ator()·½·¨À´Çø·ÖÖظ´Óë·ñ¡£equals()ÊÇÅжÁÁ½¸öSetÊÇ·ñÏàµÈ¡£equals()ºÍ==·½·¨¾ö¶¨ÒýÓÃÖµÊÇ·ñÖ¸Ïòͬһ¶ÔÏóequals()ÔÚÀàÖб»¸²¸Ç£¬ÎªµÄÊǵ±Á½¸ö·ÖÀëµÄ¶ÔÏóµÄÄÚÈݺÍÀàÐÍÏàÅäµÄ»°£¬·µ»ØÕæÖµ¡£
17.Êý×éÓÐûÓÐlength()Õâ¸ö·½·¨ StringÓÐûÓÐlength()Õâ¸ö·½·¨£¿
´ð£ºÊý×éûÓÐlength()Õâ¸ö·½·¨£¬ÓÐlengthµÄÊôÐÔ¡£StringÓÐÓÐlength()Õâ¸ö·½·¨¡£
18.sleep() ºÍ wait() ÓÐʲôÇø±ð
´ð£ºsleep()·½·¨ÊÇʹÏß³ÌÍ£Ö¹Ò»¶Îʱ¼äµÄ·½·¨¡£ÔÚsleep ʱ¼ä¼ä¸ôÆÚÂúºó£¬Ï̲߳»Ò»¶¨Á¢¼´»Ö¸´Ö´ÐС£ÕâÊÇÒòΪÔÚÄǸöʱ¿Ì£¬ÆäËüÏ߳̿ÉÄÜÕýÔÚÔËÐжøÇÒûÓб»µ÷¶ÈΪ·ÅÆúÖ´ÐУ¬³ý·Ç(a)¡°ÐÑÀ´¡±µÄÏ߳̾ßÓиü¸ßµÄÓÅÏȼ¶(b)ÕýÔÚÔËÐеÄÏß³ÌÒòΪÆäËüÔÒò¶ø×èÈû¡£
wait()ÊÇÏ߳̽»»¥Ê±£¬Èç¹ûÏ̶߳ÔÒ»¸öͬ²½¶ÔÏóx ·¢³öÒ»¸öwait()µ÷Ó㬸ÃÏ̻߳áÔÝÍ£Ö´ÐУ¬±»µ÷¶ÔÏó½øÈëµÈ´ý״̬£¬Ö±µ½±»»½ÐÑ»òµÈ´ýʱ¼äµ½¡£