26);
                }
            }
            System.out.print(ch);
        }
    }
}