求更精的代码！

/* * File: Pyramid.java * ------------------ * This program is a stub for the Pyramid problem, which draws * a brick pyramid. */import acm.program.*;import acm.graphics.*;import java.awt.*;public class Pyramid extends GraphicsProgram {public void run() {for(int i= 1;i<=BRICKS_IN_BASE; i++){for(int j= 1;j<=i;j++){ double dx = (getWidth()-i*BRICK_WIDTH)/2+(j-1)*BRICK_WIDTH; double dy = (getHeight()-(BRICKS_IN_BASE+1-i)*BRICK_HEIGHT); GRect rectangle = new GRect( dx, dy, BRICK_WIDTH, BRICK_HEIGHT); rectangle.setColor(Color.BLACK); add(rectangle);}}}private static final int BRICK_WIDTH = 30;private static final int BRICK_HEIGHT = 12;private static final int BRICKS_IN_BASE = 12;}