运用OOAD（面向对象分析与设计）的理念来实现圣诞树的打印

package ooad; /** * main method * display trunk of tree * @author mm */ public class Trunk extends Shape{ /** * defaulted constructor */ public Trunk(){ } /** * to print trunk of tree */ public void print(){ for(int i = 0 ; i < 3; i++){ for(int j = 0 ; j < 4;j++) System.out.print(" "); System.out.println("*"); } } }