IBS Software Services Java Developer Interview Questions, Process, and Tips

Q1. Spring IOC containers explain
Ans. 
Spring IOC containers are responsible for managing the instantiation of objects and their dependencies in a Spring application.
• IOC stands for Inversion of Control, which means that the control of object creation is inverted from the application code to the Spring framework.

• There are two main types of Spring IOC containers: BeanFactory and ApplicationContext.

• BeanFactory is the simplest container, providing basic support...read more
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Q2. Metaspace in java
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Metaspace is a part of the Java HotSpot VM memory where class metadata is stored.
• Metaspace replaces the permanent generation (PermGen) in Java 8 and later versions.

• It is used to store class metadata such as class names, method names, field names, annotations, etc.

• Metaspace is dynamically resized by the JVM based on the application's demand.

• You can monitor Metaspace usage using tools like JConsole or VisualVM.
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Q3. Difference between prdicate & consumer?
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Predicate is a functional interface that represents a boolean-valued function, while Consumer is a functional interface that represents an operation that accepts a single input argument and returns no result.
• Predicate is used for filtering elements based on a condition, while Consumer is used for performing actions on elements.

• Predicate has a test() method to evaluate a condition, while Consumer has an accept() method ...read more
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Java 8 stream based question

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
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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
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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