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74 interview questionsfor developers (2024)

Test your developer skills before an interview with 74 corrected questions on 80+ topics. Beginner, Intermediate or Expert level.

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74 questions
Hard
8 votes2601 runs0 comment

A Customer class has the com.company.model package.

Back-end developer
inheritance
package
Thomas De verdièreat Jan 4, 2022
Hard
8 votes2565 runs0 comment

How many times is the condition `(a++ < 15)` evaluated in the following code? ```java int a = 3; while (a++ < 15) { if ((a++ % 5) == 0) break; } ```

Back-end developer
loops
control flow
Thomas De verdièreat Dec 16, 2021
Hard
7 votes2504 runs0 comment

A monitor in Java

Back-end developer
java
thread
Thomas De verdièreat Jan 4, 2022
Hard
6 votes2544 runs1 comment

How to write a portable Java program

Back-end developer
java
native
Thomas De verdièreat Jan 4, 2022
Hard
6 votes2526 runs0 comment

Write a finalizer in Java.

Back-end developer
java
finalizer
Thomas De verdièreat Dec 16, 2021
Medium
5 votes2547 runs0 comment

What does the final keyword mean in front of a method in Java?

Back-end developer
java
methods
Thomas De verdièreat Jan 4, 2022
Easy
5 votes2511 runs0 comment

What are the visibility modifiers for a method in Java?

Back-end developer
access modifiers
methods
Thomas De verdièreat Jan 4, 2022
Hard
5 votes2498 runs0 comment

What "design pattern" makes it possible to offer a means of treating the elements of a tree without worrying about the course?

Back-end developer
design pattern
tree
Thomas De verdièreat Jan 4, 2022
Easy
5 votes2487 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
Hard
5 votes2451 runs0 comment

How many instance of Integer cannot be freed from memory?

Back-end developer
array
memory
Thomas De verdièreat Dec 16, 2021
Hard
4 votes2556 runs0 comment

A “synchronized” method

Back-end developer
java
method
Thomas De verdièreat Jan 4, 2022
Hard
4 votes2538 runs1 comment

Serialization can be customized with the Externalizable interface

Back-end developer
serialization
interface
Thomas De verdièreat Jan 4, 2022
Easy
4 votes2508 runs0 comment

What is the classpath for?

Back-end developer
java
classpath
Thomas De verdièreat Jan 4, 2022
Hard
4 votes2507 runs1 comment

A referenced object is an object that can be reached by a “living” thread.

Back-end developer
java
garbage collection
Thomas De verdièreat Jan 4, 2022
Hard
4 votes2471 runs0 comment

What design pattern will you use to dynamically add capabilities to an object in Java?

Back-end developer
design patterns
object
Thomas De verdièreat Jan 4, 2022
Hard
4 votes281 runs1 comment

The Garbage Collector G1(or Garbage First) is a GC that organizes the heap in a way

Back-end developer
garbage collection
java
Loïcat Jan 31, 2022
Hard
3 votes2523 runs0 comment

What is the error message when you try to serialize a class that does not implement Serializable?

Back-end developer
java
serialization
Thomas De verdièreat Dec 2, 2021
Hard
3 votes2518 runs0 comment

Autoboxing allows you to convert an int in Integer, a boolean in Boolean

Back-end developer
java
autoboxing
Thomas De verdièreat Jan 4, 2022
Medium
3 votes2508 runs0 comment

Which executable is used to obtain a thread dump?

Back-end developer
java
jstack
Thomas De verdièreat Jan 4, 2022
Easy
3 votes2500 runs0 comment

Create an instance of ArrayList in Java

Back-end developer
array
list
Thomas De verdièreat Jan 4, 2022