Java翁恺网易公开课Shapes.zip

package shapes; import java.awt.Graphics; import java.util.ArrayList; import javax.swing.JFrame; import javax.swing.JPanel; public class Picture extends JFrame { private static final long serialVersionUID = 1L; private int width; private int height; private ArrayList<Shape> listShape = new ArrayList<Shape>(); private class ShapesPanel extends JPanel { private static final long serialVersionUID = 1L; @Override protected void paintComponent(Graphics g) { super.paintComponent(g); for ( Shape s : listShape ) { s.draw(g); } } } public void add(Shape s) { listShape.add(s); } public Picture(int width, int height) { add(new ShapesPanel()); this.setDefaultCloseOperation(EXIT_ON_CLOSE); this.width = width; this.height = height; } public void draw() { setLocationRelativeTo(null); setSize(width, height); setVisible(true); } }