Programming Fundamentals II - JAVA Lab #8-Polymorphism NAME Problem: Develop the 'Shape' application such that: Implement an array of objects of various types (all SIX classes), in any order. In some type of a looping structure, demonstrate polymorphism by calling all three of the methods, draw, move, and erase. That is, within the curly braces, there will Verify that the output messages come from all three methods, from all seven classes The only class that you should have to develop for this class will be the test application. The six shape classes from Lab-7 should remain unchanged. Due Date: TBD Note: There will be no late labs!!
Develop the ‘Shape’ application such that:
Implement an array of objects of various types (all SIX classes), in any order.
In some type of a looping structure, demonstrate polymorphism by calling all three
of the methods, draw, move, and erase. That is, within the curly braces, there will
be only three method calls.
Verify that the output messages come from all three methods, from all seven
classes.
The only class that you should have to develop for this class will be the test
application. The six shape classes from Lab-7 should remain unchanged.
----------------------------------------------------------------------------------------------------------------------------------------------------------------------classes used in lab 7:
//----------------------------------------------------------------------
// SHAPE
//----------------------------------------------------------------------
class Shape
{
public Shape()
{
System.out.println("Shape class - contructor");
}
public void draw()
{
System.out.println("Shape - draw method");
}
public void move()
{
System.out.println("Shape - move method");
}
public void erase()
{
System.out.println("Shape - erase method");
}
}
//----------------------------------------------------------------------
// RECTANGLE
//----------------------------------------------------------------------
class Rectangle extends Shape{
public Rectangle()
{
System.out.println("Rectangle class - constructor");
}
@Override
public void draw()
{
System.out.println("Rectangle - draw method");
}
@Override
public void move()
{
System.out.println("Rectangle - move method");
}
@Override
public void erase()
{
System.out.println("Rectangle - erase method");
}
}
//----------------------------------------------------------------------
// SQUARE
//----------------------------------------------------------------------
class Square extends Rectangle{
public Square()
{
System.out.println("Square class - constructor");
}
@Override
public void draw()
{
System.out.println("Square - draw method");
}
@Override
public void move()
{
System.out.println("Square - move method");
}
@Override
public void erase()
{
System.out.println("Square - erase method");
}
}
//----------------------------------------------------------------------
// ELLIPSE
//----------------------------------------------------------------------
class Ellipse extends Shape {
public Ellipse()
{
System.out.println("Ellipse class - constructor");
}
@Override
public void draw()
{
System.out.println("Ellipse - draw method");
}
@Override
public void move()
{
System.out.println("Ellipse - move method");
}
@Override
public void erase()
{
System.out.println("Ellipse - erase method");
}
}
//----------------------------------------------------------------------
// CIRCLE
//----------------------------------------------------------------------
class Circle extends Ellipse{
public Circle()
{
System.out.println("Circle class - constructor");
}
@Override
public void draw()
{
System.out.println("Circle - draw method");
}
@Override
public void move()
{
System.out.println("Circle - move method");
}
@Override
public void erase()
{
System.out.println("Circle - erase method");
}
}
//----------------------------------------------------------------------
// TRIANGLE
//----------------------------------------------------------------------
class Triangle extends Shape{
public Triangle()
{
System.out.println("Triangle class - contructor");
}
@Override
public void draw()
{
System.out.println("Triangle - draw method");
}
@Override
public void move()
{
System.out.println("Triangle - move method");
}
@Override
public void erase()
{
System.out.println("Triangle - erase method");
}
}
//----------------------------------------------------------------------
// SHAPETEST
//----------------------------------------------------------------------
public class ShapeTest {
public static void main(String args[]) {
Shape s = new Shape();
Rectangle r = new Rectangle();
Square sq = new Square();
Ellipse e = new Ellipse();
Circle c = new Circle();
Triangle t = new Triangle();
Shape[] shapes = {s,r,sq,e,c,t};
for(Shape shape:shapes)
{
shape.draw();
shape.move();
shape.erase();
}
}
}
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