Class And Object Theory in Java
In Java, the concept of classes and objects forms the foundation of object-oriented programming (OOP). Object-oriented programming is a programming paradigm that uses the concept of “objects” to model and organize code. Here’s an explanation of the theory behind classes and objects in Java
Class:
Definition:
A class is a blueprint or a template for creating objects. It defines a set of attributes (fields) and behaviors (methods) that characterize any object created from the class.
In Java, the concept of classes and objects forms the foundation of object-oriented programming (OOP). Object-oriented programming is a programming paradigm that uses the concept of “objects” to model and organize code. Here’s an explanation of the theory behind classes and objects in Java:
Class:
Definition:
A class is a blueprint or a template for creating objects. It defines a set of attributes (fields) and behaviors (methods) that characterize any object created from the class.
Syntax:
java
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public class ClassName {
// Fields (attributes)
dataType fieldName1;
dataType fieldName2;
// …
// Methods (behaviors)
returnType methodName1(parameterType parameterName1, parameterType parameterName2, …) {
// Method body
}
returnType methodName2(parameterType parameterName, …) {
// Method body
}
// …
}
Example:
java
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public class Car {
// Fields
String color;
int speed;
// Methods
void accelerate() {
speed += 10;
}
void brake() {
speed -= 5;
}
}
Object:
Definition:
An object is an instance of a class. It is a concrete realization of the attributes and behaviors defined in the class. Objects are created from classes and represent entities in your program.
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