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1.
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thisµ÷ÓõÄͬÀàµÄ¹¹Ô캯Êý.
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3.1
synchronized¹Ø¼ü×ÖµÄ×÷ÓÃÓòÓжþÖÖ
3.1.1
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3.1.2
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3.2
³ýÁË·½·¨Ç°ÓÃsynchronized¹Ø¼ü×Ö£¬synchronized¹Ø¼ü×Ö»¹¿ÉÒÔÓÃÓÚ·½·¨ÖеÄij¸öÇø¿éÖУ¬±íʾֻ¶ÔÕâ¸öÇø¿éµÄ×ÊԴʵÐл¥³â·ÃÎÊ¡£Ó÷¨ÊÇ: synchronized(this){/*Çø¿é*/}£¬ËüµÄ×÷ÓÃÓòÊǵ±Ç°¶ÔÏó£»
3.3
synchronized¹Ø¼ü×ÖÊDz»Äܼ̳еģ¬Ò²¾ÍÊÇ˵£¬»ùÀàµÄ·½·¨synchronized f(){} Ôڼ̳ÐÀàÖв¢²»×Ô¶¯ÊÇsynchronized f(){}£¬¶øÊDZä³ÉÁËf(){}¡£¼Ì³ÐÀàÐèÒªÄãÏÔʽµÄÖ¸¶¨ËüµÄij¸ö·½·¨Îªsynchronized·½·¨£»


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/**
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InetAddress localHost;
InetAddress []ip;
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