Mindfire Solutions Java Developer Interview Questions and Answers

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. 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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Q1. What you do? Description with analysis
Ans. 
I am a Java Developer responsible for designing, developing, and maintaining Java applications.
• Design and develop Java applications

• Write clean, efficient, and maintainable code

• Collaborate with team members to troubleshoot and solve technical issues
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Q1. Java,sql,python
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Q1. What is your goal
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Find min ,max and second largest (avoid duplicates)using streams

Q1. Multiple inheritance , encapsulation, Collections-Hashmap,Set,list etc with coding questions, substrings,
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Q2. Checked and unchecked expections with example
Ans. 
Checked exceptions are checked at compile time, while unchecked exceptions are not.
• Checked exceptions must be either caught or declared in the method signature using 'throws'

• Unchecked exceptions do not need to be caught or declared

• Example of checked exception: IOException

• Example of unchecked exception: NullPointerException
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Q3. Spring boot annotations
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Q4. Java 8 features,stream api,lambda with coding
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Q1. How to implement spring security in spring boot application
Ans. 
Implementing Spring Security in a Spring Boot application involves configuring security settings and adding dependencies.
• Add spring-boot-starter-security dependency in pom.xml

• Create a class extending WebSecurityConfigurerAdapter to configure security settings

• Use @EnableWebSecurity annotation to enable Spring Security

• Define authentication and authorization rules in configure(HttpSecurity http) method
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Q1. If your thoughts conflict with your co-worker, how would you handle the situation?
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Count occurrence using hashmap

Q1. Static, Exception handling, Threads
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