Cactus Communications Backend Java Developer Interview Questions and Answers

Q1. Goals for the future
Ans. 
To become a senior Java developer and contribute to innovative projects in a collaborative team environment.
• Continue learning new technologies and best practices in Java development

• Work on challenging projects to enhance problem-solving skills

• Collaborate with team members to share knowledge and improve code quality
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Q2. How do you think you can impact our company
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I believe my strong Java skills and problem-solving abilities can positively impact the company by improving efficiency and developing innovative solutions.
• I have experience in developing efficient and scalable Java applications, which can help streamline processes within the company.

• I am skilled in identifying and solving complex technical issues, which can contribute to the overall success of projects.

• I am proactive ...read more
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Q1. Try, catch, finally...
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Q2. HTTP families (400,200,500)
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Ev vehicles and its advantages and disadvantages

Q1. What are different data types
Ans. 
Different data types represent different types of values that can be stored and manipulated in a programming language.
• Some common data types include integers (e.g. 1, 100), floating-point numbers (e.g. 3.14), strings (e.g. 'hello'), booleans (e.g. true, false), arrays, and objects.

• Data types can also include more complex types like functions, classes, and custom data structures.

• In some programming languages, data types...read more
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Q2. What is call by value and call by reference
Ans. 
Call by value passes a copy of the variable to a function, while call by reference passes the actual variable itself.
• Call by value: a copy of the variable is passed to the function, any changes made inside the function do not affect the original variable

• Call by reference: the actual variable is passed to the function, any changes made inside the function affect the original variable

• Example of call by value: int x = 10;...read more
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Q1. Why String is immutable
Ans. 
String is immutable in Java to ensure security, thread safety, and optimization.
• Immutable strings are thread-safe as they cannot be modified concurrently.

• String pooling allows for memory optimization by reusing existing string objects.

• Immutable strings prevent malicious code from altering sensitive data.

• String immutability simplifies string manipulation and caching implementations.
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Q2. Spring Security
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Q3. Authentication and authorization
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Q4. Java 8 features
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Q1. First question is based on sql query
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Q2. Second they asked oops concepts in java
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Q1. Core java questions
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Q2. Sql basics question
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Q3. Two java coding question
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Q1. Agile/scrum questions
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Q2. Experience related questions
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Q1. Salary expectations
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Online coding 5 question easy to hard time given is 2hrs

Q1. What is hibernate and how we can use it with springboot?
Ans. 
Hibernate is an ORM framework that simplifies database operations in Java applications. It can be integrated with Spring Boot for data persistence.
• Hibernate is an Object-Relational Mapping (ORM) framework that maps Java objects to database tables and vice versa.

• It simplifies database operations by providing a higher-level abstraction for data persistence.

• Spring Boot can be integrated with Hibernate to easily manage dat...read more
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Avg question asked based on dsa.

Q1. Asked thery and 3 DSA problem.
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