How finally used under Exception Handling?

Java Programming Language > Fundamentals of Object-Oriented Programming > Object-Oriented Paradigm

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Answer:

The finally keyword is used to create a block of code that follows a try block. A finally block of code always executes, whether or not an exception has occurred.

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93. What things should be kept in mind while creating your own exceptions in Java?

Answer: While creating your own exception ?

All exceptions must be a child of Throwable.

If you want to write a checked exception that is automatically enforced by the Handle or Declare Rule, you need to extend the Exception class.

You want to write a runtime exception, you need to extend the RuntimeException class.

# Tutorial: Object-Oriented Paradigm

Question: Fundamentals of Object-Oriented Programming Short

94. Define Inheritance?

Answer:

It is the process where one object acquires the properties of another. With the use of inheritance the information is made manageable in a hierarchical order.

Inheritance is a concept in object-oriented programming (OOP) that allows new classes to be based on existing classes.
The existing class is called the "parent class" or "base class", while the new class is called the "child class" or "derived class".
Through inheritance, the child class can inherit some or all of the properties and methods of the parent class.
The child class can reuse the properties and methods of the parent class, allowing for code reuse and reducing redundancy.
The child class can also add new properties and methods or override existing ones to modify the behavior of the parent class.
Inheritance allows for the creation of class hierarchies, where each level inherits from the level above it.
Inheritance can lead to more efficient and organized code, as well as easier maintenance and updates.
Inheritance is a key concept in OOP and is widely used in many programming languages, including Java, C++, and Python.
Examples of inheritance in action include a parent class called "Animal" with child classes called "Dog" and "Cat", where each child class inherits common properties and methods from the parent class while also having their own specific properties and methods.

# Tutorial: Object-Oriented Paradigm

Question: Fundamentals of Object-Oriented Programming Short

95. When super keyword is used?

Answer:

If the method overrides one of its superclass's methods, overridden method can be invoked through the use of the keyword super. It can be also used to refer to a hidden field.

# Tutorial: Object-Oriented Paradigm

Question: Fundamentals of Object-Oriented Programming Short

96. What is Polymorphism?

Answer: Polymorphism is the ability of an object to take on many forms. The most common use of polymorphism in OOP occurs when a parent class reference is used to refer to a child class object.

# Tutorial: Object-Oriented Paradigm

Question: Fundamentals of Object-Oriented Programming Short

97. What is Abstraction?

Answer: It refers to the ability to make a class abstract in OOP. It helps to reduce the complexity and also improves the maintainability of the system.

# Tutorial: Object-Oriented Paradigm

Question: Fundamentals of Object-Oriented Programming Short

98. What is Abstract class?

Answer: These classes cannot be instantiated and are either partially implemented or not at all implemented. This class contains one or more abstract methods which are simply method declarations without a body.

# Tutorial: Object-Oriented Paradigm

Question: Fundamentals of Object-Oriented Programming Short

99. When Abstract methods are used?

Answer: If you want a class to contain a particular method but you want the actual implementation of that method to be determined by child classes, you can declare the method in the parent class as abstract.

# Tutorial: Object-Oriented Paradigm

Question: Fundamentals of Object-Oriented Programming Short

100. What is Encapsulation?

Answer:

It is the technique of making the fields in a class private and providing access to the fields via public methods. If a field is declared private, it cannot be accessed by anyone outside the class, thereby hiding the fields within the class. Therefore encapsulation is also referred to as data hiding.

Encapsulation is one of the four fundamental concepts of Object-Oriented Programming (OOP) and is a mechanism that binds together code and data, hiding the implementation details and making them inaccessible to other objects outside the encapsulated object. In Java, encapsulation is achieved through the use of classes and access modifiers (public, private, protected) which control the visibility of class members (methods and variables). This allows data to be protected from outside influences, promotes code reusability, and enhances security by ensuring that data can only be accessed or modified in a controlled manner.

# Tutorial: Object-Oriented Paradigm

Question: Fundamentals of Object-Oriented Programming Short

101. What is the primary benefit of Encapsulation?

Answer:

The main benefit of encapsulation is the ability to modify our implemented code without breaking the code of others who use our code. With this Encapsulation gives maintainability, flexibility and extensibility to our code.

The primary benefit of encapsulation is data hiding and protection. It helps to restrict access to the internal workings of a class and protect the data from accidental or intentional corruption. Encapsulation also promotes the modularity of code and encourages the design of reusable and maintainable software. By encapsulating data and behavior within objects, encapsulation provides the foundation for building robust and secure software systems.

# Tutorial: Benefits of OOP

Question: Fundamentals of Object-Oriented Programming Short

102. What is an Interface?

Answer:

An interface is a collection of abstract methods. A class implements an interface, thereby inheriting the abstract methods of the interface.

In Java, an interface is a blueprint of a class that contains only abstract methods (methods without a body) and constant fields. An interface is used to define a common behavior for multiple classes, allowing them to work together. Interfaces provide a way to achieve abstraction in Java and are used to define a contract that must be implemented by concrete classes. By implementing an interface, a class agrees to perform the behavior specified in the interface. Interfaces can also be extended by other interfaces, making it possible to define a hierarchy of behaviors.

# Tutorial: Introduction to Interface

Question: Interface in java Short

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