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Chapter 04 _Array(core JavaÕªÒª)

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1.»ù±¾¸ÅÄ
Definition£ºÊý×é¾ÍÊÇÏàͬÀàÐÍÔªËØµÄÏßÐÔ¼¯ºÏ¡£
Array is a collection of the same data.
An array is object.
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2.Syntax
Array Copy
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1.Êý×éµÄʹÓãº
 A£®declare
int [] a=new int[3](ÉùÃ÷Ò»¸öÊý×éÀàÐ͵ijÉÔ±±äÁ¿£¬²¢´´½¨Ò»¸öÊý×é)
int[] a={};
int a[]={};
int a[][]={}
 B£®create
Sample£ºa=new int[3];
        int[] a={1,2,3};
Advanced Feature:
a£®ÔÚ¶ÑÖзÖÅäÁ¬ÐøÄÚ´æ¿Õ¼ä£»
b£®¶ÔÊý×éÔªËØ¸³È±Ê¡Öµ£»
c£®ÔÚÕ»Öдæ·ÅaÒýÓÃÀàÐͱäÁ¿£¬²¢Ö¸Ïò¶ÑÖеÄÊý×é
Tips£ºÊý×é´´½¨µÄ¹ý³Ì
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     C£®initialize£¨³õʼ»¯£©
     Example£ºa[0]=1£»
2£®¶àάÊý×飺
¹æÔòµÄ¶þάÊý×é
²»¹æÔòµÄ¶þάÊý×é
(1) declare
  Example: int[][] a1;
          int[]a2 [];
          int a3 [][];
(2)create
  Example£ºa1=new int[2][];
           a1[0]=new int[3];
         a1[1]=new int[2];
         a1[2]=new int[1];
(3) initialize:
   for (int i=0;i<a1.lengh;i++){
      for(int j=0;j<a1[i].length;j++){
         a1[i][j]=default value;
      }
   }
Advanced Features
(1) Êý×éϱ겻ҪԽ½ç£¨·ñÔòJVM throws Run


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