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49 interview questionsfor Application developer (2026)

Test your technical skills before an interview of Application developer with 49 corrected questions. Beginner, Intermediate or Expert level.

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49 questions
Easy
40 votes3388 runs
13 comments

Write a Java program that prints 'welovedev'.

Full stack developer
strings
variables
Pierreat Sep 19, 2022
Easy
17 votes3279 runs
2 comments

How should a package be named in Java?

Full stack developer
packages
java
Pierreat Sep 19, 2022
Medium
15 votes2037 runs
1 comment

What is the difference between an interface and an abstract class in Java?

Full stack developer
EL Mostafa Fadiliat Feb 13, 2024
Easy
14 votes1692 runs0 comment

Is the following code valid? class Person { constructor(name, age) { this.name = name; this.age = age; } } const person = new Person('John', 20); console.log(person.name); console.log(person.age);

IT Architect
OOP
javascript
undefined
Eric Hostaleryat Dec 3, 2021
Easy
11 votes3173 runs0 comment

Add elements to an ArrayList in Java

Full stack developer
arrays
lists
java
Pierreat Jan 4, 2022
Easy
11 votes3116 runs
2 comments

How to concatenate two strings of characters in Java?

Full stack developer
strings
concatenation
Pierreat Jan 4, 2022
Easy
9 votes3489 runs0 comment

Which of these classes is the most suitable for composing a character string from several elements concatenated to each other?

Back-end developer
string
java
Thomas De verdièreat Jan 4, 2022
Easy
9 votes3199 runs0 comment

Are arrays primitives types in Java?

Full stack developer
arrays
primitives
Pierreat Sep 19, 2022
Easy
9 votes709 runs0 comment

You need to develop a class for which there should be only one instance throughout your application. Which design pattern should you use for this?

IT Architect
OOP
design pattern
singleton
Jean ALbin ELieat Mar 28, 2023
Medium
8 votes1571 runs0 comment

Can we extend an abstract class in Java?

IT Architect
OOP
abstract
class
Eric Hostaleryat Dec 3, 2021
Easy
7 votes2975 runs0 comment

What does `--` do in Java?

Full stack developer
operators
Pierreat Jan 4, 2022
Medium
7 votes2588 runs
9 comments

What are the modifiers that cannot be used with enums in Java?

Full stack developer
enums
Xiaoyuat May 12, 2023
Hard
7 votes1645 runs0 comment

Which design pattern allows to dynamically add responsibilities to an object?

IT Architect
OOP
design pattern
object
Eric Hostaleryat Sep 19, 2022
Easy
7 votes1543 runs
3 comments

Compare two strings in Java

Full stack developer
EL Mostafa Fadiliat Apr 8, 2024
Easy
6 votes3025 runs
3 comments

Write a valid code comment in Java

Full stack developer
comments
java
Pierreat Jan 4, 2022
Easy
6 votes2049 runs
1 comment

Given the following code, what will be displayed in the console?

Full stack developer
operators
modulo
Abderrazzak ATIFIat Nov 3, 2023
Easy
6 votes1682 runs0 comment

What Java keyword is used to define a constant variable?

Full stack developer
EL Mostafa Fadiliat Mar 27, 2024
Easy
6 votes1022 runs
3 comments

What is the benefit of using a ReentrantLock in Java?

Full stack developer
synchronisation
verrouillage
Anonymous authorat Dec 26, 2024
Hard
5 votes3604 runs0 comment

Given the class InputStream, which of the following statements are true: It is defined in java.io., It is an abstract class.

Back-end developer
java
io
Thomas De verdièreat Jan 4, 2022
Easy
5 votes3071 runs
3 comments

What is “AssertEquals” used for in a Java Unit test?

Full stack developer
java
unit test
Pierreat Jan 4, 2022
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