Задача 3. Игра.

Оригинальное условие задачи для Java

Дополнительные материалы по графическим приложениям java

• Как сделать свой "canvas" с отрисовкой чего-либо.

stackoverflow:

In order to make a custom 'Canvas' in swing you usually write a subclass of a JPanel. Then, you must overwrite the protected paintComponent(Graphics g) method of JPanel.

In the paint method, you can call methods on the Graphics object to actually draw on the JPanel.

As always, the Java Tutorials have a great reference on this to get you started. Example from there:

class MyPanel extends JPanel {

    public MyPanel() {
        setBorder(BorderFactory.createLineBorder(Color.black));
    }

    public Dimension getPreferredSize() {
        return new Dimension(250,200);
    }

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

        // Draw Text
        g.drawString("This is my custom Panel!",10,20);
    }  
}