Question

How to use constructor overloading in Java

Answer 1

class Car {
    public String manufacturer;
    public String model;
    public float price;
    
    public Car(String _manufacturer, String _model, float _price) { // constructor
        manufacturer = _manufacturer;
        model = _model;
        price = _price;
    }
    
    public Car() { // constructor
        manufacturer = "unknown";
        model = "unknown";
        price = 0;
    }
    
    public void print() {
        System.out.println(manufacturer + " " + model + " " + price);
    }
}
public class JavaApplication {
     
    public static void main(String[] args) {
 
        Car m1 = new Car("Audi", "2016 Audi SQ5", 53000);
        Car m2 = new Car();
         
        m1.print();
        m2.print();
    }
}
 
 
 
/*
run:
 
Audi 2016 Audi SQ5 53000.0
unknown unknown 0.0
 
*/

 

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Answer 2

class Worker {
    public int id;
    public String name;
   
    public Worker(int _id, String s) { // constructor
        id = _id;
        name = s;
    }
    public Worker() { // constructor
        id = 74893;
        name = "a name";
    }
    public void Show() {
        System.out.println("ID = " + id + " : " + "Name = " + name);
    }
}
 
public class MyClass {
    public static void main(String args[]) {
        Worker w1 = new Worker(12343, "Dumbledore");
        Worker w2 = new Worker();
         
        w1.Show();
         
        w2.Show();
    }
}
 
 
 
 
/*
run:
 
ID = 12343 : Name = Dumbledore
ID = 74893 : Name = a name
 
*/

 

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