编写程序用大块字母表示:“Welcome to java !”,没个字母由与它表示的同样的字母组成,占7行,例如W表示如下:
               w                     w
                w                   w
                 w        w        w
                  w      w  w     w 
                   w    w    w   w
                    w  w      w w 
                     w         w
恳求大哥门帮忙