Question

JAVA PROGRAMME
A class called “Gallery” to hold information in an auto gallery catalog
It will be described. “Gallery” class, brand (String) belonging to cars, model (int), price (double), color
(String) will hold the fuel type (String) and body type (String) attributes. Also a class named “Mother”
It will be. Values will be assigned to the properties of the “Gallery” class, and objects will be produced through this class.

a. Write the specified classes in Java programming language.
b. By defining the properties of the cars as public, it is worth these features from the "Main" class.
Make the assignment.
c. If the properties belonging to the cars are defined as private, these properties from the "Main" class
How is the value assigned? What is the name of this technique?
D. What is the constructar method? What are the features of the constructar method? Example above
When we think about it, we can directly assign values to the properties in the catalog.
write the constructar method

sorry for bad english translate :).

Answer 1

Code

if class Gallery has all the attribute public then code is

public class Gallery {
public String brand;
public int model;
public double price;
public String color;
public String fuelType;
public String bodyType;
}

public class Mother {

public static void main(String[] args) {
Gallery car=new Gallery();
car.bodyType="Steel";
car.brand="Marti";
car.color="Balck";
car.fuelType="Petrol";
car.model=2019;
car.price=23000;
}
  
}

you can directly access and assing properties of the Gallery class because  we are declaring the properties to public.

If the properties are declared private then we cant directrly assing the properties of the class we have to use constructor and mutor and accessor methods

Constructor is a special function(method) it is called when the object of the
class is created.

When you creat an object of the class with new keyword on of the constructor is called
this is called default constructor beause it has no perameters.

Constructor is used to initialize the properties of the class.

Example using gallery class is

Gallery class

public class Gallery {
private String brand;
private int model;
private double price;
private String color;
private String fuelType;
private String bodyType;

//parameterized cunstroctor
public Gallery(String brand, int model, double price, String color, String fuelType, String bodyType) {
this.brand = brand;
this.model = model;
this.price = price;
this.color = color;
this.fuelType = fuelType;
this.bodyType = bodyType;
}

  
//mutator methords
public void setBrand(String brand) {
this.brand = brand;
}

  

public void setModel(int model) {
this.model = model;
}

  

public void setPrice(double price) {
this.price = price;
}

  

public void setColor(String color) {
this.color = color;
}

  

public void setFuelType(String fuelType) {
this.fuelType = fuelType;
}

public void setBodyType(String bodyType) {
this.bodyType = bodyType;
}
  
//accessor methods
public String getBodyType() {
return bodyType;
}
public String getFuelType() {
return fuelType;
}
public String getColor() {
return color;
}
public double getPrice() {
return price;
}
public int getModel() {
return model;
}
public String getBrand() {
return brand;
}
}

Mother class

public class Mother {

public static void main(String[] args) {
//creating Gallery class object with the perameter
Gallery car=new Gallery("Maruti",2019,23000,"Black","Petrol","Steel");
  
}
  
}

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