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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Sample Free Questions

Alert Service

10min
  -  
Easy  
  -  
CODE

Java 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.

User Input

15min
  -  
Easy  
  -  
CODE

Java OOP Public

User interface contains two types of user input controls: TextInput, which accepts all characters and NumericInput, which accepts only digits.

Implement the class TextInput that contains:

  • Public method void add(char c) - adds the given character to the current value
  • Public method String getValue() - returns the current value

Implement the class NumericInput that:

  • Inherits from TextInput
  • Overrides the add method so that each non-numeric character is ignored

For example, the following code should output "10":

TextInput input = new NumericInput();
input.add('1');
input.add('a');
input.add('0');
System.out.println(input.getValue());
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Questions
Utilities, Document Store, Needle, Log Parser, Driver Exam, Crop Ratio, Programmer Teacher, Chicken, Paragraph, Username, Chain Link, Hobbies, Read First Line, Node, Shipping, Racer, Snapshot, Internal Nodes, Moving Total, Entry, Unique Numbers, Remove Repetitions, Max Sum, Unique Name, Friend, Paper Strip, Train, Platformer, Weighted Average, Test Results, Product, Unloading Trucks, Stack to List, Read Write Execute, Shining Star, Document Counter, Snow Storm, Shelf Test, Stories, Rare, Runner, Date Transform, Segment
Skills
Java OOP Bug fixing Language Stream Strings Serialization Exceptions Data structures Arrays Iteration Arithmetic Multithreading Algorithmic thinking Searching Graphs Memory management Refactoring Sorting TDD Test case design Dynamic programming
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