Java: 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

Oddness Check

Is it possible to use this code to accurately determine the odd number?

public boolean oddOrNot(int num) {
  return num % 2 == 1;

I hope you noticed a trick. If we decide to check a negative odd number in such a way (-5, for example), the remainder of the division will not be equal to one (what does it mean?) Therefore, use a more accurate method:

public boolean oddOrNot(int num) {
  return (num & 1) != 0;

It not only solves the problem of negative numbers, but also works more productively than its predecessor. Arithmetic and logical operations are performed much faster than multiplication and division.

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


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