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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Textbook Question
Chapter 3, Problem 9E
What error message do you see in the Code Pad if you type the following?
The error message is not actually very helpful at all. Can you work out what is incorrect about this call to setValue, and correct it? It would also be worth remembering this error message because it results from an easy error to make in the early stages of learning.
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The Challenge: You are dealing with a lot of unfamiliar code and want to walk through it step by step. You've reached a call to the method do_the_funny_bird and want to know what it does, but you're not sure where it's defined. How to efficiently explore the code in such circumstances.
Use this exercise to test your code that you wrote in the previous exercise.
Problem Class
In this exercise, you are going to create the Problem class. The Problem class is used to help simulate a math fact, for example:
2 + 5 =
Your class needs to contain two constructors, one that takes String, int, int that represents the operator sign(+, -, *, or /), the minimum, and maximum values for the number range, and a second constructor that takes only a String that represents the operator sign. For the second constructor, the minimum should default to zero and the maximum to ten.
Your Problem object should generate 2 random integers between the minimum and maximum values (inclusively). Each Problem object should only have one set of numbers that do not change.
While you may include additional helper methods, two methods need to be available to the user. The first is the answer method that should return a double that represents the answer to the problem.
The second is the toString that…
In this second exercise, we are going to look at the iIn this exercise, you are going to complete the Rectangle class. You need to complete the class so that you can print and compare two rectangles. Once complete, use the RectangleTester to test the results. In the tester class, you are given 3 rectangles that you should print and compare.
Sample results are provided below.
Sample output
A rectangle with a width of 5 and a height of 4
A rectangle with a width of 5 and a height of 4
A rectangle with a width of 10 and a height of 4
true
false
public class RectangleTester{public static void main(String[] args){Rectangle rect1 = new Rectangle(5, 4);Rectangle rect2 = new Rectangle(5, 4);Rectangle rect3 = new Rectangle(10, 4);// Print all three rectangles// Print one true statement comparing rectangles// Print one false statment comparing rectangles}}
public class Rectangle{
private int width;private int height;public Rectangle(int width, int height) {}}
Chapter 3 Solutions
Objects First with Java: A Practical Introduction Using BlueJ (6th Edition)
Ch. 3 - Prob. 1ECh. 3 - At what time (s) can a class diagram change? How...Ch. 3 - At what time(s) can an object diagram change? How...Ch. 3 - Write a definition of a field named tutor that can...Ch. 3 - Prob. 5ECh. 3 - Create a second NumberDisplay object with a limit...Ch. 3 - Select Show Code Pad from the View menu. Create a...Ch. 3 - What error message do you see in the Code Pad if...Ch. 3 - What error message do you see in the Code Pad if...Ch. 3 - What happens when the setValue method is called...
Ch. 3 - Prob. 11ECh. 3 - Prob. 12ECh. 3 - Which of the following expressions return...Ch. 3 - Write an expression using boolean variables a and...Ch. 3 - Write an expression using boolean variables a and...Ch. 3 - Consider the expression (a && b). Write an...Ch. 3 - Does the getDisplayValue method work correctly in...Ch. 3 - Prob. 18ECh. 3 - In Exercise 2.79 you were asked to investigate...Ch. 3 - Explain the modulo operator. You may need to...Ch. 3 - What is the result of the expression 83?Ch. 3 - Try out the expression in the Code Pad. Try other...Ch. 3 - Prob. 23ECh. 3 - Prob. 24ECh. 3 - Explain in detail how the increment method works.
Ch. 3 - Rewrite the increment method without the modulo...Ch. 3 - Open the clock-display project and create a...Ch. 3 - Prob. 28ECh. 3 - Prob. 29ECh. 3 - Prob. 30ECh. 3 - Look at the second constructor in C1ockDisplay's...Ch. 3 - Prob. 32ECh. 3 - Given a variable Printer p1; which currently holds...Ch. 3 - Open the house project from Chapter 1 and review...Ch. 3 - Prob. 35ECh. 3 - Does the Picture class contain any internal method...Ch. 3 - Remove the following two statements from the draw...Ch. 3 - Prob. 38ECh. 3 - Prob. 39ECh. 3 - Assume a class Tree has a field of type Triangle...Ch. 3 - Prob. 41ECh. 3 - Open the mail-system project, which you can find...Ch. 3 - Prob. 43ECh. 3 - Prob. 44ECh. 3 - Open the editor for the MailClient class and set a...Ch. 3 - Step one line forward in the execution of the...Ch. 3 - Prob. 47ECh. 3 - Prob. 48ECh. 3 - Prob. 49ECh. 3 - Set a breakpoint in the first line of the sendMai1...Ch. 3 - Use a combination of code reading, execution of...Ch. 3 - Use the debugger to investigate the clock-display...Ch. 3 - Prob. 53ECh. 3 - Prob. 54ECh. 3 - Prob. 55ECh. 3 - Describe the changes that would be required to the...Ch. 3 - Write the code for the timeTick method in...Ch. 3 - Discuss whether the current design of the...Ch. 3 - Challenge exercise In the current design of...
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