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Core Java Online Test

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The core Java online test assesses candidates' knowledge of programming in the Java language and their ability to leverage commonly used parts of the Java Class Library.

It's an ideal test for pre-employment screening. A good Java developer needs to be able not only to solve problems using Java but also recognize when to leverage the functionality provided by the Java Class Library to write robust and maintainable code.

This online test requires candidates to solve coding problems in Java and find and fix bugs in a Java program.

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Free Sample Questions for Core Java Test

Our sample questions are free for companies to use on a trial plan. See more about our premium questions for paid plans below.

Cache Casting

3min
  -  
Easy  
  -  
MCA

Java Inheritance OOP Public

A company is designing the class hierarchy for various cache implementations:

public class Cache {}

public class DiskCache extends Cache {}

public class MemoryCache extends Cache {}

public class OptimizedDiskCache extends DiskCache {}

Select all the answers that will result in a runtime exception.

(Select all acceptable answers.)

Alert Service

10min
  -  
Easy  
  -  
CODE

Java Interfaces Inversion of Control Refactoring Public

Refactor the AlertService and MapAlertDAO classes:

  • Create a new package-private interface, named AlertDAO, that contains the same methods as MapAlertDAO.
  • MapAlertDAO should implement the AlertDAO interface.
  • AlertService should have a constructor that accepts AlertDAO.
  • The raiseAlert and getAlertTime methods should use the object passed through the constructor.

Merge Names

10min
  -  
Easy  
  -  
CODE

Java Arrays Public

Implement the uniqueNames method. When passed two arrays of names, it will return an array containing the names that appear in either or both arrays. The returned array should have no duplicates.

For example, calling MergeNames.uniqueNames(new String[]{'Ava', 'Emma', 'Olivia'}, new String[]{'Olivia', 'Sophia', 'Emma'}) should return an array containing Ava, Emma, Olivia, and Sophia in any order.

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Premium Questions for Core Java Test

TestDome offers a premium questions library with 1000+ unique, hand-crafted questions whose answers can’t be found online. If you spot an answer somewhere online, we’ll give you a refund.

Covered Skills

Testing of these skills is covered in this pre-built test because they’re closely related. On our paid plan, you can easily create your own custom multi-skill tests.

Java Bug Fixing Language Exceptions Arithmetic Algorithmic Thinking Strings Linked List OOP Refactoring Queue HashMap Iteration Lists Recursion Tree Regex Data Structures Accessibility Levels StringBuilder ArrayList Stream API Class Modifiers Inheritance Sorting Graphs Test Case Design Unit Testing Dynamic Programming HashSet TDD Dynamic Proxy Classes Multithreading Synchronization Method Overriding Arrays Integer Division Abstract Class Performance Tuning Random Generics Complexity Stack Higher Order Function Interfaces Serialization XML Stream Memory Management
Recommended Job Roles

These are the job roles that we recommend for the Core Java online test.

Java Developer

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