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2¡¢ÒÑÖªÈý¸öÀàA.BºÍC.ÆäÖÐÀàAÓÉÀàBµÄÒ»¸öʵÀàºÍÀàCµÄ1¸ö»ò¶à¸öʵÀ๹³É.Çë»­³öÄܹ»ÕýÈ·±íʾÀàA,BºÍCÖ®¼ä¹ØÏµµÄUMLÀàͼ.

3¡¢¸ù¾ÝÒÔÏÂÃèÊö»­³öÀàͼ£¬²¢×¢Ã÷¶àÖØÐÔ¹ØÏµ£ºÒ»¸öѧÉú¿ÉÒÔÑ¡ÐÞ¶àÃſγ̣¬Ò²¿ÉÄÜûÓÐÈκογ̣»Ò»Ãſγ̿ÉÒÔ±»¶à¸öѧÉúÑ¡ÐÞ£»Ò»¸öÀÏʦ¿ÉÒԽ̶àÃſγ̻òÕß²»½Ì¿Î£»Ã¿ÃſγÌÖÁÉÙÓÐÒ»¸öÀÏʦ£¬Ò²¿ÉÒÔÓжà¸öÀÏʦÈν̣»Ã¿Ãſγ̿ÉÒÔÓÐ0»ò1±¾½Ì²Ä£¬Ã¿±¾½Ì²ÄÖ»ÄÜÓÃÓÚÒ»Ãſγ̡£

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4¡¢ÏÖÓÐһϵͳÐèÒª¶ÔÉÌÆ·½øÐйÜÀí£¬°üÀ¨Ìí¼Ó£¬É¾³ýÉÌÆ·£¬ÐÞ¸ÄÉÌÆ·ÐÅÏ¢ÈýÏÄÜ£¬»­³öϵͳÀàͼ¡££¨ÉÌÆ·ÐÅÏ¢°üÀ¨ÉÌÆ·±àºÅ£¬ÉÌÆ·Ãû³Æ£¬¼Û¸ñ£¬Éú²ú³§É̵ȣ©

5¡¢ÉÏÌ⣬Èç¹ûÏÖÔÚϵͳÐèÇó·¢Éú±ä»¯£¬ÐèÒªÄܹ»¶ÔËð»µÉÌÆ·½øÐдòÕÛ£¬ÒÔ¼°¿ÉÒÔ°´ÕÕÉÌÆ·µÄÑÕÉ«ºÍÍâÐνøÐвéѯ£¬ÔòϵͳÀàͼӦ¸ÃÈçºÎÐ޸ģ¿ 6¡¢¸ù¾ÝÏÂÃæµÄ´úÂë»­³öInvoiceÀàµÄÀàͼ£¬ÒªÇó±êÃ÷¸÷ÊôÐÔµÄÀàÐͺͿɼûÐÔÒÔ¼°Àà·½·¨¡£

public class Invoice {

public double amount;

public Date date = new Date(); public string customer;

public string specification;

public string administrator = ¡°unspecified¡±; static private int number_of_invoices()=0; public invoice£¨£©£» {

number_of_invoices++£» }

public void print£¨£© {

System.out.println(\number of invoices is¡±+ int

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