Java Inheritance Quiz

Inheritance vs Composition in Java

• Inheritance is a mechanism where a subclass inherits properties and behavior from a parent class.
• Composition is a mechanism where an object is composed of other objects or collections of objects.
• Inheritance represents "is-a" relationship, whereas composition represents "has-a" or "part-of" relationship.

Access Modifiers in Java

• Default access modifier is package-private, which means it can be accessed within the same package.
• Classes with access to default access modifier are classes within the same package.

Abstract Classes in Java

• An abstract class is a class that cannot be instantiated and is used to provide a common base class for a group of related classes.
• Purpose of an abstract class is to provide a blueprint for subclasses, allowing them to share common attributes and methods.

Exception Handling in Java

• Checked exceptions are exceptions that are checked by the compiler at compile-time, and must be handled or declared.
• Unchecked exceptions are exceptions that are not checked by the compiler at compile-time, and do not need to be handled or declared.
• The purpose of the finally block is to execute important code regardless of whether an exception is thrown or not.

Serialization in Java

• Serialization is the process of converting an object into a byte stream, allowing it to be written to a file or sent over a network.
• Purpose of serialization is to persist the state of an object or transfer it between systems.