Here are a few ways for checking for Palindrome in java.
Example 1: Palindrome using StringBuffer
This program demonstates testing for a Palindrome word using StringBuffer.
We accept a work from keyboard(System.in) and assign it to inputString.
Then we created a StringBuffer with this and reverse it.
If the inputString and StringBuffer contents match, it’s a Palindrome.
package com.javatutorial;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class ExamplePalindromeUsingStringBuffer {
public static void main(String[] args) throws IOException {
System.out.println("Enter a string");
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String inputString = br.readLine();
StringBuffer sb = new StringBuffer(inputString);
sb.reverse();
String newStrnig = sb.toString();
if(newStrnig.equalsIgnoreCase(inputString))
System.out.println(inputString + " is a Palindrome");
else
System.out.println(inputString + " is NOT a Palindrome");
}
}
Output :
Enter a string
racecar
racecar is a Palindrome
Example 2: Palindrome without String functions
This program demonstrates testing for a Palindrome using char[].
This method loops through each character in reverse order and checks if it matches the character at corresponding position in original array.
package com.javatutorial;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class ExamplePalindrome {
public static void main(String[] args) throws IOException {
System.out.println("Enter a string");
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String input = br.readLine();
System.out.println(IsPalindrome(input.toCharArray()));
}
public static String IsPalindrome(char[] word)
{
int min = 0;
int max = word.length - 1;
while(max > min){
if(word[max] != word[min]){
return "not a palindrome";
}
min ++;
max --;
}
return "palindrome";
}
}
Output:
Enter a string
anna
palindrome
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