Java coding tests online

Java Online Coding Tests

Create and send Java coding assessments in 60 seconds, even if you’re not techy.
Hand over qualified Java candidates for your Engineering team to interview.

About our Java Coding Tests

We provide your team with realistic and practical coding tests that accurately evaluate candidates’ Java skills. Using solutions like CoderPad Screen, you’ll be able to create Java coding tests in 60 seconds even if you’re not techy.

Our tests are designed to cover essential concepts, object-oriented programming, data structures, algorithms, and more. These tests are crafted by our industry experts, ensuring their alignment with real-world scenarios and their effectiveness in assessing candidates’ abilities.
Hiring managers who would like to go further can even customize the test and add their own coding exercises.

• Recommended duration: 17-45 min
• Average number of questions:
• Type of exercises: Multiple choice, coding exercises
• Test levels: Junior, Senior, Expert

Java skills to assess

Jobs using Java

Java Sample Questions

Example Question 1

In this exercise, you have to analyze records of temperature to find the closest to zero.

Implement the function int compute_closest_to_zero(vector ts) which takes an array of temperatures ts and returns the temperature closest to 0.

Explore Code Playback

Gain a deeper insight into the thought process and coding abilities of your developer candidates.

• Observe their algorithm-building skills and evaluate their approach and coding instincts.
• Make a mental note of areas that you would like to explore further in subsequent discussions.
• Be vigilant in identifying any questionable or concerning behavior

Access a library of 4000+ coding tests and exercises for more than 80+ roles

How to test Java skills to hire for your team?

Relying solely on resumes may not accurately represent a Java developer’s skills, and self-reported skills can be unreliable.

Here are five ways to assess Java developers’ coding skills:

• Review their programmer portfolio, which showcases Java projects they have worked on and their proficiency in the language.
• Examine their GitHub account to assess their Java code quality, activity, and involvement in Java-related projects.
• Inquire about their use of Stack Overflow to gauge their knowledge level and participation in the Java development community.
• Use programming tests tailored for Java developers, allowing them to solve practical Java problems and assessing their coding skills objectively.
• Conduct live coding interviews specific to Java, where candidates can demonstrate their coding skills, problem-solving abilities, and knowledge of Java concepts.

How to approach initial candidate screening effectively?

Some recruiters may have concerns about testing candidates too early in the hiring process, as they fear it might offend or deter them. However, this doesn’t have to be the case. It is crucial to handle this situation appropriately to ensure candidates understand the purpose, feel their time is valued, and recognize their importance.

Follow these guidelines to incorporate early testing while ensuring a positive candidate experience:

1. Job Ad: Clearly communicate that testing is the first step in your hiring process within your job advertisement. By setting this expectation upfront, you eliminate the risk of candidates feeling singled out for testing. Additionally, provide information about the time commitment required so that candidates can plan accordingly.

1. Emphasize Fair Hiring and Diversity: Highlight how the testing process enables fair hiring practices and promotes diversity within your organization. Make it known that your focus is on assessing skills rather than judging candidates based on irrelevant factors. Convey that you are open to considering a diverse pool of candidates, including those without prestigious degrees or individuals starting their coding careers.

1. Concise Assessment: Keep the assessment as brief as possible, respecting candidates’ time. Select an appropriate length for the test, including only the skills that are truly essential for the position. Ideally, aim for a test that can be completed within an hour or less. If you can design an even shorter test that fulfills your requirements, it’s even better.

1. Relevance: Concentrate solely on the skills that are directly applicable to the role. Avoid the temptation to create a laundry list of nice-to-have skills that are unnecessary for the actual job. Demonstrating a pragmatic approach by focusing on skills that have a practical impact on day-to-day tasks is appreciated by developers.

1. Share Results: Provide candidates with their test results to ensure a more fulfilling experience. If you utilize a tool like CoderPad Screen, which automatically generates a brief report and sends it to candidates, you enhance their experience. Candidates who underperform will understand the reasons they weren’t selected for the next stage, and receiving results also serve as an additional incentive for completing the test.

We had no unified approach or tool to assess technical ability. Today, CoderPad Screen enables us to test against a wide selection of languages and is continually updated.

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Online Java — IDE, Code Editor, Compiler

Online Java is a web-based tool powered by ACE code editor. Build, Run & Share Java code online using online-java’s IDE for free. It’s one of the quick, robust, powerful online compilers for java language. Don’t worry about setting up java environment in your local. Now Run the java code in your favorite browser instantly. Getting started with this editor is so easy and fast. Just write the program and click the RUN button!! Code can be saved online by using the SHARE option that enables you to access your code anywhere using internet.

What is Java?

Java is a popular general-purpose programming language which was originally developed by James Gosling at Sun Microsystems (later acquired by Oracle). Java is fast, secure, and reliable. It is widely used for developing desktop and mobile applications, embedded systems, game consoles, supercomputers, big data processing, and so on. According to Oracle, Java runs on 3 billion devices worldwide, which makes it one of the most popular programming languages.

Why learn Java?

• Web-based Applications
• Mobile App Development
• Desktop GUI Applications
• Gaming Applications
• Big Data Technologies
• Distributed Applications
• Cloud-Based Applications
• IoT Applications

Features of this tool

• Simple & Clean Design, Lightweight, Easy & Fast
• Interactive program execution which makes the user to give program inputs at real time
• Helpful for beginners to learn and practice programs
• Dark & Light theme options and customizable code editor with more themes
• Options to Copy or Download the Output of the Program
• Expandable Output Terminal
• Coding sharing option helps you to save your code in cloud so that it can be accessed anytime and anywhere with internet

Learn Other Programming Language?

Visit online-ide.com to learn and practice top programming languages — C, C++, Java, Python, Ruby, PHP, R, GoLang

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Free Online Java Test Quiz, OCAJP OCPJP Mock Exams

Online Java Test Quiz. Take the FREE Java programming test and SCJP OCPJP OCAJP mock exams. Each mock exam contains multiple Java quiz questions to cover important Java concepts. Quiz results will be displayed along with your score, average score, and quiz question answers.

Click on any of the below given links to start the mock exam online.

Java Language Basics

• Java Language Basics Quiz – 1 (10 Questions)
• Java Language Basics Quiz – 2 (10 Questions)
• Java Language Basics Quiz – 3 (10 Questions)
• Java Language Basics Quiz – 4 (10 Questions)
• Java Language Basics Quiz – 5 (10 Questions)
• Java Language Basics Quiz – 6 (10 Questions)
• Java Operators Quiz – 1 (10 Questions)
• Java Operators Quiz – 2 (10 Questions)
• Java Operators Quiz – 3 (12 Questions)

Flow Control & Exception

• If Else Quiz (10 Questions)
• Assertion Quiz (10 Easy Questions)
• Assertion Quiz (15 Medium/Hard Questions)
• Switch Quiz (12 Questions)
• While, Do While Loop Quiz (20 Questions)
• For Loop Quiz (20 Questions)
• Exception Handling Quiz – 1 (10 Questions)
• Exception Handling Quiz – 2 (10 Questions)
• Exception Handling Quiz – 3 (10 Questions)

Object Oriented Programming

• Java Object Oriented Programming Quiz – 1 (10 Questions)
• Java Object Oriented Programming Quiz – 2 (10 Questions)
• Java Object Oriented Programming Quiz – 3 (10 Questions)
• Java Object Oriented Programming Quiz – 4 (10 Questions)
• Java Object Oriented Programming Quiz – 5 (10 Questions)
• Java Object Oriented Programming Quiz – 6 (10 Questions)
• Java Object Oriented Programming Quiz – 7 (10 Questions)
• Java Object Oriented Programming Quiz – 8 (10 Questions)
• Java Object Oriented Programming Quiz – 9 (10 Questions)
• Java Object Oriented Programming Quiz – 10 (10 Questions)

Declaration Initialization and Access Control

• Java Declaration Initialization and Access Control Quiz – 1 (10 Questions)
• Java Declaration Initialization and Access Control Quiz – 2 (10 Questions)
• Java Declaration Initialization and Access Control Quiz – 3 (10 Questions)
• Java Declaration Initialization and Access Control Quiz – 4 (10 Questions)
• Java Declaration Initialization and Access Control Quiz – 5 (10 Questions)
• Java Declaration Initialization and Access Control Quiz – 6 (10 Questions)
• Java Declaration Initialization and Access Control Quiz – 7 (10 Questions)
• Java Declaration Initialization and Access Control Quiz – 8 (10 Questions)
• Java Declaration Initialization and Access Control Quiz – 9 (10 Questions)
• Java Declaration Initialization and Access Control Quiz – 10 (10 Questions)

Java test contains quiz questions from below given test objectives.

Java Language Basics

• Java package declaration and uses
• Using appropriate access modifiers
• Using import statements to import various packages and classes
• Using command line arguments to run the program and accessing arguments in the code
• Passing objects and primitive values in the methods as parameters
• Understanding how Java garbage collection works along with the behavior of the finalize method of the Object class
• Understanding and setting classpath to refer classes in the program
• Using and creating jar files
• Using various operators like assignment operators, arithmetic operators, instanceof operator, logical and conditional operators

Multithreading

• Creating threads using Thread class and Runnable interface
• Understanding thread states
• Understanding thread locking
• Using wait, notify and notifyAll methods

Java API

• Using wrapper classes
• Understanding autoboxing and unboxing
• Using String, StringBuffer, and StringBuilder classes
• Understanding and using serialization
• Using java.text package to format date, time and numbers
• Using java.util.regex package, using Pattern and Matcher classes
• Understanding the usage of java.io package

Object Oriented Programming

• Creating and using classes and objects
• Understanding inheritance and using interfaces
• Understanding encapsulation and polymorphism (compile time vs runtime)
• Overriding and overloading methods
• Using overloaded constructors, instance variables and static variables, static methods
• Using abstract classes and methods
• Using super and this keywords

Flow control and exception handling

• Understand and use the switch statement
• Understand usage of if, else if and else statements
• Use loops like while loop, for loop, enhanced for loop
• Use labels, break and continue statements
• Understand and use assertions
• Understanding and using checked and unchecked exceptions
• Handling runtime errors
• Understanding usage of throw, throws, catch and finally
• Creating and using custom exceptions

Java Collections & Generics

• Determine when to use which collection
• Using equals and hashCode methods
• Using collections like Set, List, and Map
• Sorting and searching collections
• Usage of type parameters in the class declaration, instance, and local variables and return types

Declaration, Initialization, Access Control

• Declaring classes, interfaces, nested classes and enums
• Declare and use static variables and methods
• Declaring and using default constructor as well as parameterized constructors
• Declaring and initializing primitive variables, arrays, and objects
• Declaring instance and local variables

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