Question

I Need UML Design for the following Java code:

Colorable interface:

public interface Colorable {

//a void method named howToColor().
void howToColor();
}

GeometricObject class:

public class GeometricObject {

}

Sqaure class:

public class Square extends GeometricObject implements Colorable{

//side variable of Square
double side;
  
//Implementing howToColor()
@Override
public void howToColor() {
System.out.println("Color all four sides.");
}
  
//setter and getter methods for Square
public void setSide(double side) {
this.side = side;
}
  
public double getSide() {
return this.side;
}
  
//calculating area of the Square
public void area() {
System.out.println("Square area: "+getSide() * getSide());
}
}

Rectangle class:

public class Rectangle extends GeometricObject implements Colorable{

//variables of Rectangle
double height;
double width;
  
  
@Override
public void howToColor() {
System.out.println("Color all four sides.");
}

//getter and setter methods for height and width
public double getHeight() {
return height;
}

public void setHeight(double height) {
this.height = height;
}

public double getWidth() {
return width;
}

public void setWidth(double width) {
this.width = width;
}

//calculating area of the Rectangle
public void area() {
System.out.println("Rectangle area: "+this.getHeight()* this.getWidth());
}
}

Circle class:

public class Circle extends GeometricObject implements Colorable {

//PIE value as constant
public static final double PIE = 3.14;
  
//radius variable of Circle
double radius;
  
@Override
public void howToColor() {
System.out.println("Color all around the circle.");
}

//setter and getter methods for Circle
public double getRadius() {
return radius;
}

public void setRadius(double radius) {
this.radius = radius;
}
  
//calculating area of the Circle
public void area() {
System.out.println("Circle area: "+PIE * this.getRadius() * this.getRadius());
}
}

Test class:

public class Test {

public static void main(String[] args) {
//creating an array of five GeometricObjects
GeometricObject[] geometricObjects = new GeometricObject[5];
  
//instance of Square class
Square square = new Square();
square.setSide(12.5);
  
Square square1 = new Square();
square1.setSide(8);
  
//instance of Circle class
Circle circle = new Circle();
circle.setRadius(9.6);
  
//instance of Rectangle class
Rectangle rectangle = new Rectangle();
rectangle.setHeight(10);
rectangle.setWidth(12);
  
Rectangle rectangle1 = new Rectangle();
rectangle1.setHeight(5.8);
rectangle1.setWidth(3.6);
  
//storing all the objects into array of GeometricObject
geometricObjects[0] = square;
geometricObjects[1] = square1;
geometricObjects[2] = circle;
geometricObjects[3] = rectangle;
geometricObjects[4] = rectangle1;
  
  
for(GeometricObject geometricObject: geometricObjects) {
//condition to check instance of each type in the geometricObjects array
if(geometricObject instanceof Circle) {
((Circle) geometricObject).area();
((Circle) geometricObject).howToColor();
System.out.print("\n");
}
else if(geometricObject instanceof Rectangle) {
((Rectangle) geometricObject).area();
((Rectangle) geometricObject).howToColor();
System.out.print("\n");
}
else if(geometricObject instanceof Square) {
((Square) geometricObject).area();
((Square) geometricObject).howToColor();
System.out.print("\n");
}
}
}

}

Answer 1

Please find the UML below

<<Abstract Class >> GeometricObject <<Class >> Circle <<extend>> GeometricObject() + area(): void -radius: double + Circle(radius: double) + getRadius(): double + setRadius( radius: double): void + area(): void <<Class>> Test + main( args): void <<extend >> <<extend >> <<Class >> Rectangle <<implement>> - length: double - width : double + Rectangle(length:double,width:double) + getLength(): double + setLength(length : double): void + getWidth(): double + setWidth(width: double): void + howToColor(): void + areal): void <<Interface>> Colorable <<Class >> Square - <<implement>> -- + howToColor() : void - side: double + Square(side: double) + getSide(): double + setSide(side: double):void + areal): void ---- <<implement>>"

Please let me know if you have any doubt or modify the answer, Thanks :)