This Java Online Test
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About the test

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.

Sample public questions

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.

Java
Inheritance
OOP
Easy
3 min
mca
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 public constructor that accepts AlertDAO.
  • The raiseAlert and getAlertTime methods should use the object passed through the constructor.
Java
Interfaces
Inversion of Control
Refactoring
Easy
10 min
code
Public

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Kera Lafleur

Java and SQL

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50 more premium Java questions

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Skills and topics tested

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

For job roles

  • Back-End Developer
  • Java Developer
  • Web Developer

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