Questions from Starting Out With Java

Q: Is it advisable or not advisable to write a method that returns

Is it advisable or not advisable to write a method that returns a reference to an object that is a private field? What is the exception to this?

Q: Look at the following declaration: enum Color { RED,

Look at the following declaration: enum Color { RED, ORANGE, GREEN, BLUE} 1. What is the name of the data type declared by this statement? 2. What are the enum constants for this type? 3. Write a stat...

Q: Why should you use StringBuilder objects instead of String objects in a

Why should you use StringBuilder objects instead of String objects in a program that makes lots of changes to strings?

Q: Each of the numeric wrapper classes has a static toString method.

Each of the numeric wrapper classes has a static toString method. What do these methods do?

Q: What is an “is-a†relationship?

What is an “is-a†relationship?

Q: What is an abstract class?

What is an abstract class?

Q: When you instantiate an anonymous inner class, the class must do

When you instantiate an anonymous inner class, the class must do one of two things. What are they?

Q: What is a lambda expression?

What is a lambda expression?

Q: What is the superclass and what is the subclass in the following

What is the superclass and what is the subclass in the following line? public class Pet extends Dog

Q: Can a subclass ever directly access the private members of its superclass

Can a subclass ever directly access the private members of its superclass?