Lab Objectives This lab was designed to reinforce programming concepts from Chapter 6 of Java How to Program: 11/e. In this lab you will practice: Declaring and using class & methods Using class objects Problem Description Build a class called buildCircle_Yourlinitial using the following class table buildCircle_YourInitial -radius: double -requestRadius(): duble + calculator ():void +printPerimeter(): void +printArea():void Programming Steps Step 1: Create a Java program to define this dass buildCircle_YourInitial, including your initial in the file name and class name. All members of the class must be declared within the class declaration. 1. One instance variable radius 2. No declaration for any constructor The compiler will create the following default constructor public buildCircle_Your Initial() b. The default constructor will be used to create an object of the classif needed 3. Four methods of the class (no set method noget method) a. calculator The declaration is given It is a trigger to call all other three methods public void calculator() { do ( //Request a raduis radius requestRadius(); //Calculate the perimeter & area of the circle if (radius 0) ( printPerimeter(); printArea(): System.out.println(); 1 while (radius 1-01 //and method calculator b. requestRadius L. You should provide the definition for this method It should ask a value from user for the instance variable radius It is private so it can only be called through the method calculator in another class, for protection purpose iv. You must add an import declaration before the dass declaration since you will use Scanner class in this method v. The entered value will be returned so in the caller method (calculator) it could be set to the instance variable radius 1) Since the entered value is for radius, it must be positive 2) It can also be 0 since O will be taken as a flag to stop the loop in the method calculator 3) Aloop is needed to keep requesting till a non-negative value is entered c print Printer & printre i. You should provide the definition for these two methods, which simply print out the calculation result
Lab Objectives This lab was designed to reinforce programming concepts from Chapter 6 of Java How to Program: 11/e. In this lab you will practice: Declaring and using class & methods Using class objects Problem Description Build a class called buildCircle_Yourlinitial using the following class table buildCircle_YourInitial -radius: double -requestRadius(): duble + calculator ():void +printPerimeter(): void +printArea():void Programming Steps Step 1: Create a Java program to define this dass buildCircle_YourInitial, including your initial in the file name and class name. All members of the class must be declared within the class declaration. 1. One instance variable radius 2. No declaration for any constructor The compiler will create the following default constructor public buildCircle_Your Initial() b. The default constructor will be used to create an object of the classif needed 3. Four methods of the class (no set method noget method) a. calculator The declaration is given It is a trigger to call all other three methods public void calculator() { do ( //Request a raduis radius requestRadius(); //Calculate the perimeter & area of the circle if (radius 0) ( printPerimeter(); printArea(): System.out.println(); 1 while (radius 1-01 //and method calculator b. requestRadius L. You should provide the definition for this method It should ask a value from user for the instance variable radius It is private so it can only be called through the method calculator in another class, for protection purpose iv. You must add an import declaration before the dass declaration since you will use Scanner class in this method v. The entered value will be returned so in the caller method (calculator) it could be set to the instance variable radius 1) Since the entered value is for radius, it must be positive 2) It can also be 0 since O will be taken as a flag to stop the loop in the method calculator 3) Aloop is needed to keep requesting till a non-negative value is entered c print Printer & printre i. You should provide the definition for these two methods, which simply print out the calculation result
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
Related questions
Question
Hello can you help me do this Java
Transcribed Image Text:Lab Objectives
This lab was designed to reinforce programming concepts from Chapter 6 of Java How to
Program: 11/e. In this lab you will practice:
Declaring and using class & methods
Using class objects
Problem Description
Build a class called buildCircle_Yourinitial using the following class table
buildCircle_YourInitial
-radius: double
-requestRadius(): double
+ calculator ():void
+ printPerimeter (): void
+printArea():void
Programming Steps
Step 1:
Create a Java program to define this class buildCircle_YourInitial, including your initial
in the file name and class name.
All members of the class must be declared within the class declaration.
1. One instance variable radius
2. No declaration for any constructor
a. The compiler will create the following default constructor
public buildCircle_Your Initial()
b. The default constructor will be used to create an object of the classif needed
3. Four methods of the class (no set method norget method)
a. calculator
i. The declaration is given
. It is a trigger to call all other three methods
public void calculator() {
do [
//Request a raduis
radius requestRadius();
//Calculate the perimeter & area of the circle
if (radius 0) (
printPerimeter();
printArea();
b. requestRadius
System.out.println();
}
1 while (radius - 0);
//end method calculator
i. You should provide the definition for this method
. It should ask a value from user for the instance variable radius
i. It is private so it can only be called through the method calculator in
another class, for protection purpose
iv. You must add an import declaration before the class declaration since
you will use Scanner class in this method
v. The entered value will be returned so in the caller method (calculator)
it could be set to the instance variable radius
1) Since the entered value is for radius, it must be positive
2) It can also be O since 0 will be taken as a flag to stop the loop in
the method calculator
3) A loop is needed to keep requesting till a non-negative value is
entered
c printPerimeter & printArea
i. You should provide the definition for these two methods, which simply
print out the calculation result
Transcribed Image Text:Step 2:
Create a Java application called Projects_buildCircleApp_YourInitial.java to use class
buildCircle_YourInitial (a Java application, also called a demo or a driver).
Your application only needs to call the trigger method of the class calculator.
Step 3:
Debug and run the application Project6_buildCircleApp YourInitial.java. Snapshot your
compiler window to fully show your output pane and name the image as
Project6_YourName.png.
• You must make sure your both program files are in the same folder.
Sample Output
General Output
Please enter a radius (positive or 0 to exit): 5
The perimeter of your circle is 31.4.
The area of your circle is 78.5.
Please enter a radius (positive or 0 to exit): 8
The perimeter of your circle i 10.3.
The area of your circle is 201.1.
Please enter a radius (positive or 0 to exit): 90
The perimeter of your circle in 145.8.
The area of your circle is 25446.9.
Please enter a radius (positive or 0 to exit): 0
Process completed.
Submission
Submit the completed Java programs buildCircle_YourInitial.java (60%) &
Project6_buildCircleApp_YourInitial.java (20%) and the image of the output
Projects YourName.png (20%) to Blackboard via the link Projects in Assignments section on
the course page.
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