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A palindrome is a string that reads the same forward and backward, such as "madam" or "racecar". In Java 8, you can check for palindromes elegantly using the Streams API.
Example using Java 8 IntStream:
import java.util.stream.IntStream;public class PalindromeJava8 {public static boolean isPalindrome(String input) {String str = input.toLowerCase(); // case-insensitive checkreturn IntStream.range(0, str.length() / 2).noneMatch(i -> str.charAt(i) != str.charAt(str.length() - i - 1));}public static void main(String[] args) {String s1 = "Racecar";String s2 = "Hello";System.out.println(s1 + " -> " + isPalindrome(s1)); // trueSystem.out.println(s2 + " -> " + isPalindrome(s2)); // false}}コピーしました。✕コピーOutput:
Racecar -> trueHello -> falseコピーしました。✕コピーHow it works:
Converts the string to lowercase for case-insensitive comparison.
Uses IntStream.range(0, length/2) to iterate only halfway.
noneMatch ensures no mismatched characters are found between mirrored positions.
Alternative Approaches:
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- In this example, we will get a number as input from the user and check whether that number is a Palindrome or not. We will also take the help of while loop and if-else conditional block.
コード サンプル
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