Description
The purpose of this programming project is to demonstrate the functionality of Linked Lists while reviewing such things as Abstract classes, inheritance, compareTo, file I/O, and various uses of the Scanner class.
REQUIREMENTS You will submit a single file “Assignment7.zip” through the Programming Assignment 7 Submission link on Canvas. This zipped file will contain 5 classes (files) that make up your solution to this assignment. Also, you will create your own test input file “In7.txt” to use for your own testing. However, do NOT include in7.txt in the zipped file for submission. I will use my own for testing. Make sure these files are not zipped into a folder.
DETAILS In this assignment, you will create 3 shape classes (Circle, Rectangle, Triangle) that all inherit from a single abstract class called Shape. You are also responsible for creating the driver class “Assignment7.java” (program that tests your classes and described on page 3) which does the following: reads input data from a file instantiates various objects of the three shapes based on the input data stores each in a LinkedList outputs this list to an output file sorts a copy of this LinkedList of objects outputs the sorted version of the list to the output file outputs the original list to the output file This driver program also needs to ignore errors in the input file that breach the specified input format as described in the Assignment7.java details (described on page 3). 1. Shape.java This is an abstract class that has no fields, 1 abstract method, and one complete method: public abstract class Shape implements Comparable 3. Rectangle.java Be sure to use the invariant that throws an IllegalArgumentException when method arguments that are <= 0 are used to set the length and width fields. Supply an appropriate error message in the parameter list. public class Rectangle extends Shape { Fields: myLength and myWidth: both should be double Methods: public Rectangle (final double theLength, final double theWidth ) { } public void setLength(final double theLength) { } public void setWidth(final double theWidth) { } public double calculateArea( ) { } public String toString( ) { } } toString should only return a String that includes the name of the class, length, width, and area, e.g. output.out.println(rect1); might produce: Rectangle [Length: 2.50, Width: 3.00] Area: 7.50 4. Triangle.java Be sure to use the invariant that throws an IllegalArgumentException when a method argument is used to set any of the sides of the triangle to values that are <= 0 AND if the longest side is = to the sum of the remaining sides. Supply an appropriate error message in the parameter list. public class Triangle extends Shape { Fields: mySideA, mySideB, mySideC: all should be double Methods: public Triangle (final double theSideA, final double theSideB, final double theSideC ) { } public void setSideA(final double theSideA) { } public void setSideB(final double theSideB) { } public void setSideC(final double theSideC) { } public double calculateArea( ) { } public String toString( ) { } } toString should only return a String that includes the name of the class, the sides, and the area, e.g. output.out.println(tri1); might produce: Triangle [SideA: 2.50, SideB: 3.00, SideC: 4.00] Area: 3.75
If you feel the need, please implement any other methods you think the above classes may need. 5. Assignment7.java This is the test driver class that will include main. This program MUST read a file named in7.txt and generate an output file named out7.txt. The in7.txt file must be created by you based on formatting described shortly. In7.txt and out7.txt are NOT to be included in the zipped file. The input file “In7.txt” will contain multiple lines of input. The input is mostly valid input but, there may be some invalid lines interspersed throughout the file. Valid input is as follows: Single value: input for the radius of a circle Two values separated by a space: input for the two sides of a rectangle, 1st = length, 2nd = width Three values separated by a space: input for the three sides of a triangle in SideA, SideB, SideC order. Lines containing anything else (could be anything above plus other data) or nothing at all are considered invalid and should simply be ignored by your program. However, a line such as: 3.2 -5.1 should throw an IllegalArgumentException within the Rectangle class due to the negative value. Again, valid lines will only contain 1, 2, or 3 values, for circles, rectangles, or triangles respectively. Lines with anything else are invalid.
Decompose main by calling methods that input data into the List and output the List. Be sure to use a try/catch block inside the input of data method. The try section should call an appropriate class to instantiate an object (Circle, Rectangle, Triangle) passing the appropriate data for the radius, or sides, respectively. If the constructor of the class discovers inappropriate data, it should throw a new IllegalArgumentException (described above in each shape class). The exception, in turn, will be caught in the catch section of the try/catch block and will print to the console an appropriate error message when an exception is thrown. The program should not terminate but instead, continue to the next line of input. Of course, if no exception occurs, execution will simply bypass the catch block and continue as it should for valid input data.
As you input the data, you should create objects of the appropriate type (mentioned in the above paragraph) and then insert them into a List of Shape objects using a LinkedList. The List should be declared as: List Sample I/O, Next Page – – –
Sample I/O may appear as follows:
Suppose In7.txt contains:
2.5 2.5 3 8.1 3.0 5.0 2.5 3 4 4.4 tuesday -7 3 three 3 -9 3 5
During execution the above input file will first produce the following (error) output to the console: —-jGRASP exec: java Assignment7
java.lang.IllegalArgumentException: ERROR! Not a Triangle. Longest side too long. java.lang.IllegalArgumentException: ERROR! Negative or 0 value can’t be applied to a circle radius. java.lang.IllegalArgumentException: ERROR! Negative or 0 value(s) can’t be applied to a rectangle.
—-jGRASP: operation complete.
When the program finishes, an output file (“Out7.txt”) should have been created with the following contents:
Original List[unsorted]: Circle [Radius: 2.50] Area: 19.63 Rectangle [Length: 2.50, Width: 3.00] Area: 7.50 Triangle [SideA: 2.50, SideB: 3.00, SideC: 4.00] Area: 3.75 Circle [Radius: 4.40] Area: 60.82 Rectangle [Length: 3.00, Width: 5.00] Area: 15.00
Copied List[sorted]: Triangle [SideA: 2.50, SideB: 3.00, SideC: 4.00] Area: 3.75 Rectangle [Length: 2.50, Width: 3.00] Area: 7.50 Rectangle [Length: 3.00, Width: 5.00] Area: 15.00 Circle [Radius: 2.50] Area: 19.63 Circle [Radius: 4.40] Area: 60.82
Original List[unsorted]: Circle [Radius: 2.50] Area: 19.63 Rectangle [Length: 2.50, Width: 3.00] Area: 7.50 Triangle [SideA: 2.50, SideB: 3.00, SideC: 4.00] Area: 3.75 Circle [Radius: 4.40] Area: 60.82 Rectangle [Length: 3.00, Width: 5.00] Area: 15.00
Remember, only zip the following files together: Shape.java, Circle.java, Rectangle.java, Triangle.java, and Assignment7.java into a zip file named Assignment7.zip and submit it to Canvas through the submission link.
