Hello i defined the following Fish class with the following private attributes(basically its just a class that contains a string indicting the type of fish and an integer containing its size in centimeters. I also created get methods for each attribute,a constructor that takes the size and species of the fish and a toString() method that returns a string in the following format: A 10cm Pike ):
public class Fish
{
private int size;
private String species;
public int getSize()
{
return this.size;
}
public String getSpecies()
{
return this.species;
}
public Fish(int s, String p)
{
size = s;
species = p;
}
public String toString()
{
return("A " + this.size + " cm " + this.species);
}
}
Then I defined a Pond class that defines the following private attributes:
fish - an array which will contain all Fish objects that are in the pond
numFish - an int indicating the # of fish that are currently in the pond
and this what I did: (if I am wrong please let me know)
public class Pond
{
private int numFish;
private Fish [] fishes;
}
now what I am having trouble with in particular is creating a constructor that takes the capacity of the pond, where the capacity is the maximum number of fish that can be stored in the pond at any time. I am not really sure how to create an array as a parameter of a constructor. Also I am having trouble with creating a method called isFull() which returns a boolean indicating whether or not the pond has reached its capacity of fish. Any help is appreciated, thank you so much!
So, you want a constructor that takes a capacity as argument:
public Pond(int capacity)
And the capacity is thus the length of the array used to store the fishes:
public Pond(int capacity) {
this.fishes = new Fish[capacity];
}
Arrays, like almost everything else, are covered in the Java tutorial. Googling for "Java tutorial arrays" finds it in an instant: http://docs.oracle.com/javase/tutorial/java/nutsandbolts/arrays.html
Now, when is the pond full? It seems to me that it's full if the number of fishes is equal to its capacity:
public boolean isFull() {
return numFish == fishes.length;
}
You have to make the constructor like that or you can make the setter methods in your Pond class
public Pond(int capacity) {
this.fishes = new Fish[capacity];
}
and you can create isFull method logic like
if (numFish == capacity)
{
System.out.println("Pond is full");
}
Use a constructor similar to the following:
public Pond(int numberOfFish)
{
numFish=numberOfFish;
fishes=new Fish[numberOfFish];
}
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