i do not understand why this is happening pls help
package com.codegym.task.task05.task0525;
/*
The whole duck isn't enough
*/
public class Solution {
public static void main(String[] args) {
Duck duck1 = new Duck();
Duck duck2 = new Duck();
System.out.println(duck1);
System.out.println(duck2);
Cat cat1 = new Cat(cat1);
Cat cat2 = new Cat(cat2);
System.out.println(cat1);
System.out.println(cat2);
Dog dog1 = new Dog();
Dog dog2 = new Dog();
System.out.println(dog1);
System.out.println(dog2);
}
public static class Duck {
public String toString() {
return "Duck";
}
}
public static class Cat {
public String toString() {
return "Cat";
}
}
public static class Dog {
public String toString() {
return "Dog";
}
}
}