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 16E
Rewrite both the 1istFi1e and removeFi1e methods in MusicOrganizer so that they use your validIndex method to check their parameter, instead of the current boolean expression. They should only call get or remove on the ArrayList if validlndex returns true.
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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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- For the first part of this lab, copy your working ArrayStringList code into the GenericArrayList class.(already in the code) Then, modify the class so that it can store any type someone asks for, instead of only Strings. You shouldn't have to change any of the actual logic in your class to accomplish this, only type declarations (i.e. the types of parameters, return types, etc.) Note: In doing so, you may end up needing to write something like this (where T is a generic type): T[] newData = new T[capacity]; ...and you will find this causes a compiler error. This is because Java dislikes creating new objects of a generic type. In order to get around this error, you can write the line like this instead: T[] new Data = (T[]) new Object[capacity] This creates an array of regular Objects which are then cast to the generic type. It works and it doesn't anger the Java compiler. How amazing! Once you're done, screenshot or save your code for checkin later. For the second part of the lab,…arrow_forwardhow would you do this in a simple way? this is a non graded practice labarrow_forwardimplemente The Peek method by calling the Item method with the index variable as the argument. The Clear method simply calls an identical method in the ArrayList class. The Count property is written as a read-only property since we don’t want to accidentally change the number of items on the stackarrow_forward
- I need help creating the printAnimal() method that prints from the menu, I keep getting somethings to print but not the full list and I cannot figure out what I am doing wrong. I have included pictures of the first part of the menu loop and the print menu implement a printAnimals() method that provides easy-to-read output displaying the details of objects in an ArrayList. To demonstrate this criterion in a “proficient” way, your implemented method must successfully print the ArrayList of dogs or the ArrayList of monkeys. To demonstrate this criterion in an “exemplary” way, your implemented method must successfully print a list of all animals that are “in service” and “available”. This is what I have so far for the method: // Complete printAnimals // Include the animal name, status, acquisition country and if the animal is reserved. // Remember that this method connects to three different menu items. // The printAnimals() method has three different outputs…arrow_forwardChallenge exercise Read the footnote about the Arrays. asList method. Find and read the sections later in this chapter about class -variables and class methods. Explain in your own words how this works.arrow_forwardPlease use java only and public int method. Show the steps with the pictures also. In this assignment, you will implement a class calledArrayAndArrayList. This class includes some interesting methods for working with Arrays and ArrayLists. For example, the ArrayAndArrayList class has a “findMax” method which finds and returns the max number in a given array. For a defined array: int[] array = {1, 3, 5, 7, 9}, calling findMax(array) will return 9. There are 4 methods that need to be implemented in the A rrayAndArrayList class: ● howMany(int[] array, int element) - Counts the number of occurrences of the given element in the given array. ● findMax(int[] array) - Finds the max number in the given array. ● maxArray(int[] array) - Keeps track of every occurrence of the max number in the given array. ● swapZero(int[] array) - Puts all of the zeros in the given array, at the end of the given array. Each method has been defined for you, but without the code. See the javadoc for each…arrow_forward
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