Questions and Answers
What is a class in Java?
A blueprint or template for creating objects
Which of the following statements about objects in Java is true?
Objects are instances of a class
What are attributes in Java?
Attributes are the properties of an object, including fields and methods
What are fields in Java?
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What is the purpose of methods in Java?
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What is encapsulation in Java?
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Study Notes
Java OOP
Java Object-Oriented Programming (OOP) is a paradigm that uses objects to represent and manipulate data. In Java, OOP focuses on creating components that are reusable while maintaining security and ease of use. Key OOP concepts in Java include abstraction, encapsulation, inheritance, and polymorphism.
Class
In Java, a class acts as a blueprint for objects. It defines a set of fields (variables) and methods (functions) that objects of the class will have. A class is a user-defined data type, and an object is a variable of that type.
Objects
Objects are instances of a class. They have their own state, which is represented by the fields in the object's class. Objects can also have behavior, which is represented by the methods in the object's class.
Attributes
Attributes are the properties of an object. They can be fields (data properties) or methods (function properties). Fields store data, while methods define the actions that the object can perform.
Fields
Fields are variables in a class. They store the data associated with an object. For example, a class for a car might have fields for the car's model, make, and color.
Methods
Methods are functions in a class. They define the actions that the object can perform. For example, a class for a car might have methods for starting the engine, accelerating, or stopping.
Encapsulation
Encapsulation is the process of binding data and methods together in a single unit. It helps maintain data security by preventing direct access to the fields of an object.
Conclusion
Java OOP provides a way to create modular, reusable, and maintainable code. By using classes, objects, and attributes, Java allows developers to represent complex systems by breaking them down into smaller components.
