The Java program shown in the next pages is implemented with respect to Composite design pattern. You are asked to respond to the following questions:

Identify the composite class,

Identify the Base component class,

Identify the components classes,

Draw the class diagram that fits with the program presented in the next pages.

//Draw a class diagram on paper //

package refactoring_guru.composite.example.shapes;

import java.awt.*;

public interface Shape {

int getX(); int getY();

int getwidth(); int getHeight);

void move(int x, int y);

boolean isInsideBounds(int x, int y);

void select);

void unSelect();

boolean isSelected);

void paint(Graphics graphics);

}

package refactoring_guru.composite.example.shapes;

import java.awt.*;

abstract class BaseShape implements Shape {

public int x;

public int y;

public Color color;

private boolean selected = false;

BaseShape(int x, int y, Color color) {

this.x = x;

this.y = y;

this.color = color;

}

@Override

public int getX() {

return x;

}

@Override

public int getY() {

return y;

@Override

public int getwidth() {

return 0;

}

@Override

public int getHeight() {

return 0;

}

@Override

public void move(int x, int y) {

this.x += x;

this.y += y;

@Override

public boolean isInsideBounds(int x, int y) {

return x > getX() &8 x < (getX() + getwidth()) 88

y > getY() ss y < (getY() + getHeight ( )) ;

}

@Override

public void select() {

selected = true;

override

public void unSelect() {

selected = false;

@Override

public boolean isSelected() {

return selected;

void enableSelectionStyle(Graphics graphics) {

graphics.setColor(Color.LIGHT_GRAY);

Graphics2D g2 = (Graphics2D) graphics;

float [] dash1 = {2.0f};

g2.setStroke(new BasicStroke(1.0f, BasicStroke.CAP_BUTT,

BasicStroke.JOIN_MITER,

2.0f, dash1, 0.0f));

void disableSelectionStyle(Graphics graphics) {

graphics.setColor(color);

Graphics2D g2 = (Graphics2D) graphics;

g2.setStroke(new BasicStroke());

}

@Override

public void paint(Graphics graphics) {

if (isSelected()) 3

enableSelectionStyle (graphics) ;

else

disableSelectionStyle(graphics);

}

package refactoring_guru.composite.example.shapes;

import java.awt.*;

public class Dot extends Baseshape {

private final int DOT_SIZE = 3;

public Dot(int x, int y, Color color) {

super (x, y, color);

}

@Override

public int getwidth) {

return DOT_SIZE;

}

@Override

public int getHeight() {

return DOT_SIZE;

}

@Override

public void paint (Graphics graphics) {

super.paint (graphics);

graphics.fillRect(x - 1, y - 1, getWidth(), getHeight());

Si shapes/Circle.java: A circle

package refactoring_guru. composite.example.shapes;

import java.awt.*;

public class Circle extends BaseShape {

public int radius;

public Circle(int x, int y, int radius, Color color) {

super (x, y, color);

this.radius = radius;

@Override

public int getwidth() {

return radius * 2;

}

@Override

public int getheight() {

return radius * 2;

}

public void paint (Graphics graphics) {

super.paint (graphics);

graphics.drawOval(x, y, getWidth() - 1, getHeight() - 1);

}

shapes/Rectangle.java: A rectangle

package refactoring_guru.composite.example.shapes;

import java.awt.*;

public class Rectangle extends BaseShape {

public int width;

public int height;

public Rectangle(int x, int y, int width, int height, Color color) {

super (x, y, color);

this.width = width;

this.height = height;

}

@Override

public int getwidth() {

return width;

}

@Override

public int getheight() {

return height;

}

Override

public void paint (Graphics graphics) {

super.paint (graphics);

graphics.drawRect(x, y, getwidth() - 1, getHeight() - 1);

wishapes/CompoundShape.java: Compound shape, which consists of other shape objects

package refactoring_guru.composite.example.shapes;

import java.awt.*:

import java.util.Arraylist;

import java.util.Arrays;

import java.util.List;

public class CompoundShape extends BaseShape {

protected List children = new ArrayList<>();

public CompoundShape(Shape... components) {

super(0, 0, Color.BLACK);

add( components);

public void add(Shape component) {

children.add(component) ;

}

public void add(Shape... components) {

children.addAll(Arrays.asList(components));

public void remove(Shape child) {

children.remove(child);

public void remove(Shape... components) {

children.removeAll (Arrays.asList (components));

}

public void clear) {

children.clear;

@Override

public int get() {

if (children.size() == 0) {

return 0;

}

int x = children.get(0). getX();

for (Shape child : children) {

if (child.getX() < x) {

x = child.getX();

return x;

}

@Override

public int getY() {

if (children.size() == 0) {

return 0;

}

int y = children.get(0). getY();

for (Shape child : children) {

if (child.getY() < y) {

y = child.getY();

}

return y;

}

@Override

public int getwidth() {

int maxwidth = 0;

int x = getX() ;

for (Shape child : children) {

int childsRelativeX = child.getX() - x;

int childwidth = childsRelativeX + child.getwidth();

if (childwidth > maxwidth) {

maxWidth = childWidth;

return maxWidth;

}

@Override

public int getHeight() {

int maxHeight = 0;

int y = getY();

for (Shape child : children) {

int childsRelativeY = child.getY) - y;

int childheight = childsRelativeY + child.getHeight();

if (childheight > maxHeight) {

maxHeight = childHeight;

return maxHeight;

}

@Override

public void move(int x, int y) {

for (Shape child: children) {

child.move(x, y);

}

@Override

public boolean isInsideBounds(int x, int y) {

for (Shape child : children) {

if (child.isInsideBounds(x, y)) {

return true;

}

return false;

}

@Override

public void unSelect () {

super. unSelect();

for Shape child : children)

child. unSelect ();

public boolean selectChildAt(int x, int y) {

for (Shape child : children) {

if (child.isInsideBounds(x, y)) {

child.select();

return true;

return false;

dOverride

public void paint (Graphics graphics) {

if (isSelected( )) {

enableSelectionStyle(graphics);

graphics.drawRect(getX() - 1, getY() - 1, getwidth() + 1, getHeight() + 1);

disableSelectionStyle(graphics);

for (Shape child : children) {

child.paint(graphics);