Starting Out with Java: From Control Structures through Objects (7th Edition) (What's New in Computer Science)
7th Edition
ISBN: 9780134802213
Author: Tony Gaddis
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 6.4, Problem 6.20CP
Program Plan Intro
Constructor:
The constructor functions are the special member functions which are designed to initialize the data members of a class. The constructor functions are automatically called by the compiler when declaring the object for the class.
- Constructor creates and initializes objects that don’t even exist yet.
- Constructors are called implicitly.
- Constructor name should be same as class name.
- The java compiler always provides a default constructor if the program does not have any.
- Constructor does not have a return type.
Explanation of Solution
b. Creating object for the class “ClassAct”:
The name of the class that the constructor “ClassAct” appears in is “ClassAct”. This is because; the constructor name should be same as class name...
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
Assume that the following is a constructor, which appears in a class:ClassAct(int number){item = number;}a) What is the name of the class that this constructor appears in?b) Write a statement that creates an object from the class and passes the value 25 as an argument to the constructor.
(Date Class) Create a class called Date that includes three pieces of information as datamembers—a month (type int), a day (type int) and a year (type int). Your class should have a constructor with three parameters that uses the parameters to initialize the three data members. For thepurpose of this exercise, assume that the values provided for the year and day are correct, but ensurethat the month value is in the range 1–12; if it isn’t, set the month to 1. Provide a set and a get function for each data member. Provide a member function displayDate that displays the month, dayand year separated by forward slashes (/). Write a test program that demonstrates class Date’s capabilities.
True or False It is legal to write a class without any constructors.
Chapter 6 Solutions
Starting Out with Java: From Control Structures through Objects (7th Edition) (What's New in Computer Science)
Ch. 6.1 - What does an object use its fields for?Ch. 6.1 - Prob. 6.2CPCh. 6.1 - How is a class like a blueprint?Ch. 6.1 - You have programs that create Scanner, Random, and...Ch. 6.1 - Prob. 6.5CPCh. 6.1 - What values do reference variables hold?Ch. 6.1 - Prob. 6.7CPCh. 6.2 - You hear someone make the following comment: A...Ch. 6.2 - Prob. 6.9CPCh. 6.2 - When a variable is said to reference an object,...
Ch. 6.2 - Prob. 6.11CPCh. 6.2 - Prob. 6.12CPCh. 6.2 - Prob. 6.13CPCh. 6.2 - Prob. 6.14CPCh. 6.2 - Prob. 6.15CPCh. 6.2 - What is a stale data item?Ch. 6.3 - Assume that r1 and r2 are variables that reference...Ch. 6.4 - How is a constructor named?Ch. 6.4 - What is a constructors return type?Ch. 6.4 - Prob. 6.20CPCh. 6.7 - Prob. 6.21CPCh. 6.7 - What is a methods signature?Ch. 6.7 - Look at the following class: public class...Ch. 6.7 - How many default constructors may a class have?Ch. 6.9 - Prob. 6.25CPCh. 6.9 - When designing an object-oriented application, who...Ch. 6.9 - How do you identify the potential classes in a...Ch. 6.9 - What are a classs responsibilities?Ch. 6.9 - What two questions should you ask to determine a...Ch. 6.9 - Will all of a classs actions always be directly...Ch. 6 - This is a collection of programming statements...Ch. 6 - A class is analogous to a(n) _______. a. house b....Ch. 6 - An object is a(n) ________. a. blueprint b....Ch. 6 - This is a class member that holds data. a. method...Ch. 6 - This key word causes an object to be created in...Ch. 6 - This is a method that gets a value from a classs...Ch. 6 - This is a method that stores a value in a field or...Ch. 6 - When the value of an item is dependent on other...Ch. 6 - This is a method that is automatically called when...Ch. 6 - When a local variable has the same name as a...Ch. 6 - This is automatically provided for a class if you...Ch. 6 - Prob. 12MCCh. 6 - Prob. 13MCCh. 6 - A classs responsibilities are __________. a. the...Ch. 6 - True or False: The new operator creates an...Ch. 6 - True or False: Each instance of a class has its...Ch. 6 - True or False: When you write a constructor for a...Ch. 6 - True or False: A class may not have more than one...Ch. 6 - True or False: To find the classes needed for an...Ch. 6 - Find the error in the following class: public...Ch. 6 - Prob. 2FTECh. 6 - The following statement attempts to create a...Ch. 6 - Find the error in the following class: public...Ch. 6 - Find the error in the following class: public...Ch. 6 - Design a class named Pet, which should have the...Ch. 6 - Look at the following partial class definition,...Ch. 6 - Consider the following class declaration: public...Ch. 6 - Look at the following description of a problem...Ch. 6 - The bank offers the following types of accounts to...Ch. 6 - Assume that you are writing an application that...Ch. 6 - What is the difference between a class and an...Ch. 6 - A contractor uses a blueprint to build a set of...Ch. 6 - What is an accessor method? What is a mutator...Ch. 6 - is it a good idea to make fields private? Why or...Ch. 6 - If a class has a private field, what has access to...Ch. 6 - Prob. 6SACh. 6 - Assume a program named MailList.java is stored in...Ch. 6 - Why are constructors useful for performing...Ch. 6 - Under what circumstances does Java automatically...Ch. 6 - What do you call a constructor that accepts no...Ch. 6 - Prob. 11SACh. 6 - How does method overloading improve the usefulness...Ch. 6 - Employee Class Write a class named Employee that...Ch. 6 - Car Class Write a class named Car that has the...Ch. 6 - Personal Information Class Design a class that...Ch. 6 - Retail Item Class Write a class named RetailItem...Ch. 6 - Payroll Class Design a Payroll class that has...Ch. 6 - TestScores Class Design a TestScores class that...Ch. 6 - Circle Class Write a Circle class that has the...Ch. 6 - Temperature Class Write a Temperature class that...Ch. 6 - Days in a Month Write a class named MonthDays, The...Ch. 6 - A Game of Twenty-One For this assignment, you will...Ch. 6 - Freezing and Boiling Points The following table...Ch. 6 - SavingsAccount Class Design a SavingsAccount class...Ch. 6 - Deposit and Withdrawal Files Use Notepad or...Ch. 6 - Patient Charges Write a class named Patient that...Ch. 6 - Dice Game Write a program that uses the Die class...Ch. 6 - Roulette Wheel Colors On a roulette wheel, the...Ch. 6 - Coin Toss Simulator Write a class named Coin. The...Ch. 6 - Tossing Coins for a Dollar For this assignment you...Ch. 6 - Fishing Game Simulation For this assignment, you...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.Similar questions
- C++ Write a class named Time It must have three private integer members named hours, mins and secs It must have a public constructor that sets the default time, hours, mins and secs to zero It must have two public member functions that are return type void. They must be settime with three integer arguments – this will allow the main function to reset the hours, mins and secs. show data with no arguments – this will allow the main function to display the time to the console. Use the main program as shown below to test your output against the output shown below:int main() { Time a, b, c (8,20,10); // declare 3 objects b.settime(1,8,3); // assign values to b's data members a.showdata(); // display object a's values b.showdata(); // display object b's values c.showdata(); // display object c's values return 0; }arrow_forwardPersonal Information ProgramDevelop a program, in which you’ll design a class that holds the following personal data: name, address, age, and phone number. As part of the program, you’ll then create appropriate accessor and mutator methods. Also, set up three instances of the class. One instance should hold your information, and the other two should hold your friends’ or family members’ information.Input: data for the following attributes of 3 instances of the Personal Information Class: name, address, age, and phone number NOTE: The input data do not need to be real data; they need to be entered at the keyboard, when program is run.Processing: Develop the following: Personal Information Class A program that creates three instances of the above class Output:Set up a loop and display data within each object: name, address, age, and phone numberarrow_forwardT F The public members of a class may be directly accessed from functions that are inside (part of the classarrow_forward
- True or False The get accessor can be thought of as a method that returns the class property’s value.arrow_forward(Constructors and Destructors) What happens when a return type, even void, is specifiedfor a constructor or destructor?arrow_forwardBoats For problems A, B, and C you will be writing two different classes to simulate a Boat race. Problem A is to write the first class Boat. A Boat object must hold the following information boat_name: string top_speed: int current_progress: int Write a constructor that allows the programmer to create an object of type Boat with the arguments boat_name and top_speed. The boat_name should be set to the value of the corresponding argument - this argument is required. The top_speed should default to the value 3 if no value is passed in for the argument. The value for current_progress should always be set to 0. Implement Boat class with setter and getter methods: Provide setters for the following instance variables: set_top_speed takes in an int and updates the top_speed set_boat_name takes in a string and updates the boat_name set_current_progress takes in a int and updates the current_progress Provide getters for the following instance variables with no input parameters…arrow_forward
- C++ Assume that box 1 is an object of a class called Rectangle. Assume that the statement Rectangle box2 = box1 is executed. Which of the following statements is false? a) the default constructor for the Rectangle class is called for box2. b) memberwise assignment occurs unless Rectangle has a copy constructor c) the copy constructor for the Rectangle class is called if Rectangle has a copy constructorarrow_forwardC# (Odd or Even) Write an app that reads an integer, then determines and displays whether it’s odd or even. (Hints: use the remainder operator) (Multiples) Write an app that reads two integers, determines whether the first is a multiple of the second, and displays the result. (Hints: use the remainder operator). Create a class called Date that includes three pieces of information as auto-implemented properties: a month (type int), a day (type int), and a year (type int). Your class should have a constructor that initializes the three fields. Provide a method DisplayDate() that displays the three fields (separated by '/'). Write a test app named DateDemo that demonstrates class Date’s capabilities.arrow_forward(Rational Numbers) Create a class called Rational for performing arithmetic with fractions. Write a program to test your class. Use integer variables to represent the private instance variables of the class—the numerator and the denominator. Provide a constructor that enables an object of this class to be initialized when it's declared. The constructor should store the fraction in reduced form. The fraction 2/4 is equivalent to 1/2 and would be stored in the object as 1 in the numerator and 2 in the denominator. Provide a no-argument constructor with default values in case no initializers are provided. Provide public methods that perform each of the following operations: a) Add two Rational numbers: The result of the addition should be stored in reduced form. Implement this as a static method. b) Subtract two Rational numbers: The result of the subtraction should be stored in reduced form. Implement this as a static method.…arrow_forward
- Month Class Exceptions Write a class named Month. The class should have an int field named monthNumber that holds the number of the month. For example, Janauary would be 1, February would be 2, and so forth. In addition, provide the following methods: A no-arg constructor that sets the monthNumber field to 1. A constructor that accepts the number of the month as an argument. It should set the monthNumber value to the value passed as the argument. If a value less than 1 or greater than 12 is passed, the constructor should throw an InvalidMonthNumberException. A constructor that accepts the name of the month, such as “January” or “February”, as an argument. It should set the monthNumber field to the correct corresponding value. If an invalid name is passed, the constructor should throw an InvalidMonthNameException. A setMonthNumber method that accepts an int argument, which is assigned to the monthNumber field. If a value less than 1 or greater than 12 is passed, throw an…arrow_forwardA Mutator function within a class must have access to the private data item but Accessor functions should not. True False Question 32 4 pts The private and public areas of a class can appear in any order. In other words the public declarations or private declarations can come first...it does not matter. True Falsearrow_forwardTIME CLASS (C++) - Write a time class named timeClass - Write code to demonstrate that it works - The timeclass class will be named timeClass - The class must have these 3 constructors: #1) timeClass(); #2) timeClass(int h, int m, int s); #3) timeClass (string timeIn); - The string constructor must be capable of being separated by colons or blanks time in the 24-hour format: example 23:11:07 or 9:4:9 or 11 31 27 - DO NOT use some system functions for this assignment. You must write the code. - Yes, you can convert from string to integer stoi ( string). - In addition to the constructors, you should supply a set of getters (Accessors) getH, getM getS - In addition to that, add mutators that allow the individual setting of Hours, Minutes and Seconds: setH(int), setM ( int ) setS( int ) Include this setter ( Mutator) setTime( int NumSeconds); - So if I call setTime( 7673) you would know that that is: -- hours, -- minutes and -- seconds seconds = 53 7673 % 60…arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Programming Logic & Design ComprehensiveComputer ScienceISBN:9781337669405Author:FARRELLPublisher:CengageMicrosoft Visual C#Computer ScienceISBN:9781337102100Author:Joyce, Farrell.Publisher:Cengage Learning,EBK JAVA PROGRAMMINGComputer ScienceISBN:9781337671385Author:FARRELLPublisher:CENGAGE LEARNING - CONSIGNMENT
Programming Logic & Design Comprehensive
Computer Science
ISBN:9781337669405
Author:FARRELL
Publisher:Cengage
Microsoft Visual C#
Computer Science
ISBN:9781337102100
Author:Joyce, Farrell.
Publisher:Cengage Learning,
EBK JAVA PROGRAMMING
Computer Science
ISBN:9781337671385
Author:FARRELL
Publisher:CENGAGE LEARNING - CONSIGNMENT