Q:

Palindrome Program in Java

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robaa
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2022-11-11
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Palindrome number in java: A palindrome number is a number that is same after reverse. For example 545, 151, 34543, 343, 171, 48984 are the palindrome numbers. It can also be a string like LOL, MADAM etc.

Palindrome number algorithm

  • Get the number to check for palindrome
  • Hold the number in temporary variable
  • Reverse the number
  • Compare the temporary number with reversed number
  • If both numbers are same, print "palindrome number"
  • Else print "not palindrome number"
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robaa
2022-11-11
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Let's see the palindrome program in java. In this java program, we will get a number variable and check whether number is palindrome or not.

class PalindromeExample{  
 public static void main(String args[]){  
  int r,sum=0,temp;    
  int n=454;//It is the number variable to be checked for palindrome  
  
  temp=n;    
  while(n>0){    
   r=n%10;  //getting remainder  
   sum=(sum*10)+r;    
   n=n/10;    
  }    
  if(temp==sum)    
   System.out.println("palindrome number ");    
  else    
   System.out.println("not palindrome");    
}  
}

 

 

Output:

palindrome  number

 

Palindrome Program in Java (Another way)

You can also use a method where number or string is not predefined. Here, user has to put the number or string as input to check if the number/string is palindrome.

import java.util.*;   
class PalindromeExample2  
{  
   public static void main(String args[])  
   {  
      String original, reverse = ""; // Objects of String class  
      Scanner in = new Scanner(System.in);   
      System.out.println("Enter a string/number 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/number is a palindrome.");  
      else  
         System.out.println("Entered string/number isn't a palindrome.");   
   }  
}

 

Output:

Use image PalindromeExample

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