1. Why should you define a method toString in the classes you create? 2. If you define a parameterized constructor for a class, must you define a default constructor? Explain. 3. Implement a class...

1. Why should you define a method toString in the classes you create?

2. If you define a parameterized constructor for a class, must you define a default constructor? Explain.

3. Implement a class Counter whose objects count things. An object of this class records a count as a nonnegative integer. Include methods to set the counter to 0, to increase the counter by 1, and to