Homework Assignment 5 Solution

Formatting: Each class must reside in its own file. If you need to instantiate objects of class A in your class B, your B.java file must import A.java first. The names you choose for your classes should match the ones specified in each problem. Also, for each problem i, you must have a Problem_i.java file containing (only) the class which has the main method. Finally, you must put all files related to problem i into a folder named problem_i. The files must be placed in the right sub-folder. Make sure that your code complies. See the note in Problem 1 for an example.




Submission: For each problem i submit one problem_i.zip file to Blackboard. The zip file should maintain the structure of the sub-folders. See the note in Problem 1 for an example.







Problem 1 [50pts]. You are interested in keeping track of the team members and compe-tition information for your school’s annual entries in computer science programming compe-titions. Each team consists of exactly four team members. Every year your team competes in two competitions. As an initial start for your database, create a class named Team that has the following instance variables:




Name for the team String teamName;
Names for each team members.



String name1, name2, name3, name4;




Info on each competition Competition competition1, competition2;



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The class should also have a method that outputs the names of all team members and the competition information to the console. The Competition class contains variables to track the following:




String: Name of the competition,




String: Name of the winning team,




String: Name of the runner-up




Integer: Year of the competition




Implement the Team and Competition classes with appropriate constructor, accessor, and mutator methods. Write some tests.




In entering data for past competitions, you note that an entry is usually very similar to the previous year’s entry. To help with the data entry, create a deep copy constructor for the Team class. Test your copy constructor by creating a copy of an existing team object, changing the competition information for the copy, and outputting the data for the original and the copy. The original object should be unchanged if your deep copy constructor is working properly.




Note: For this problem you must submit three files Team.java, Competition.java and Problem_1.java. The last one contains the main method (in public class Problem_1). Put the files in their correct subdirectories and compress them into problem_1.zip and submit to Blackboard. The same rules are to be followed for the remaining problems (in this and future assignments) unless otherwise specified.




Problem 2 [40pts]. Create a class to represent a container. The class Container should have the following properties




Maximum capacity of the container in liters.



Quantity of liquid at any given time in liters.



The following operations can be performed on the containers:




Completely fill a container.



Completely empty a container.



Transfer liquid from one container to another.



Define the class named Container that implements the properties and operations defined below. Create a constructor of the Container class that allows the user to specify the max-imum capacity of the container in liters. Initially, assume that all the containers are empty.




Implement the following methods in the Container class.




quantity() to return the current quantity of liquid at any given time in liters.



leftOver() to return the quantity of liquid that can be filled in the current container before it is full.



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full() to fill the current container fully.



empty() to make the container completely empty.



transfer() to transfer a certain amount of liquid from one container to another.



displayQuantity() to display the current quantity in liters.



Note: While transferring liquid from one container to another, check the maximum capacity of the container.




Problem 3 [50pts]. Define a class for rational numbers. A rational number is a number that can be represented as the quotient of two integers. For example, 12 , 34 , 642 , and so forth are all rational numbers. Represent rational numbers as two values of type int, one for the numerator and one for the denominator. Your class should have two instance variables of type int. Call the class Rational. Include a constructor with two arguments that can be used to set the instance variables of an object to any values. Also include a constructor that has only a single parameter of type int; call this single parameter whole and define the constructor so that the object will be initialized to the rational number whole1 . Also include a no-argument constructor that initializes an object to 0 (that is, to 0 ). Note that the numerator, the denominator, or both may contain a minus sign. Define0 methods for addition, subtraction, multiplication, and division of objects of your class Rational. These methods should use a calling object and a single argument. For example, the add method (for addition) has a calling object and one argument. So r1.add(r2) returns the result of adding the rationals r1 and r2. Define accessor and mutator methods as well as the methods equals and toString. You should include a method, normalize, to normalize the sign of the rational number so that the denominator is positive and the numerator is either positive or negative. For example, after normalization, 48 would be represented the same as 84 . Also write a test program to test your class.


















































































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