add a default constructor in abstract class

I have a java code :

Code :

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        abstract class Fish{
            abstract void Display();
        }
        abstract class FreshWaterFish extends Fish{
        }
        abstract class SaltWaterFish extends Fish{
        }
        class Tombro extends FreshWaterFish{
            @Override
            void Display() {
                System.out.println("Tombro");
            }
        }
        class Salmon extends SaltWaterFish{
            @Override
            void Display() {
                System.out.println("Salmon");
            }}
        class Tuna extends SaltWaterFish{
            @Override
            void Display() {
                System.out.println("Tuna");
        }}
        public class InstanceOfClass {
            public final static int NUMIKAN=4;
            public static void main(String g[]){
                Fish Fish[] = new Fish[NUMIKAN] ;
                Fish[0]=new Tombro();
                Fish[1]=new Tuna();
                Fish[2]=new Salmon();
                Fish[3]=new Tombro();
               for(int i=0; i<NUMIKAN; i++){
                    Fish MyFish = Fish[i];
                    if (MyFish instanceof SaltWaterFish) {
                        MyFish.Display();
        }}}}

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I just want to learn, how should adding a default constructor on FreshWaterFish and SaltWaterFish class, so it displays the output:


Fresh Water Fish
Salt Water Fish
Salt Water Fish
Fresh Water Fish
Tuna
Salmon


Thanks guys for your reply ! :o

Quote:

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Originally Posted by Kifli

I just want to learn, how should adding a default constructor on FreshWaterFish and SaltWaterFish class, so it displays the output:
Fresh Water Fish
Salt Water Fish
Salt Water Fish
Fresh Water Fish
Tuna
Salmon

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Code :

---

//Abstract Subclass of Fish
 
        abstract class FreshWaterFish extends Fish{
 
        	public FreshWaterFish()
        	{
        		System.out.println("FreshWaterFish");
        	}
        }
 
//Abstract Subclass of Fish
 
        abstract class SaltWaterFish extends Fish{
 
        	public SaltWaterFish()
        	{
        		System.out.println("SaltWaterFish");
        	}
        }

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