Java Algorithms Online Test
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Sign Up To Use This TestThe Java Algorithms online test assesses candidates' algorithmic-thinking skills and their ability to implement algorithms using Java.
It's an ideal test for pre-employment screening. A good developer will be able to design and implement algorithms that are both correct and efficient. Computational complexity is important not only when scaling applications but when creating responsive, maintainable, and efficient code.
This online test requires candidates to analyze or design an algorithm using Java as the programming language.
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Sample Candidate Report
Sample Free Questions
Alert Service
10min
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Easy
Easy
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CODE
Java
Interfaces
Inversion of control
Refactoring
Public
Java
The Java programming language is a simple, modern, general-purpose, object-oriented programming language. Having a basic familiarity with the programming language used on the job is a prerequisite for quickly getting up to speed.
Interfaces
An interface is used to define an abstract type that defines behaviors as method signatures. Instances of different types can implement the same interface and provide a way for a developer to reuse the code.
Inversion of control
Inversion of Control (IoC) is a pattern that is used to invert different kinds of controls in object-oriented design to achieve loose coupling. Developers should know how to use it in order to increase modularity of the program and make it extensible.
Refactoring
The process of restructuring existing computer code without changing its external behavior. It is essential for keeping code readable and maintainable.
Public
Public questions (free account) are common interview questions. They are great for practicing, or if you want to filter candidates using the classic problems.
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
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Easy
Easy
-
CODE
Java
Arrays
Public
Java
The Java programming language is a simple, modern, general-purpose, object-oriented programming language. Having a basic familiarity with the programming language used on the job is a prerequisite for quickly getting up to speed.
Arrays
An array is a container of a fixed number of objects of a similar type. It is a fundamental component of most programming languages.
Public
Public questions (free account) are common interview questions. They are great for practicing, or if you want to filter candidates using the classic problems.
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
Easy
-
CODE
Java
Algorithmic thinking
Recursion
Tree
Public
Java
The Java programming language is a simple, modern, general-purpose, object-oriented programming language. Having a basic familiarity with the programming language used on the job is a prerequisite for quickly getting up to speed.
Algorithmic thinking
When designing and/or analyzing an algorithm or data structure, it is important to consider the performance and structure of an implementation. Algorithmic thinking is one of the key traits of a good programmer, especially one working on complex or performance-critical code.
Recursion
A good programmer should be familiar with when to use recursive functions, since they can provide elegant solutions for complex problems.
Tree
A tree is a hierarchical structure defined recursively starting with the root node, where each node is a data structure consisting of a value, together with a list of references to other nodes (the "children"). A lot of problems can be solved efficiently with trees, which makes them important for developers.
Public
Public questions (free account) are common interview questions. They are great for practicing, or if you want to filter candidates using the classic problems.
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.
Premium Questions
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Questions
Max Sum, Paper Strip, Unloading Trucks, Veterinarian, Internal Nodes, Platformer, Remove Repetitions, Unique Product, Unique Numbers, Book Sale, Friend, Moving TotalSkills
JavaJava
The Java programming language is a simple, modern, general-purpose, object-oriented programming language. Having a basic familiarity with the programming language used on the job is a prerequisite for quickly getting up to speed.
Algorithmic thinking
When designing and/or analyzing an algorithm or data structure, it is important to consider the performance and structure of an implementation. Algorithmic thinking is one of the key traits of a good programmer, especially one working on complex or performance-critical code.
Arrays
An array is a container of a fixed number of objects of a similar type. It is a fundamental component of most programming languages.
Sorting
Every programmer should be familiar with data-sorting methods, as sorting is very common in data-analysis processes.
Queue
A queue is a collection of items that are maintained in a sequence and can be modified by the addition of entities at one end of the sequence and removal from the other end of the sequence. It is the collection to be used when first-in-first-out (FIFO) collection is needed.
Tree
A tree is a hierarchical structure defined recursively starting with the root node, where each node is a data structure consisting of a value, together with a list of references to other nodes (the "children"). A lot of problems can be solved efficiently with trees, which makes them important for developers.
Data structures
Choosing the right data structure to solve a problem can have huge implications on the performance of an application. Knowing when to use a specific data structure is one of the most important skills for a programmer.
Linked list
A linked list is a linear collection of data elements where each element points to the next. It is a data structure consisting of a collection of nodes which together represent a sequence. It is usually used for advanced scenarios where we need fast access to the next element, or when we need to remove an element from anywhere in the collection.
StringBuilder
Since a string is an immutable data structure, concatenating multiple strings can introduce significant performance penalties. Every experienced developer should know when to use StringBuilder instead of simply concatenating two strings to improve performances in such scenarios.
Strings
The string data structure is used to represent text. It is one of the most commonly used data structures. Therefore, every programmer should be skilled at string manipulation.
HashMap
A HashMap (or dictionary) is a data type composed of a collection of key-value pairs, where each possible key appears at most once in the collection. It is used when we need to access items by their keys.
Graphs
Many real-life situations are best modeled by graphs. Therefore, an in-depth knowledge of graph data structures is important for a good programmer.
HashSet
HashSet is container that stores unique elements in no particular order. This allows for fast checks to see if a value was already added.
Score Distribution
# of candidates
| 0-33% | |
|---|---|
| 34-66% | |
| 67-100% |
Score