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First are the instructions and then will be the Lab Shell.
First are the instructions and then will be the Lab Shell. Thanks
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Add three instance variables to your class RightTriangle from lab 5. The first two are of type int and are called xLoc and yLoc and the third is of type int called ID. Also add a static variable of type double called scaleFactor. This should be initialized to a default value of 1. Update the constructor to set the three new instance variables and add appropriate get and set methods for the four new variables. All set methods including those from lab 5 should verify that no invalid data is set. Also define a new method ScaleShape() which multiplies the base and height instance variables by the scaleFactor and then updates the hypotenuse.
An application needs written which shows the user the following menu and implement all options. The program should continue to run and process requests until the user selects 9. The program should double-check that the user really wants to exit. You may use a limit of 10 possible triangles to simplify implementation. The program should assign new ids to assure their uniqueness, the user should not enter an id for a new object in option 1. All input must be validated and appropriate feedback given for invalid input. Option 4 should display all info about the object. This is 8 method calls.
1 - Enter a new right triangle
2 - Delete a right triangle
3 - Delete all right triangles
4 - Display all right triangles
5 - Move a triangle
6 - Resize a triangle
7 - Enter a scale factor
8 - Scale all triangles
9 - Exit program
import java.util.Scanner;
public class Lab7Shell
{
public static void main(String[] args)
{
// DATA
RightTriangle [] triangles = new RightTriangle[10];
int nextIDNumber = 1;
boolean exit = false;
int selection=0;
Scanner input = new Scanner(System.in);
int id=0;
int x=0, y=0;
double base=0, height=0;
boolean found = false;
// ALGORITHM
// loop until user exits
do
{
// display options
// get selection (validate)
// switch on selection
switch(selection)
{
case 1:
// get size from user (two variables only,
calculate the hypotenuse)
// get location from user (two variables, X,Y
location)
// set found to false
// loop through array
for (int i = 0; i < triangles.length; i++)
{
// if this is an empty spot
if (triangles[i] == null)
{
// create new RightTriangle
object and assign to current array element
triangles[i] = new
RightTriangle(nextIDNumber++, base, height, x, y);
// set found to true
found = true;
// break out of loop
break;
}
}
// if not found, give error message
// break out of switch statement
break;
case 2:
// get id number to delete
// set found to false
// loop through array
for (int i = 0; i < triangles.length; i++)
{
// if this is a valid object and the
correct object
if (triangles[i] != null &&
triangles[i].GetID() == id)
{
// delete object
triangles[i] = null;
// set found to true
// break out of loop
}
}
// if not found, give error message
// break out of switch statement
case 3:
// loop through array
// if this is a valid object
// delete object
// break out of switch statement
break;
case 4:
// display header
// loop through array
// if this is a valid object
// display all info about
object. This should call and display all 8 get methods that return
information.
// break out of switch statement
break;
case 5:
// get id number to move
// get location from user (two variables new
X,Y location)
// set found to false
// loop through array
// if this is a valid object and the
correct object
// call two set methods
// set found to true
// break out of loop
// if not found, give error message
// break out of switch statement
break;
case 6:
// get id number to resize
// get size from user (two variables)
// set found to false
// loop through array
// if this is a valid object and the
correct object
// call SetBaseAndHeight
// set found to true
// break out of loop
// if not found, give error message
// break out of switch statement
case 7:
// get new scale factor (validate)
// call SetScaleFactor to set the new scale
factor
// break out of switch statement
break;
case 8:
// loop through array
// if this is a valid object
// call ScaleShape method on
object
// break out of switch statement
break;
case 9:
// confirm user wants to exit
// set variable to break out of loop
// break out of switch statement
break;
}
// End loop
} while (!exit);
}
}
class RightTriangle
{
// with three instance variables of type double called base, height,
and hypotenuse.
private double base;
private double height;
private double hypotenuse;
// add three new instance variables
// add static scaleShape
// update constructor to take the new instance variables
public RightTriangle(int i, double b, double h, int x, int y)
{
SetBaseAndHeight(b, h);
// set the other instance variables
}
// a single set method which takes new values for base and height
and calculates the hypotenuse,
public void SetBaseAndHeight(double b , double h)
{
if (b > 0.0 && h > 0.0)
{
base = b;
height = h;
hypotenuse = Math.sqrt(base * base + height *
height);
}
}
// add set methods for the three new instance variables
// get methods for all three instance variables
public double GetBase()
{
return base;
}
public double GetHeight()
{
return height;
}
public double GetHypotenuse()
{
return hypotenuse;
}
// add get methods for the three new instance variables
// and methods getArea and getPerimeter.
public double GetArea()
{
return 0.5 * base * height;
}
public double GetPerimeter()
{
return base + height + hypotenuse;
}
// add ScaleShape method
}
