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Questions and Answers
What is the difference between inheritance and composition in Java?
What is the difference between inheritance and composition in Java?
What is the default access in Java, and which classes have access to it?
What is the default access in Java, and which classes have access to it?
What is the purpose of an abstract class in Java?
What is the purpose of an abstract class in Java?
What is the difference between checked and unchecked exceptions in Java?
What is the difference between checked and unchecked exceptions in Java?
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What is the purpose of serialization in Java?
What is the purpose of serialization in Java?
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What is the difference between inheritance and composition?
What is the difference between inheritance and composition?
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What is the default access modifier in Java?
What is the default access modifier in Java?
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What is the difference between checked and unchecked exceptions?
What is the difference between checked and unchecked exceptions?
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What is the purpose of the finally block in exception handling?
What is the purpose of the finally block in exception handling?
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What is the purpose of serialization in Java?
What is the purpose of serialization in Java?
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Study Notes
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.
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Description
Test your knowledge on inheritance in Java with this quiz! Learn about the concepts of base class and derived class, the differences between inheritance and composition, and the various access modifiers like private and protected. See if you can identify the correct use of the keyword "extends" and understand the limitations of multiple inheritance in Java. Perfect for Java developers looking to strengthen their understanding of inheritance.
