Untitled

import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.Graphics;
import java.awt.Color;
import java.security.SecureRandom;

public class PolyShapes {
	public static void main(String... args) {
		JFrame application = new JFrame();
		application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		application.setSize(250, 250);
		Shapes shapes = new Shapes();
		application.add(shapes);
		shapes.createShapes();



		application.setVisible(true);

	}
}

class Shapes extends JPanel {
	private MyShape shapes[] = new MyShape[10];

	public void createShapes() {
		SecureRandom random = new SecureRandom();

		int width = getWidth();
		int height = getHeight();
		
		System.out.printf("%d, %d",width, height);
		for (int i = 0; i < 10; i++) {
			int x1 = random.nextInt(width);
			int y1 = random.nextInt(height);
			int x2 = random.nextInt(width);
			int y2 = random.nextInt(height);
			float r = random.nextFloat();
			float g = random.nextFloat();
			float b = random.nextFloat();
			Color randomColor = new Color(r, g, b);
			boolean filled = random.nextBoolean();

			if (i%2 == 0)
				shapes[i] = new MyRect(x1, y1, x2, y2, randomColor, filled);
			else
				shapes[i] = new MyLine(x1, y1, x2, y2, randomColor);
		}
	}

	public void paintComponent(Graphics g) {
		super.paintComponent(g);
		for (int i = 0; i < 10; i++) {
			shapes[i].draw(g);
		}
	}
}

class MyRect extends MyShape {
	private boolean filled = false;

	@Override public void draw(Graphics g) {
		g.setColor(getColor());
		g.fillRect(getX1(), getY1(), getX2(), getY2());
	}

	public MyRect(int x1, int y1, int x2, int y2, Color color, boolean filled) {
		setX1(x1);
		setY1(y1);
		setX2(x2);
		setY2(y2);
		setColor(color);
		this.filled = filled;
	}
}

class MyLine extends MyShape {
	
	@Override public void draw(Graphics g) {
		g.setColor(getColor());
		g.drawLine(getX1(), getY1(), getX2(), getY2());
	}

	public MyLine(int x1, int y1, int x2, int y2, Color color) {
		setX1(x1);
		setY1(y1);
		setX2(x2);
		setY2(y2);
		setColor(color);
	}
}


abstract class MyShape extends JPanel {
	private int x1;
	private int y1;
	private int x2;
	private int y2;
	private Color color;

	public MyShape() {
		this.x1 = 0;
		this.y1 = 0;
		this.x2 = 0;
		this.y2 = 0;
		color = Color.BLACK;
	}

	public MyShape(int x1, int y1, int x2, int y2, Color color) {
		this.x1 = x1;
		this.y1 = y1;
		this.x2 = x2;
		this.y2 = y2;
		this.color = color;
	}
	//public abstract void paintComponent(Graphics g);
	public abstract void draw(Graphics g);

	public void paintComponent(Graphics g) {
		super.paintComponent(g);
		draw(g);
	}

	public Color getColor() { return color; }
	public void setColor(Color color) { this.color = color; }

	public int getX1() { return x1; }
	public void setX1(int x) { x1 = x; }

	public int getY1() { return y1; }
	public void setY1(int y) { y1 = y; }

	public int getX2() { return x2; }
	public void setX2(int x) { x2 = x; }

	public int getY2() { return y2; }
	public void setY2(int y) { y2 = y; }
}