Tespa Infotech Java Developer Interview Questions and Answers for Freshers

Q1. Callable vs runnable?
Ans. 
Callable is used to return a result and can throw checked exceptions, while Runnable is used for void operations.
• Callable can return a result and throw checked exceptions, while Runnable cannot.

• Callable is a functional interface with a method call() that returns a result, while Runnable is a functional interface with a method run() that does not return a result.

• Example: Callable task = () -> { return 5 + 3; }; Runnable...read more
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Q2. Functional interface
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Q3. Java 8 features
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Q4. Solid principle
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Q5. Which design pattern to use for complex design?
Ans. 
Use the Strategy design pattern for complex design.
• Strategy pattern allows you to define a family of algorithms, encapsulate each one, and make them interchangeable.

• It helps in separating the behavior of a class from the class itself, making it easier to switch between different algorithms at runtime.

• Examples of using Strategy pattern include implementing different sorting algorithms in a class or defining various paym
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Q1. Oops concept , core java
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Q2. Hibernate, springboot, micrroservices
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Q1. Questions related to Java 1.8, Java Core, and Spring Boot.
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Q2. Questions related to Git, and Agile.
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Q1. JPA Hibernate related question
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Q2. Object oriented Programming questions
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Q1. What are oops concept?
Ans. 
Object-oriented programming concepts that focus on data encapsulation, inheritance, polymorphism, and abstraction.
• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Inheritance: Ability of a class to inherit properties and behavior from another class.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the complex implementation details and s
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