Data Structures and Algorithms in Java
6th Edition
ISBN: 9781118771334
Author: Michael T. Goodrich
Publisher: WILEY
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Textbook Question
Chapter 2, Problem 12R
Draw a class inheritance diagram for the following set of classes:
- Class Goat extends Object and adds an instance variable tail and methods milk() and jump().
- Class Pig extends Object and adds an instance variable nose and methods eat(food) and wallow().
- Class Horse extends Object and adds instance variables height and color, and methods run() and jump().
- Class Racer extends Horse and adds a method race().
- Class Equestrian extends Horse and adds instance variable weight and isTrained, and methods trot() and isTrained().
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Draw a class inheritance diagram for the following set of classes:
• Class Goat extends Object and adds an instance variable tail and methods milk() and jump().
• Class Pig extends Object and adds an instance variable nose and methods eat(food) and wallow().
• Class Horse extends Object and adds instance variables height and color, and methods run() and jump().
• Class Racer extends Horse and adds a method race().
• Class Equestrian extends Horse and adds instance variable weight and isTrained, and methods trot() and
isTrained().
Draw a class diagram consisting of a base class named Person and a derived class named Student consist of :
Encapsulation
Polymorphism
Inheritance
Base classes vs Derived classes
Protected Access vs Packaged Access & Abstract Methods and Classes
Class Relationships Exercises
1. In Java, we use inheritance for "is-a" relationships. Containment, on the other hand, indicates that one object has another object. These are "has-a" relationships.
For the following relationships, determine if they are a "is-a" or a "has-a" relationship:
o bicycle - vehicle
o car - engine
o pizza - topping
o food - pizza
o dog - mammal
2. Share with someone else 3 other examples for each of the following relationships:
o Inheritance ("is-a" relationship)
o Containment ("has-a" relationship)
3. public class PersonInfo {
protected String firstName;
protected String birthdate;
}
public class ChildInfo extends PersonInfo {
private String schoolName;
}
public class MotherInfo extends PersonInfo {
private String spousename;
private ChildInfo children1;
private ChildInfo children2;
private ChildInfo children3;
...
}
A. Draw the relationships for the classes above using UML. If a class inherits from another class, draw an open arrow pointing to the base class…
Chapter 2 Solutions
Data Structures and Algorithms in Java
Ch. 2 - Give three examples of life-critical software...Ch. 2 - Give an example of a software application in which...Ch. 2 - Prob. 3RCh. 2 - Prob. 4RCh. 2 - Prob. 5RCh. 2 - Give a short fragment of Java code that uses the...Ch. 2 - Prob. 7RCh. 2 - Prob. 8RCh. 2 - Prob. 9RCh. 2 - Prob. 10R
Ch. 2 - Prob. 11RCh. 2 - Draw a class inheritance diagram for the following...Ch. 2 - Prob. 13RCh. 2 - Prob. 14RCh. 2 - If the parameter to the makePayment method of the...Ch. 2 - Prob. 16CCh. 2 - Most modern Java compilers have optimizers that...Ch. 2 - The PredatoryCreditCard class provides a...Ch. 2 - Modify the PredatoryCreditCard class so that a...Ch. 2 - Prob. 20CCh. 2 - Write a program that consists of three classes, A,...Ch. 2 - Prob. 22CCh. 2 - Prob. 23CCh. 2 - Write a Java class that extends the Progression...Ch. 2 - Redesign the Progression class to be abstract and...Ch. 2 - Use a solution to Exercise C-2.25 to create a new...Ch. 2 - Use a solution to Exercise C-2.25 to reimplement...Ch. 2 - Write a set of Java classes that can simulate an...Ch. 2 - Write a Java program that inputs a polynomial in...Ch. 2 - Write a Java program that inputs a document and...Ch. 2 - Prob. 31PCh. 2 - Write a Java program that simulates a system that...Ch. 2 - Define a Polygon interface that has methods area()...Ch. 2 - Prob. 35PCh. 2 - Write a Java program that can make change. Your...
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- 1. Using inheritance design and implement the following classes. Write a complete program to set attributes values of the objects of Employee and Worker classes. Employee name Employee() getname() Worker salary Worker() getsalary()arrow_forwardJavaarrow_forwardDraw a UML class diagram for the following three classes to show their structures and relationships.arrow_forward
- The mechanism of deriving a class from another derived class is known as? A. Polymorphism B. Single Inheritance C. Multilevel Inheritance D. Message Passing Justify your answer with explanationsarrow_forwardINTRO JAVA Problem 1 Implement a superclass Person. Make two classes, Student and Instructor, that inherits from Person. A person has a name and a year of birth. A student has a major, and an instructor has a salary. Write the class declarations, the constructors, and the methods toString & equals for all classes. Supply a test program for these classes and methods. Problem 2 Make a class Employee with a name and salary. Make a class Manager that inherits from Employee. Add an instance variable, named department, of type String. Make a class Executive inherit from Manager. Implement toString and equals methods for all classes; supply a test program that tests these classes and methods toString() method should print all the properties of the class; as Name and DOB is same for both student and instructor, you can implement it in the superclass "Person" Problem 1 Create 3 students Student1 : Name James, DOB: 01/01/2000, Major: English Student2: Name Jane, DOB:…arrow_forwardUsing c++ Design a Wacky class that can be used to generate a message based on the information passed to it. The class should have a single integer private member variable: int num; Design the complete class so that if: an object is created with no parameters; num is initialized to 10. an object is created with 1 parameter that is an integer; num is initialized to the integer that is passed *2 an object is created with 1 parameter that is a double; num is initialized to the double *4 an object is created with 2 parameters, a char and a string; it prints the message "That's WACKY!"arrow_forward
- Q# In the company example, a supervisor has a supervisee. This “has-a” relationship is called: Group of answer choices 1. parent 2. composition 3. extending 3. inheritancearrow_forwardConsider the following detailed inheritance hierarchy diagram: (ATTACHED IN IMAGE) The person constructor has two string parameters, a first name, and the last name. The constructor initializes the e-mail address to the first letter of the first name followed by the first five letters of the last name followed by @jc.com. If the last name has fewer than five letters, the e-mail address will be the first letter of the first name followed by the entire late name followed by @jc.com A) Implement the person constructor: B) Override Object's toString method for the Person class. The toString method should return the present state of the object. Assume that the constructor writer for the previous part of this problem works as intended. C) Write both the Person and Student class headers so that the Student is a subclass of Person.arrow_forwardDefining Classes Write and document the definition for the Money class. The Money class represents an amount in U.S. dollars. Money Class e Fields cents : int dollars : int e Methods getValue() : double Money(int d, int c) setCents(int c) : void setDollars(int d) : void toString() : String • Each Money object has two int instance variables: dollars and cents. • The class has one constructor that takes two int parameters. The first int represents whole dollars, and the second int represents cents. • The class has one accessor method named getValue() which returns the amount as a double. (Just divide cents by 100.0 and add it to dollars. Return that amount.) • The class has two mutator methods-setDollars() and setCents()–that modify the corresponding instance variables. • The class has a toString() method that returns the amount as a String in the form: $ 2345.75. Use concatenation to produce the output. Do not worry about the decimal places.arrow_forward
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