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 1, Problem 7E
Program Plan Intro
Question reference:Â Refer to Chapter 1, Exercise 1.7 to create multiple objects on the object bench. Create one big-yellow circular object, another small-green circular object, and then several other objects of other shapes such as triangle, square, and person. Change their position, size, and color as well.
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What would you have to do to add a new field, for example one called name, to a circle object?
Add two new buttons that will be used to enlarge or shrink the circle, placing these buttons below the others. The text on these buttons can be simply “Enlarge” and “Shrink”. The size of a circle object is determined by the radius property, and the Circle class provides two methods to access and change its radius. Assuming c refers to a circle object, c.getRadius() returns the current radius of the circle; c.setRadius(r) changes the radius of the circle to the value r. You will need to add event handlers for the Enlarge and Shrink buttons, which should increase or decrease the radius of the circle by 10 pixels each time that the button is clicked. Remember that the handler for each button must be activated by invoking the setOnAction method, as we did for the other buttons. The code to handle these events will need to be added by creating two new branches inside the handle method of your program. • For the Shrink button, add a condition to the handler, to prevent the circle from…
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Chapter 1 Solutions
Objects First with Java: A Practical Introduction Using BlueJ (6th Edition)
Ch. 1 - Prob. 1ECh. 1 - Prob. 2ECh. 1 - Prob. 3ECh. 1 - Prob. 4ECh. 1 - This is a very simple example, and not many colors...Ch. 1 - Prob. 6ECh. 1 - Prob. 7ECh. 1 - Prob. 8ECh. 1 - Prob. 9ECh. 1 - Select Show Terminal from the View menu. This...
Ch. 1 - Select Show Code Pad from the View menu. This...Ch. 1 - Prob. 12ECh. 1 - Prob. 13ECh. 1 - Prob. 14ECh. 1 - Look at the pop-up menu of class Picture again....Ch. 1 - In the source code of class Picture, find the part...Ch. 1 - Add a second sun to the picture. To do this, pay...Ch. 1 - Prob. 18ECh. 1 - Prob. 19ECh. 1 - Prob. 20ECh. 1 - Create an object of class Student. You will notice...Ch. 1 - Prob. 22ECh. 1 - Prob. 23ECh. 1 - Call the numberOfStudents method of that class....Ch. 1 - Look at the signature of the enrollStudent method....Ch. 1 - Prob. 26ECh. 1 - Prob. 27ECh. 1 - Prob. 28ECh. 1 - Prob. 29ECh. 1 - In this chapter we have mentioned the data types...Ch. 1 - What are the types of the following values?...Ch. 1 - Prob. 32ECh. 1 - Write the header for a method named send that has...Ch. 1 - Prob. 34ECh. 1 - Prob. 35ECh. 1 - Prob. 36E
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