Java Exercises: Reverse a string

Java Basic: Exercise-37 with Solution

Write a Java program to reverse a string.

Test Data:
Input a string: The quick brown fox

Pictorial Presentation: Reverse a string

Java: Reverse a string

Sample Solution:

Java Code:

import java.util.Scanner;
public class Exercise37 {
     public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Input a string: ");
        char[] letters = scanner.nextLine().toCharArray();
        System.out.print("Reverse string: ");
        for (int i = letters.length - 1; i >= 0; i--) {

Sample Output:

Input a string: The quick brown fox                      
Reverse string: xof nworb kciuq ehT


Flowchart: Java exercises: Reverse a string

Java Code Editor:

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Java: Tips of the Day


Returns an array of elements that appear in both arrays.
Use Arrays.stream().filter() to remove values that are not part of second, determined using Arrays.stream().anyMatch().

public static <T> T[] similarity(T[] first, T[] second) {
    return Arrays.stream(first)
            .filter(a -> Arrays.stream(second).anyMatch(b -> Objects.equals(a, b)))
            // Make a new array of first's runtime type, but empty content:
            .toArray(i -> (T[]) Arrays.copyOf(new Object[0], i, first.getClass()));

Ref: https://bit.ly/3CJ7huF