Objects First with Java: A Practical Introduction Using BlueJ (6th Edition)
6th Edition
ISBN: 9780134477367
Author: David J. Barnes, Michael Kolling
Publisher: PEARSON
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Chapter 4, Problem 54E
Program Plan Intro
To define a method in the Club class.
Write a program in BlueJ to define a method in the Club class named:
public int (joinedlnMonthfint month)
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1- Random Prime Generator
Add a new method to the Primes class called genRandPrime. It should take as input two
int values: 1owerBound and upperBound. It should return a random prime number in
between TowerBound (inclusive) and upperBound (exclusive) values. Test the functionality
inside the main method.
Implementation steps:
a) Start by adding the method header. Remember to start with public static keywords,
then the return type, method name, formal parameter list in parenthesis, and open brace. The
return type will be int. We will have two formal parameters, so separate those by a comma.
b) Now, add the method body code that generates a random prime number in the specified
range. The simplest way to do this is to just keep trying different random numbers in the range,
until we get one that is a prime. So, generate a random int using:
int randNum = lowerBound + gen.nextInt(upperBound);
Then enter put a while loop that will keep going while randNum is not a prime number - you
can…
ToNearestPenny (amount)-a private static method that returns
the given amount rounded to the nearest penny. For example, if the
amount is 1023.659, the method will return 1023.66.
2. Consider a class Time that represents a time of day. It has attributes for the
hour and minute. The hour value ranges from 0 to 23, where the range 0 to
11 represents a time before noon. The minute value ranges from 0 to 59.
a. Write a default constructor that initializes the time to 0 hours, O minutes.
b. Write a private method isValid (hour, minute) that returns true if the
given hour and minute values are in the appropriate range.
C. Write a method setTime (hour, minute) that sets the time if the given
values are valid.
d. Write another method setTime (hour, minute, iSAM) that sets the time
if the given values are valid. The given hour should be in the range I to 12.
The parameter isAm is true if the time is an a.m. time and false otherwise.
3. Write a default constructor and a second constructor for…
Chapter 4 Solutions
Objects First with Java: A Practical Introduction Using BlueJ (6th Edition)
Ch. 4 - Prob. 1ECh. 4 - What happens if you create a new MusicOrganizer...Ch. 4 - Prob. 3ECh. 4 - Prob. 4ECh. 4 - Write a declaration of a local variable called...Ch. 4 - Prob. 6ECh. 4 - Write assignments to the library, cs101. and track...Ch. 4 - If a collection stores 10 objects, what value...Ch. 4 - Write a method call using get to return the fifth...Ch. 4 - Prob. 10E
Ch. 4 - Write a method call to add the object held in the...Ch. 4 - Write a method call to remove the third object...Ch. 4 - Suppose that an object is stored at index 6 in a...Ch. 4 - Add a method called checklndex to the...Ch. 4 - Write an alternative version of checkIndex called...Ch. 4 - Rewrite both the 1istFi1e and removeFi1e methods...Ch. 4 - Prob. 17ECh. 4 - Prob. 18ECh. 4 - We know that the first file name is stored at...Ch. 4 - Prob. 20ECh. 4 - Create a MusicOrganizer and store a few file names...Ch. 4 - Create an ArrayList<String> in the Code Pad by...Ch. 4 - If you wish, you could use the debugger to help...Ch. 4 - Challenge exercise The for-each loop does not use...Ch. 4 - Prob. 25ECh. 4 - Prob. 26ECh. 4 - Prob. 27ECh. 4 - Write out the header of a for-each loop to process...Ch. 4 - Suppose we express the first version of the key...Ch. 4 - Write a while loop (for example, in a method...Ch. 4 - Write a while loop to add up the values 1 to 10...Ch. 4 - Write a method called sum with a while loop that...Ch. 4 - Challenge exercise Write a method isPrime (int n)...Ch. 4 - In the findFirst method, the loop's condition...Ch. 4 - Prob. 35ECh. 4 - Have the MusicOrganizer increment the play count...Ch. 4 - Prob. 37ECh. 4 - Prob. 38ECh. 4 - Prob. 39ECh. 4 - Prob. 40ECh. 4 - Complete the numberOfMembers method to return the...Ch. 4 - Prob. 42ECh. 4 - Prob. 43ECh. 4 - Prob. 44ECh. 4 - Challenge exercise Write a method to play every...Ch. 4 - Prob. 46ECh. 4 - Prob. 47ECh. 4 - Add a close method to the Auction class. This...Ch. 4 - Add a getUnsold method to the Auction class with...Ch. 4 - Suppose the Auction class includes a method that...Ch. 4 - Rewrite getLot so that it does not rely on a lot...Ch. 4 - Prob. 52ECh. 4 - Prob. 53ECh. 4 - Prob. 54ECh. 4 - Prob. 55ECh. 4 - Open the products project and complete the...Ch. 4 - Implement the findProduct method. This should look...Ch. 4 - Implement the numberInStock method. This should...Ch. 4 - Prob. 59ECh. 4 - Challenge exercise Implement a method in...Ch. 4 - Java provides another type of loop: the do-while...Ch. 4 - Prob. 85ECh. 4 - Prob. 86ECh. 4 - Find out about Java's switch-case statement. What...
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