Java Snippets for beginners

Code to Reverse a Number :

import java.util.Scanner;

class ReverseNumberWhile

{

   public static void main(String args[])

   {

      int num=0;

      int reversenum =0;

      System.out.println("Input your number and press enter: ");

      //This statement will capture the user input

      Scanner in = new Scanner(System.in);

      //Captured input would be stored in number num

      num = in.nextInt();

      //While Loop: Logic to find out the reverse number

      while( num != 0 )

      {

          reversenum = reversenum * 10;

          reversenum = reversenum + num%10;

          num = num/10;

      }

      System.out.println("Reverse of input number is: "+reversenum);

   }

}

Output:

Input your number and press enter: 145689

Reverse of input number is: 986541

-------------------------------------------------------------------------

Code to check Even or Odd Number :

import java.util.Scanner;

class CheckEvenOdd
{
  public static void main(String args[])
  {
    int num;
    System.out.println("Enter an Integer number:");

    //The input provided by user is stored in num
    Scanner input = new Scanner(System.in);
    num = input.nextInt();

    /* If number is divisible by 2 then it's an even number
     * else odd number*/
    if ( num % 2 == 0 )
        System.out.println("Entered number is even");
     else
        System.out.println("Entered number is odd");
  }

}

Output :

Enter an Integer number: 78

Entered number is even

Enter an Integer number:77
Entered number is odd

-----------------------------------------------------------------------------------------------------------------

Code to find Palindrome

import java.util.*;
class Palindrome
{  
public static void main(String args[])
{  
String original, reverse = "";  
Scanner in = new Scanner(System.in);

System.out.println("Enter a string to check if it is a palindrome");  
original = in.nextLine();
int length = original.length();
for ( int i = length - 1; i >= 0; i-- )  
reverse = reverse + original.charAt(i);
if (original.equals(reverse))  
System.out.println("Entered string is a palindrome.");  
else  
System.out.println("Entered string is not a palindrome.");
}}

Output:
Enter a string to check if it is a palindrome
 madam
Entered string is a palindrome