finding palindromes java code example
Example 1: Java program to check whether string is palindrome using library methods
public class StringPalindromeJava
{
public static void isPalindrome(String str)
{
String strReverse = new StringBuffer(str).reverse().toString();
if(str.equals(strReverse))
{
System.out.println(str + " is palindrome string.");
}
else
{
System.out.println(str + " is not palindrome string.");
}
}
public static void main(String[] args)
{
isPalindrome("eye");
isPalindrome("rotator");
}
}
Example 2: easy palindrome program in java
import java.util.*;
class PalindromeExample2
{
public static void main(String args[])
{
String original, reverse = "";
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.");
}
}
Example 3: String palindrome in java using array
import java.util.Arrays;
import java.util.Scanner;
public class StringPalindromeUsingArray
{
public static void main(String[] args)
{
System.out.println("Please enter string to check whether string is palindrome: ");
Scanner sc = new Scanner(System.in);
String strInput = sc.nextLine();
char[] chArray = strInput.toCharArray();
int size = chArray.length;
char[] chGiven = Arrays.copyOf(chArray, chArray.length);
for(int a = 0; a < size / 2; a++)
{
char temp = chArray[a];
chArray[a] = chArray[size - a - 1];
chArray[size - a - 1] = temp;
}
System.out.println("Given array: " + Arrays.toString(chGiven));
System.out.println("String palindrome using array: " + Arrays.toString(chArray));
if(Arrays.equals(chArray, chGiven))
{
System.out.println("string is palindrome.");
}
else
{
System.out.println("string is not a palindrome.");
}
sc.close();
}
}
Example 4: palindrome function java
package test
public boolean isPalindromString(String text){
String reverse = reverse(text);
if(text.equals(reverse))
{
return true;
}
return false;
}
public String reverse(String input)
{
if(input == null || input.isEmpty())
{
return input;
}
return input.charAt(input.length()- 1) + reverse(input.substring(0, input.length() - 1));
}