23 interview questions for Software engineer (2026)

Hard

17 votes3672 runs

1 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

14 votes3683 runs1 comment

Serialization can be customized with the Externalizable interface

Back-end developer

serialization

interface

Thomas De verdièreat Jan 4, 2022

Hard

14 votes3608 runs0 comment

A monitor in Java

Back-end developer

java

thread

Thomas De verdièreat Jan 4, 2022

Hard

14 votes3507 runs0 comment

How many instance of Integer cannot be freed from memory?

Back-end developer

array

memory

Thomas De verdièreat Dec 16, 2021

Hard

12 votes3703 runs0 comment

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

Back-end developer

inheritance

package

Thomas De verdièreat Jan 4, 2022

Hard

11 votes3555 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

Medium

9 votes3457 runs2 comments

What does the following code show?

Back-end developer

java

variable

Thomas De verdièreat Jan 4, 2022

Hard

8 votes3651 runs0 comment

Write a finalizer in Java.

Back-end developer

java

finalizer

Thomas De verdièreat Dec 16, 2021

Hard

7 votes3673 runs

3 comments

How to write a portable Java program

Back-end developer

java

native

Thomas De verdièreat Jan 4, 2022

Easy

7 votes3565 runs

2 comments

What package contains the HashMap class in Java?

Back-end developer

java

hashmap

Thomas De verdièreat Jan 4, 2022

Easy

7 votes3537 runs0 comment

Create an instance of ArrayList in Java

Back-end developer

array

list

Thomas De verdièreat Jan 4, 2022

Hard

7 votes3532 runs1 comment

What is the superclass of Integer, Long, Byte, BigDecimal and Short in Java?

Back-end developer

java

superclass

Thomas De verdièreat Jan 4, 2022

Medium

6 votes3602 runs0 comment

Create an instance of HashMap in Java

Back-end developer

hashmap

map

null

Thomas De verdièreat Jan 4, 2022

Hard

6 votes3557 runs0 comment

How to create a class in Java with a version number of 14.

Back-end developer

java

class

Thomas De verdièreat Dec 3, 2021

Medium

6 votes3548 runs0 comment

A “garbage collection” in Java

Back-end developer

garbage collection

Thomas De verdièreat Jan 4, 2022

Hard

5 votes3592 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 votes3577 runs1 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

Easy

5 votes3569 runs0 comment

Which executable is used to obtain a thread dump?

Back-end developer

java

jstack

Thomas De verdièreat Jan 4, 2022

Hard

4 votes3625 runs

4 comments

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

Easy

4 votes3514 runs0 comment

Write a more appropriate name for this interface

Back-end developer

interfaces

java

Thomas De verdièreat Jan 4, 2022

23 interview questionsfor Software engineer (2026)

Test your technical skills before an interview of Software engineer with 23 corrected questions. Beginner, Intermediate or Expert level.

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; } ```

Serialization can be customized with the Externalizable interface

A monitor in Java

How many instance of Integer cannot be freed from memory?

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

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

What does the following code show?

Write a finalizer in Java.

How to write a portable Java program

What package contains the HashMap class in Java?

Create an instance of ArrayList in Java

What is the superclass of Integer, Long, Byte, BigDecimal and Short in Java?

Create an instance of HashMap in Java

How to create a class in Java with a version number of 14.

A “garbage collection” in Java

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

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

Which executable is used to obtain a thread dump?

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

Write a more appropriate name for this interface