Concept explainers
Videos
Program Plan:
- Include the required import statement.
- Define the main class.
- Define the main method using public static main.
- Declare the input scanner.
- Get the three sides of the triangle from the user.
- Create an object for the “Triangle” class.
- Get the color from the user and call the “setColor” method with the parameter “color”.
- Get the Boolean value for filled the triangle and call the “setFilled” method with the parameter “filled”.
- Display the output.
- Define the main method using public static main.
- Define the “GeometricObject” class.
- Declare the required variables.
- Define the default constructor and constructor for the class.
- Define the accessor and matator.
- The “isFilled” and “setColor” method will return the value to the main class.
- Define the derived class “Triangle” from the “GeometricObject” class.
- Declare the required variables.
- Define the default constructor and constructor for the class.
- Define the accessor.
- The “getArea()” method will calculate the area of triangle and then return the result.
- The “getPerimeter()” method will return the perimeter of the triangle.
- The “toString()” method will return the three sides of the triangle.
The below program is used to display the area, perimeter and sides of the triangle as follows:
Explanation of Solution
Program:
//import statement
import java.util.Scanner;
//class Excersise11_01
public class Exercise11_01
{
// main method
public static void main(String[] args)
{
// declare the scanner variable
Scanner input = new Scanner(System.in);
//get the input from the user
System.out.print("Enter three sides: ");
//declare the variables
double side1 = input.nextDouble();
double side2 = input.nextDouble();
double side3 = input.nextDouble();
//create an object for the "Triangle" class
Triangle triangle = new Triangle(side1, side2, side3);
//get the input from the user
System.out.print("Enter the color: ");
String color = input.next();
//call the "setColor" function
triangle.setColor(color);
//get the input from the user
System.out.print("Enter a boolean value for filled: ");
boolean filled = input.nextBoolean();
//call the "setFilled" function
triangle.setFilled(filled);
//print the output
System.out.println("The area is " + triangle.getArea());
System.out.println("The perimeter is "
+ triangle.getPerimeter());
System.out.println(triangle);
}
}
//definition of class "GeometricObject"
class GeometricObject
{
/* declare the required variables and initialize it */
private String color = "white";
private boolean filled;
private java.util.Date dateCreated;
//definition of default constructor
public GeometricObject()
{
//create an object
dateCreated = new java.util.Date();
}
//definition of constructor
public GeometricObject(String color, boolean filled)
{
//create an object
dateCreated = new java.util.Date();
//set the value
this.color = color;
this.filled = filled;
}
//definition of accessor
public String getColor()
{
//return the color
return color;
}
//definition of mutator
public void setColor (String color)
{
//set the color
this.color = color;
}
//definition of the "isFilled" method
public boolean isFilled()
{
//return the value
return filled;
}
//definition of the "setFilled" method
public void setFilled(boolean filled)
{
//set the value
this.filled = filled;
}
//definition of the "getDateCreated" method
public java.util.Date getDateCreated()
{
//return the value
return dateCreated;
}
//definition of the "toString" method
public String toString()
{
//return the value
return "created on " + dateCreated + "\ncolor: " + color + " and filled: " + filled;
}
}
//definition of derived class "Triangle"
class Triangle extends GeometricObject
{
/* declare the required variables and initialize it */
private double side1 = 1.0, side2 = 1.0, side3 = 1.0;
/*definition of Constructor */
public Triangle()
{
}
/* definition of Constructor */
public Triangle(double side1, double side2, double side3)
{
this.side1 = side1;
this.side2 = side2;
this.side3 = side3;
}
//definition of accessor
public double getSide1()
{
//return the value
return side1;
}
//definition of accessor
public double getSide2()
{
//return the value
return side2;
}
//definition of accessor
public double getSide3()
{
//return the value
return side3;
}
/*override method of "getArea" in GeometricObject */
public double getArea()
{
//declare and calculate the value
double s = (side1 + side2 + side3) / 2;
//return the value
return Math.sqrt(s * (s - side1) * (s - side2) * (s - side3));
}
/*override method of "getPerimeter" in GeometricObject */
public double getPerimeter()
{
//return the value
return side1 + side2 + side3;
}
//definition of "toString" method
public String toString()
{
// return the three sides
return "Triangle: side1 = " + side1 + " side2 = " + side2 +" side3 = " + side3;
}
}
UML diagram:
Explanation:
The above UML diagram the “GeometricObject” is a parent class which contains “color”, “filled”, “dateCreated” variables and “GeometricObject()”, “GeometricObject(String color, boolean filled)”, “getColor()”, “getColor(String color)”, “isFilled()”, “setFilled(boolean filled)”, “getDateCreated()” and “toString()” methods.
The “Triangle” is the child class extended from “GeometricObject” class it contains “side1”, “side2” and “side3” variables and “Triangle()”, “Triangle(double side1, double side2, double side3)”, “getSide1()”, “getSide2()”, “getSide3()”, “getArea()”, “getPerimeter()” and “toString()” methods.
Enter three sides: 2
3
4
Enter the color: black
Enter a boolean value for filled: true
The area is 2.9047375096555625
The perimeter is 9.0
Triangle: side1 = 2.0 side2 = 3.0 side3 = 4.0
Want to see more full solutions like this?
Chapter 11 Solutions
Introduction to Java Programming and Data Structures, Comprehensive Version (11th Edition)
Additional Engineering Textbook Solutions
Database Concepts (8th Edition)
Computer Science: An Overview (13th Edition) (What's New in Computer Science)
Starting Out with C++ from Control Structures to Objects (9th Edition)
Elementary Surveying: An Introduction To Geomatics (15th Edition)
Starting Out with Python (4th Edition)
Introduction To Programming Using Visual Basic (11th Edition)
- Don't use chatgpt or any other AIarrow_forwardGiven a relation schema R = (A, B, C, D, E,G) with a set of functional dependencies F {ABCD BC → DE B→ D D→ A}. (a) Show that R is not in BCNF using the functional dependency A → BCD. (b) Show that AG is a superkey for R (c) Compute a canonical cover Fc for the set of functional dependencies F. Show your work. (d) Give a 3NF decomposition of R based on the canonical cover found in (c). Show your work. (e) Give a BCNF decomposition of R using F. Show your work.arrow_forwardThe following entity-relationship (ER) diagram models a database that helps car deal- ers maintain records of customers and cars in their inventory. Construct a relational database schema from the ER diagram. Your set of schemas should include primary-key and foreign-key constraints and you should ensure there are no redundant schemas. has_model model modelID name vehicle has_vehicle VIN dealer_ID brand name has_available_option has_option has_dealer options options_ID specification dealer dealer ID name customer_ID owned_by customer customer ID namearrow_forward
- A relation schema R = (A, B, C, D, E) with a set of functional dependencies F= {D A CAB} is decomposed into R₁ = (A, B, C) and R2 = (C, D, E). (a) Is this a lossless-join decomposition? Why or why not? (b) Is the decomposition dependency preserving? Why or why not?arrow_forwardNo chatgpt pleasearrow_forwardPlease help draw alu diagraarrow_forward
- 1. Level the resources (R) for the following network. Show exactly which activity is being moved at each cycle and how many days it is being moved. Show all cycles required to utilize the free float and the back float. B H 3 3 L 2 0-0-0 A C F G K N P Q T 0 3 2 2 1 2-2-2 7R 8R 4R 6R 4R 2R 5R 4R D 1 2R 2 M 000 4R 2 4R 1 2 3 4 B5 B BE B 5 5 7 D 2003 C NO C MBSCM В H 5 2 F 7 7 8 SH2F80 5 Н Н 6 7 7L3G4+ 6H2G4 J 4 4 14 8 L K 00 36 9 10 11 12 13 14 15 P 2 Z+ N N 4 4 Z t 2334 4 Σ + M M 4 +arrow_forward2. Perform resource allocation for the following project. Resource limits are 6 labors and 2 helpers. Legend: Activity Dur Resources G H 2 3 2L 1H 2L OH A 1 3L 1H + B D F J K 3 4 6 2 4 4L 2H 3L OH 4L 1H 2L 2H 4L 2H C E 2 2 I 1 2L 1H 3L 1H 5L 1Harrow_forwardNeed Java method please. Thank you.arrow_forward
- Need Java method please. Thank you.arrow_forward3. Write two nested loops to generate the following output. (Note: There is one space between each number, and any extra line shown is intentional.) 12 10 8 6 18 15 12 24 20 30 2 3 3 6 48 12 5 10 15 20 6 12 18 24 30arrow_forwardWrite in verilog coding languagearrow_forward
EBK JAVA PROGRAMMINGComputer ScienceISBN:9781337671385Author:FARRELLPublisher:CENGAGE LEARNING - CONSIGNMENT
Microsoft Visual C#Computer ScienceISBN:9781337102100Author:Joyce, Farrell.Publisher:Cengage Learning,
Programming Logic & Design ComprehensiveComputer ScienceISBN:9781337669405Author:FARRELLPublisher:Cengage
C++ Programming: From Problem Analysis to Program...Computer ScienceISBN:9781337102087Author:D. S. MalikPublisher:Cengage Learning
C++ for Engineers and ScientistsComputer ScienceISBN:9781133187844Author:Bronson, Gary J.Publisher:Course Technology Ptr