public static boolean isOdd(int i) {
return i % 2 != 0;
}Check whether given number is even or odd
Carvia Tech | May 24, 2019 | 1 min read | 144 views
We can easily find if a number is even or odd in Java using the below method.
Using remainder operation for even odd check
Here we are checking if the remainder operation returns a non-zero result when divided by 2.
Generally, the better (and faster) approach is to using AND operator, as shown in below code snippet:
Using AND operator for even/odd check
public static boolean isOdd(int i) {
return (i & 1) != 0;
}Here we are checking if the least significant bit (LSB) is zero or not. If it is zero then number is even else number is odd.
This may not work
As suggested in Puzzle 1: Oddity in Java Puzzler book, the below code will not work for all negative numbers.
This method will fail for all negative odd numbers
public static boolean isOdd(int i) {
return i % 2 == 1;
}Reference
-
Java Puzzlers: Traps, Pitfalls, and Corner Cases by Joshua Bloch, Neal Gafter. Puzzle 1: Oddity
Top articles in this category:
- Top 15 coding problems for SDET Java Interviews
- Top 50 SDET Java Programming Interview Questions & Answers
- SDET: JUnit interview questions for automation engineer
- SDET: Rest Assured Interview Questions
- Check if the given number is Armstrong Number in Java
- Check a number is Prime: Java Coding Problem
- Check if the given string is palindrome
Find more on this topic:
SDET Interviews
SDET Java Interview pattern and collection of questions covering SDET coding challenges, automation testing concepts, functional, api, integration, performance and security testing, junit5, testng, jmeter, selenium and rest assured
Last updated 1 week ago
Recommended books for interview preparation:
Book you may be interested in..
Book you may be interested in..
Book you may be interested in..
Similar Posts
- Top 15 coding problems for SDET Java Interviews
- REST Assured vs Apache HttpClient and RestTemplate
- Java 11 HttpClient with Basic Authentication
- HTTP GET request with Java 11 HttpClient - Kotlin
- HTTP Head request using Java 11 HttpClient - Kotlin
- Using Java 11 HttpClient with Kotlin Coroutines
- Migrating Spring Boot tests from Junit 4 to Junit 5
- Parameterized Tests using JUnit 5
- Creating custom Tag in Junit5 based tests
- Writing a simple Junit 5 test
Free Email Updates
Provide email address to subscribe to this blog.