Circle.java

package lesson6.shapes;

import java.awt.*;

public class Circle extends Shape {

    public Circle() {
    }

    @Override
    public void draw(Graphics g) {

        System.out.println("Draw circle");
        g.setColor(new Color(0, 240, 40));
        g.drawOval(50, 50, 100, 100);
    }
}

Launcher2.java

package lesson6.shapes;

import java.awt.*;

/**
 * Created by anna on 19.11.15.
 */
public class Launcher2 {

    public static void main(String[] args) {

        Shape shape = new Shape();
        new ShapesTemplate(shape.fillShapeArr());
    }
}

Rectangle.java

package lesson6.shapes;

import java.awt.*;

public class Rectangle extends Shape {

    public Rectangle() {
    }

    @Override
    public void draw(Graphics g) {

        System.out.println("Draw rectangle");
        g.setColor(new Color(255, 90, 90));
        g.fillRect(150, 150, 100, 200);
    }
}

Shape.java

package lesson6.shapes;

import java.awt.*;

public class Shape{

    public Shape() {
    }

    public void draw(Graphics g) {
    }

    public Shape[] fillShapeArr() {

        Shape[] shape = new Shape[3];
        shape[0] = new Triangle();
        shape[1] = new Circle();
        shape[2] = new Rectangle();

        return shape;
    }
}

ShapesTemplate.java

package lesson6.shapes;

import java.awt.Dimension;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.WindowConstants;

public class ShapesTemplate extends JPanel {

    private Shape[] shapes;

    public ShapesTemplate(Shape[] shapes) {
        this.shapes = shapes;
        if (shapes == null || shapes.length < 1) {
            this.shapes = new Shape[0];
        }

        JFrame frame = new JFrame("DAY 6, 2D Graphics");
        frame.setLocation(750, 150);
        frame.setMinimumSize(new Dimension(600, 400));
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.getContentPane().add(this);
        frame.pack();
        frame.setVisible(true);

        repaint();
    }

    @Override
    protected void paintComponent(Graphics g) {
        for (Shape s : shapes) {
            s.draw(g);
        }
    }
}

Triangle.java

package lesson6.shapes;

import java.awt.*;

public class Triangle extends Shape {

    public Triangle() {
    }

    @Override
    public void draw(Graphics g) {

        System.out.println("Draw triangle");
        g.setColor(new Color(0, 0, 255));
        int[] arrayX = {300, 600, 450};
        int[] arrayY = {100, 100, 300};
        
        Graphics2D g2d = (Graphics2D) g;
        g2d.setStroke(new BasicStroke(3));
        
        g.drawPolygon(arrayX, arrayY, 3);
        
        g2d.setStroke(new BasicStroke());
    }
}