Java: Introduction to Problem Solving and Programming
7th Edition
ISBN: 9780133834604
Author: SAVITCH
Publisher: PEARSON
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Chapter 8, Problem 4PP
Program Plan Intro
Displaying right triangle, rectangle, and square along with their areas and perimeters
Program Plan:
Filename: Test.java
- • Define main function.
- ○ Create the objects for “RightTriangle”, “Rectangle”, and “Square” classes and pass the input value to the respective methods.
- ○ Call the “drawHere” method with “RightTriangle” object “rt”.
- ○ Call the “findArea” and “findCircumference” methods with “RightTriangle” object “rt”.
- ○ Call the “drawHere”, and “drawAt” methods with “Rectangle” object “r”.
- ○ Call the “findArea” and “findCircumference” methods with “Rectangle” object “r”.
- ○ Call the “drawHere”, and “drawAt” methods with “Square” object “s”.
- ○ Call the “findArea” and “findCircumference” methods with “Square” object “s”.
- ○ Display the all the outputs.
Filename: RightTriangle.java
- • Define the “RightTriangle.java” class extends from “ShapeBase” class that implements “ShapeInterface”.
- • Declare the required variables.
- • Define the default constructor, and constructor for the class.
- • Define the “set” method.
- ○ Set the value.
- • Define “drawHere” method.
- ○ Call the “drawTop” method.
- • Define the “drawTop” method.
- ○ Declare the variable “startOfLine” and assign the value of offset plus base divided by 2.
- ○ Call the “skipSpaces()” method with “startOfLine” value.
- ○ Display the “*” character.
- ○ Declare the variable “lineCount” and assign the value of base divided by 2 minus 1.
- ○ Declare the “insideWidth” with value 1.
- ○ The “for” condition is used to display the “*” character in triangle shape.
- ■ Decrement the “startOfLine” value.
- ■ Call the “skipSpaces()” method with “startOfLine” value.
- ■ Display the “*” character.
- ■ Call the “skipSpaces()” method with “insideWidth” value.
- ■ Display the “*” character.
- ■ Increment the “insideWidth” value by 1.
- ○ Call the “drawBase” method with an argument.
- • Define “drawBase” method.
- ○ Call the “skipSpaces()” method.
- ○ Display the “*” character in base of the triangle.
- • Define “skipSpaces()” method.
- ○ Display the space.
- • Define the “findArea” method.
- ○ Return the area of right triangle.
- • Define the “findCircumference” method.
- ○ Return perimeter of the right triangle.
Filename: Rectangle.java
- • Define the “Rectangle.java” class extends from “ShapeBase” class that implements “ShapeInterface”.
- • Include all the methods in the Listing 8.13 in chapter 8.
- • Define another constructor with two parameters.
- ○ Set the values.
- • Define the “findArea” method.
- ○ Return the area of rectangle.
- • Define the “findCircumference” method.
- ○ Return perimeter of the rectangle.
Filename: Square.java
- • Define the “Sqaure.java” class which extends from the “Rectangle” class that implements “ShapeInterface”.
- • Declare the required variables.
- • Define the constructor for the class.
- • Define the accessor and mutator methods.
- • Define the “findArea” method.
- ○ Return the area of square.
- • Define the “findCircumference” method.
- ○ Return perimeter of the square.
Filename: ShapeInterface.java
Define the interface “SpaceInterface”.
- • Declare the “setOffset()” method.
- • Declare the “getOffset()” method.
- • Declare the “drawAt()” method.
- • Declare the “drawHere()” method.
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Chapter 8 Solutions
Java: Introduction to Problem Solving and Programming
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