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Java Online Test

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The 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 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.

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.

Binary Search Tree

15min
  -  
Easy  
  -  
CODE

Java Algorithmic thinking Recursion Tree Public

A three-node binary tree.Binary search tree (BST) is a binary tree where the value of each node is larger or equal to the values in all the nodes in that node's left subtree and is smaller than the values in all the nodes in that node's right subtree.

Write a function that, efficiently with respect to time used, checks if a given binary search tree contains a given value.

For example, for the following tree:

  • n1 (Value: 1, Left: null, Right: null)
  • n2 (Value: 2, Left: n1, Right: n3)
  • n3 (Value: 3, Left: null, Right: null)

Call to contains(n2, 3) should return true since a tree with root at n2 contains number 3.

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Premium Questions for 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 Stream Strings Exceptions Arithmetic Algorithmic thinking Memory management Linked list Integer division Regex OOP Refactoring Queue HashMap Iteration Lists Arrays Tree Serialization XML Recursion Data structures Accessibility levels Multithreading Synchronization StringBuilder ArrayList Complexity Stack Stream API Class modifiers Inheritance Sorting Graphs Test case design Unit testing Dynamic programming Higher order function Interfaces HashSet TDD Dynamic Proxy Classes Random Method overriding Abstract class Generics Performance tuning
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Back-End Developer

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