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  . ³£¼ûµÄÊý×é´íÎóΪ : ArrayIndexOutOfBoundsException  (Êý×éÔ½½ç´íÎó)
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  . ÕýÈ·µÄ³õʼ»¯: int[] num={1,2,3}; ÓÖ»òÕß: int num[]= new int[]{1,2,3}
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  . System.out.print ÊÇstatic·½·¨, ²»ÐèÒªnew´´½¨.
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  . Static  : ¿ÉÒÔÓ¦ÓÃÓÚÄÚ²¿Àà,·½·¨, ±äÁ¿.
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 . native  : ½öÐÞÊη½·¨, Ö¸Ã÷´úÂëÌå²»ÊÇÓÃjava¶øÊÇÓÃc»òÒÔc++Ëùд
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