C-Edge Technologies Java Developer Interview Questions, Process, and Tips

Some coding questions

Q1. What is exception propogation in java?
Ans. 
Exception propagation in Java is the process of passing an exception from one method to another in the call stack.
• Exceptions can be thrown in a method and propagated up the call stack until they are caught and handled.

• If an exception is not caught in a method, it will be propagated to the calling method.

• This continues until the exception is caught or reaches the top of the call stack.

• Example: If a method 'A' calls meth...read more
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Q2. Expalin JDBC and return type of statement?
Ans. 
JDBC is a Java API for connecting and executing SQL queries on databases. The return type of a statement in JDBC is boolean.
• JDBC stands for Java Database Connectivity.

• It allows Java programs to interact with databases using SQL queries.

• The return type of a statement in JDBC is boolean, indicating whether the query was successfully executed.
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Q1. Why Strings are immutable in java?
Ans. 
Strings are immutable in Java to ensure thread safety, security, and optimization.
• Immutable strings are thread-safe as they cannot be modified concurrently by multiple threads.

• Immutable strings enhance security by preventing malicious code from altering the string content.

• String interning is possible due to immutability, allowing for memory optimization.

• Examples: String str = "Hello"; str.concat(" World"); // This does
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Q2. What is difference between runnable and callable in java?
Ans. 
Runnable is a functional interface with a run() method, while Callable is a functional interface with a call() method that can return a result or throw an exception.
• Runnable does not return a result or throw a checked exception, while Callable can return a result or throw a checked exception.

• Callable is used in scenarios where you need to return a result or handle checked exceptions, while Runnable is used for simple t...read more
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Q1. How does spring auto configuration works?
Ans. 
Spring auto configuration automatically configures Spring beans based on classpath and property settings.
• Spring scans classpath for certain annotations like @Component, @Service, @Repository, @Controller, etc.

• Based on these annotations and property settings, Spring automatically configures beans.

• Auto configuration can be customized using @Conditional annotations or configuration classes.

• Example: @SpringBootApplication ...read more
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Q2. Second level cache in hibernate?
Ans. 
Second level cache in Hibernate is used to cache data at the session factory level to reduce database hits.
• Second level cache stores objects across sessions to reduce database calls

• Improves performance by reducing database hits

• Configurable cache providers like Ehcache, Infinispan can be used
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Q1. What was your role in your team?
Ans. 
I was responsible for designing and developing Java applications, collaborating with team members, and troubleshooting issues.
• Designed and developed Java applications according to project requirements

• Collaborated with team members to ensure smooth project execution

• Troubleshooted and resolved any issues that arose during development
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Q2. Tell me about transaction management in spring.
Ans. 
Transaction management in Spring helps in managing database transactions in a consistent and reliable manner.
• Spring provides support for both programmatic and declarative transaction management.

• Programmatic transaction management involves handling transactions in code using TransactionTemplate or PlatformTransactionManager.

• Declarative transaction management involves using annotations like @Transactional to define trans...read more
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Q1. Return type of add method?
Ans. 
The return type of the add method depends on the specific implementation and requirements of the program.
• Return type can be int, double, void, or any other data type depending on what the method is supposed to do.

• For example, an add method for adding two integers may have a return type of int.

• If the add method is simply updating a value and not returning anything, the return type may be void.
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Q2. What spring boot annotations you used and how?
Ans. 
I have used annotations like @RestController, @Autowired, @RequestMapping, @Service, @Component, @Repository in Spring Boot.
• Used @RestController to define RESTful web services.

• Used @Autowired to inject dependencies.

• Used @RequestMapping to map web requests to specific handler methods.

• Used @Service to mark a class as a service component.

• Used @Component to mark a class as a Spring component.

• Used @Repository to mark a clas
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Q3. Tell me about your previouse projects
Ans. 
I have worked on various projects including e-commerce websites, financial management systems, and mobile applications.
• Developed an e-commerce website using Java Spring framework

• Implemented financial management system with Java EE technologies

• Created mobile applications using Android Studio and Java
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Q4. How to optimize queries
Ans. 
Optimizing queries involves using indexes, limiting result sets, avoiding unnecessary joins, and optimizing database schema.
• Use indexes on columns frequently used in WHERE clauses

• Limit result sets by using pagination or filtering

• Avoid unnecessary joins by denormalizing data or using subqueries

• Optimize database schema by reducing redundancy and normalizing data
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Q5. What is thread safety
Ans. 
Thread safety ensures that shared data is accessed and modified by multiple threads in a safe and consistent manner.
• Thread safety is important in multi-threaded programming to prevent race conditions and ensure data integrity.

• It can be achieved through synchronization mechanisms like locks, mutexes, and atomic operations.

• For example, using synchronized keyword in Java to protect critical sections of code from concurren
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Q1. Resume-related questions
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Q1. Resume-related questions
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Q1. HR discussions round !
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