TechPro Education Java Interview Questions

Java Interview Questions

1) What is Polymorphism in Java?

The same method performing different tasks in different classes

Explanation: Polymorphism allows an object to behave in different ways. In Java, examples include method overriding and method overloading.

2) Which library is used to connect to databases in Java?

java.sql

3) What are lambda expressions and functional interfaces in Java? Explain with an example.

Lambda expressions are used to create anonymous functions. A Functional Interface is an interface that contains only one method. Lambda expressions are used to implement these interfaces.

4) How is memory management done in Java and how does garbage collection work?

Memory management in Java is based on heap and stack memory areas. Garbage collection is performed by the JVM, which cleans up unused objects from memory. The garbage collector automatically removes objects that have no references.

5) What are autoboxing and unboxing in Java?

Autoboxing is the automatic conversion of primitive types to their corresponding wrapper classes. For example, converting an int value to an Integer object. Unboxing is the conversion of a wrapper class object back to its primitive type. For example, converting an Integer object to an int value.

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