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Java is an object-oriented, class-based programming language that is used for developing applications. It was developed by James Gosling, Patrick Naughton, Mike Sheridan and their green team for Sun Microsystems in 1995. Java was then acquired by Oracle Corporation. The original purpose of developing this language was for digital devices such as televisions and set-top boxes.

Currently, the applications created by Java programming language are not just for digital devices, but a host of other services too. Java applications are used in banking, retail, stock market, big data analytics, financial services, information technology, android development and scientific research. Organisations are continually on the lookout for skilled Java programmers for building effective and efficient tools and applications.

Recruiters hiring skilled programmers cannot just rely on traditional recruitment methods based on a resume or Java interview questions to filter out the right talent. Online assessment with Java programming interview questions can help identify candidates with the requisite domain knowledge and expertise from a huge pool of candidates. These assessments will have multiple choice questions, find the output and subjective questions that will help evaluate a candidate’s Java programming expertise. The next section gives you an idea of questions that could be asked in a Java online assessment test.

Frequently Asked Java Interview Questions

Java interview questions and assessment tests can include simple algorithmic challenges and coding challenges as well as subjective questions. 

Q1. How to serialise an object in Java?

Ans: In Java, serialisation is used to convert an object to byte stream by implementing an interface named Serializable by the class.

Q2. Find out the output of the following program

class Test  

public static void main (String args[])  

     System.out.println(10 + 20 + "Javatpoint");  

        System.out.println("Javatpoint" + 10 + 20); 


Ans: 30Javatpoint and Javatpoint1020


Case 1: 10 and 20 are considered as numbers. Their sum 30 is treated as a string and on concatenation with string Javatpoint, gives output 30Javatpoint.

Case 2: String Javatpoint is concatenated with 10 to form string Javatpoint 10, which on concatenation with 20 results in Javatpoint 1020.

Q3. What is the output of the below program?

class Test  

int test_a, test_b; 

Test(int a, int b)  

test_a = a;  

test_b = b;  

public static void main (String args[])  

     Test test = new Test();  

     System.out.println(test.test_a+" "+test.test_b); 

Ans: Compiler error

Explanation: The call to the default constructor in the main method is not added in the class. Also, the class test has only one parameterized constructor. So, no defaulter constructor is involved by constructor, leading to a compiler error.

Q4. What is the default value of int variable?

  1. Null
  2. 0
  3. 0.0
  4. Not defined

Ans: a. 0

Q5. Choose the correct syntax that can be used for the main method of a Java class?

  1. public static void mainString[]args
  2. public static int mainString[]args
  3. public int mainString[]args
  4. None of the above

Ans: a. public static void mainString[]args

Q6. What do you call the wrapping up of data and functions into a single unit?

  1. Abstraction
  2. Data Hiding
  3. Encapsulation
  4. Polymorphism

Ans: c. Encapsulation

Q7. Choose the right sequence of the major events in the life of an applet?

  1. start, init , stop , destroy
  2. init, start, stop, destroy
  3. destroy, start, init, stop
  4. init, start, destroy

Ans: b. init, start, stop, destroy


Essential Programming Skills to be Evaluated while Hiring Java Programmers

Get the best talent onboard by using the online assessment tests and Java coding interview questions based on the required domain skills and knowledge. The list of the essential coding skills that you should evaluate while hiring Java programmers are:

  • Core Java concepts
  • OOPS concepts
  • Static – keywords
  • Network APIs
  • Garbage collection
  • Multi-threading
  • Lambda expressions
  • Streams
  • Frameworks like Hibernate and Spring
  • JVM Architecture

Apart from these, the candidate should also have hands-on experience on the latest version of the programming language or the version that your project requires. Recruiters can also check to see if the candidates have the relevant certification in Java coding based on the job profile.

Applications of MeritTrac Assessment Solutions

MeritTrac’s online assessment solutions with updated Java programming interview questions can be used for hiring both beginner level and experienced programmers. These online assessments prove useful during campus hiring and walk-ins when hundreds of candidates need to be evaluated in a short span of time. Our assessment solutions can also be customised for lateral hiring for senior positions. When you have a new project that requires Java expertise, you can use these online tests to evaluate the workforce and select the right talent for the new project. Also, these tests help L&D teams identify skill gaps in the workforce, which can help them plan the training program.

MeritTrac Platform for Java Programmer Assessment

MeritTrac offers a simple and effective solution for administering Java programming tests. Our platform CodeTrac is custom-designed to deploy programming tests. MeritTrac has helped administer more than 3 lakh assessments for both hiring and training requirements. The platform is built-in with domain-based online coding tests that are designed by subject-matter experts and experienced programmers. These assessments help recruiters evaluate a candidate’s knowledge in Java programming as well as expertise in coding programs based on language version or project requirements. The salient features of MeritTrac’s coding platform are:

  • Full-stack software development assessment
  • Integrated programming environment
  • Includes a vast library of programming languages
  • Enables project-based testing
  • Consistent coding structure for standardized submissions
  • Auto evaluation

Recruiters who don’t have programming or technical background can also effectively use this user-friendly platform that doesn’t require any installation. The platform authenticates and verifies candidates based on the instructions given. The remote proctoring option ensures that there are no malpractices when the test is being taken. After the test is completed, the tool digitally evaluates the answers and gives you the results. It will also create a rank-based list based on predetermined threshold performance metrics. Based on the analytics reports, recruiters can filter out qualified candidates for the next round of the hiring process.