C-Edge Technologies 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. Explain SQL join
Ans. 
SQL join is used to combine rows from two or more tables based on a related column between them.
• SQL join is used to retrieve data from multiple tables based on a related column.

• Types of SQL joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.

• INNER JOIN returns rows when there is at least one match in both tables.

• LEFT JOIN returns all rows from the left table and the matched rows from the right table.

• RIGHT JO...read more
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Q2. Write down how many common you know in Linux
Ans. 
I know several common Linux commands used for system administration and troubleshooting.
• ls - list directory contents

• cd - change directory

• pwd - print working directory

• cp - copy files and directories

• mv - move/rename files and directories

• rm - remove/delete files and directories

• grep - search for patterns in files

• chmod - change file permissions

• sudo - execute a command as a superuser

• top - display and update sorted informatio...read more
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Q1. Basic Sql interview questions.
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Q2. Related to projects which is mentioned in resume.
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