1. Assume the following: A class called Alien includes methods called spawn () and attack() and an attribute health. An Alien object called martian has been properly instantiated. The variable score has been properly declared The following lines of code have no errors and produce the output shown in the box. Alien.spawn (); Alien.spawn (5); System.out.print("Health is:" + martian.getHealth()); Health is: 15 Score Math.sqrt(4) + martian.attack(); System.out.print("Health is: + martian.getHealth()); Health is: 12 Classify each of the following statements regarding as follows: 0 → Statement is definitely FALSE ? → Impossible to tell for sure based on the information provided 1 → Statement is definitely TRUE For each statement below, classify the statement (0, ?, or 1) and briefly explain your reasoning for your answer Statement Classify Rationale spawn () has been overloaded 0 ? 1 spawn () is private 0 ? 1 spawn () returns a double 0 ? 1 spawn () is a void method 0 ? 1 spawn () is a static method 0 ? 1 spawn () modifies an instance variable 0 ? 1

1. Assume the following: A class called Alien includes methods called spawn () and attack() and an attribute health. An Alien object called martian has been properly instantiated. The variable score has been properly declared The following lines of code have no errors and produce the output shown in the box. Alien.spawn (); Alien.spawn (5); System.out.print("Health is:" + martian.getHealth()); Health is: 15 Score Math.sqrt(4) + martian.attack(); System.out.print("Health is: + martian.getHealth()); Health is: 12 Classify each of the following statements regarding as follows: 0 → Statement is definitely FALSE ? → Impossible to tell for sure based on the information provided 1 → Statement is definitely TRUE For each statement below, classify the statement (0, ?, or 1) and briefly explain your reasoning for your answer Statement Classify Rationale spawn () has been overloaded 0 ? 1 spawn () is private 0 ? 1 spawn () returns a double 0 ? 1 spawn () is a void method 0 ? 1 spawn () is a static method 0 ? 1 spawn () modifies an instance variable 0 ? 1

Programming Logic & Design Comprehensive

9th Edition

ISBN:9781337669405

Author:FARRELL

Publisher:FARRELL

Chapter10: Object-oriented Programming

Section: Chapter Questions

Problem 17RQ

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Exercise 7.13 JHTP (Date Class): Create a class called Date that includes 3 instance variables—a month (type int), a day (type int), and a year (type int). Provide a constructor that initializes the 3 instance variables and assumes the values provided are correct. Provide a set and a get method for each instance variable. Provide a method displayDate that displays the month, day, and year separated by forward slashes(/). Write a test application named DateTest that demonstrates class Date’s capabilities. Java code
Exercise 7.13 JHTP (Date Class): Create a class called Date that includes 3 instance variables—a month (type int), a day (type int), and a year (type int). Provide a constructor that initializes the 3 instance variables and assumes the values provided are correct. Provide a set and a get method for each instance variable. Provide a method displayDate that displays the month, day, and year separated by forward slashes(/). Write a test application named DateTest that demonstrates class Date’s capabilities.
1. Create a class called Elevator that can be moved between floors in an N-storey building. Elevator uses a constructor to initialize the number of floors (N) in the building when the object is instantiated. Elevator also has a default constructor that creates a five- (5) storey building. The Elevator class has a termination condition that requires the elevator to be moved to the main (i.e., first) floor when the object is cleaned up. Write a finalize() method that satisfies this termination condition and verifies the condition by printing a message to the output, Elevator ending: elevator returned to the first floor. In main(), test at least five (5) possible scenarios that can occur when Elevator is used in a building with many floors (e.g., create, move from one floor to another, etc.). Hint: Termination occurs when the instance is set to null. You may wish to investigate “garbage collection” for this exercise. When solving this problem make sure that the user can interact with the…
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Create a class called Complex for performing arithmetic with complex numbers. Complex numbershave the form realPart + imaginaryPart * i where i is √-1Write a java program to test your class. Use floating-point variables to represent the private data of theclass. Provide a constructor that enables an object of this class to be initialized when it is declared.Provide a no-argument constructor with default values in case no initializers are provided. Providepublic methods that perform the following operations:a) Add two Complex numbers: The real parts are added together and the imaginary parts are addedtogether.b) Subtract two Complex numbers: The real part of the right operand is subtracted from the realpart of the left operand, and the imaginary part of the right operand is subtracted from theimaginary part of the left operand.c) Print Complex numbers in the form (a, b), where a is the real part and b is the imaginary part Sample Output: a=(9.5 , 7.7) b)=(1.2 , 3.1) a+b=(10.7 , 10.8)…
Create a class called Invoice that a hardware store might use to represent an invoice for an item sold at the store. An Invoice should include four information as instance variables: a part number (type String), a part description (type String), a quantity of the item being purchased (type int) and a price per item (double). Your class should have a constructor that initializes the four instance variables. Provide a set and a get method for each instance variable. In addition, provide a method named getInvoiceAmount that calculates the invoice amount (i.e., multiplies the quantity by the price per item), then returns the amount as a double value. If the quantity is not positive, it should be set to 0. If the price per item is not positive, it should be set to 0.0. Write a tester class named InvoiceTest that demonstrates class Invoice’s capabilities by creating two invoices then changing and printing their characteristics.
3- Create a class named Player with a default name as "player", a default level as 0, and a default class type of "fighter". Feel free to add any other attributes you wish! Create an instance method in the Player class called attack that takes another player as a parameter. This function should compare the level of the two players, and return whether the player won, lost, or tied. Finally create a loop that allows the user to input a name and a class type for two players; the level of both players should be determined at random (between 1 and 99). Print out the name and attributes of each player, and have the first player attack the second. Print whether the player won, lost, or tied. Ask if the user wants to try again. (Python code)
Assume that you have created a class named MyClass, and that a working program contains the following statement:output MyClass.numberWhich of the following do you know?a. number is a numeric field.b. number is a static field.c. number is an instance variable.d. all of the above
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Create a class called Date that includes three instance variables-a month (type int), a day (type int) and a year (type int). Provide a constructor that initializes the three instance variables and assumes that the values provided are correct. Provide a set and a get method for each instance variable. Provide a method displayDate that displays the month, day and year separated by forward slashes (/). Add a main method to the class that demonstrates class Date's capabilities.