A class in Java is a template that defines the properties and behaviors of an object. It is the basic building block of an object-oriented language.
For example, a class called “Car” might have properties such as make, model, color, and year. It could also have behaviors such as start, accelerate, brake, and turn. The class would define how these properties and behaviors are related.
A constructor is a special method that is used to create and initialize an object. It is called when an object is created and is usually used to set up the initial state of the object. For example, the constructor of a class might set the default values for the properties of the object.
A method is a subroutine or function associated with a class. It is used to perform an action or to retrieve data. For example, a method of a class might be used to calculate the area of a rectangle or to retrieve a specific record from a database.
Structs and classes are the two fundamental building blocks of object-oriented programming in Swift.
Structs are value types, meaning they are copied when they are passed around in your code. Structs are best used when you need to encapsulate a few relatively simple data values. For example, a struct to represent a size might look like this:
struct Size {
var width: Float
var height: Float
}
Classes, on the other hand, are reference types, meaning that when they are passed around in your code, only a reference to the instance is passed. Classes are best used when you need to model more complex behavior. For example, a class to represent a car might look like this:
class Car {
var make: String
var model: String
var year: Int
var color: String
func start() {
// code to start the car
}
}
A class in Java is a template that is used to create objects, and to define the properties and behaviors of those objects.
For example, a Car class could be used to create objects that represent individual cars. The Car class would specify the properties of a car, like its make, model, and color, as well as the behaviors, like accelerate, brake, and turn.
public class Car {
// Properties of the class…
private String make;
private String model;
private int year;
private String color;
// Constructor of the class…
public Car(String make, String model, int year, String color) {
this.make = make;
this.model = model;
this.year = year;
this.color = color;
}
// Methods of the class…
public void accelerate() {
System.out.println(“Vroom!”);
}
public void brake() {
System.out.println(“Screech!”);
}
public void turn(String direction) {
System.out.println(“Turning ” + direction + “.”);
}
}
Vaibhav Kothia