Constructor problem

john_meee

I have a problem with constructors ... I never understood how they work. At Caine c=new Caine(); Animal c1=new Caine(); Pisica p=new Pisica(); Error: Constructor Caine in Caine class cannot be applied to given class

package test2;
public class Test2 {

 public static void main(String\[\] args) {
     ListaAnimale lista= new ListaAnimale();
     Caine c=new Caine();   
     Animal c1=new Caine();        
     Pisica p=new Pisica();
     lista.adauga(c);
     lista.adauga(p);
     c.faceZgomot();
 }

}
class ListaAnimale{
private Animal [] animale = new Animal[5];
private int index=0;
public void adauga(Animal a){
if(index

TorstenH

Caine c=new Caine(); // That constructor does not exist
Animal c1=new Caine(); // That constructor does not exist
Pisica p=new Pisica();// That constructor does not exist

Your constructors are demanding some values:

public Caine(String n, int a){ // String and Int is required to initalize
super(n,a);
}

so your main would initalize those as following:

Caine c=new Caine("String", 0);
Animal c1=new Caine("anotherString", 1);
Pisica p=new Pisica("oneMoreString", 2);

Constructors are not that complicated. it's just some OOP as in any other method that you write. http://docs.oracle.com/javase/tutorial/java/javaOO/constructors.html[^]

regards Torsten I never finish anyth...

vipul574

At Caine c=new Caine(); Animal c1=new Caine(); Pisica p=new Pisica(); These 3 statements wont work. As you can see, your program does not have no-arg constructor. when you dont write any constructor, then compiler will include a default no-arg constructor. If you are explicitly writing a constructor then default constructor wont be added. You have to write your own default no-arg constructor. Then the above lines will run successully.

Regards Vipul

Tushar Guru

Hi, you can learn "All About Constructors in Java" from here. It is the best and simple one.