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2.ÕâÀïµÄ¶ÑºÍÕ»Ê×ÏÈÒªÃ÷È·ÊÇÐéÄâ»úÕ»£¬ºÍ¼Ä´æÆ÷¸ù±¾²»ÊÇÒ»¸ö¼¶±ðµÄ¶«Î÷£¬¾Í±ð±È½ÏÁË£®
3.Õ»Êý¾Ý¹²ÏíºÃÏñÊÇ×÷Õß×Ô¼º´´ÔìµÄ¸ÅÄ¶øÇÒ¸ø»ù±¾ÀàÐÍÒ²ÒýÈëÁË£¢ÒýÓ㢵ĸÅÄ²»ÖªµÀ³öÓÚºÎÖÖ´òË㣮
javaÐéÄâ»ú¹æ·¶ÖÐ˵£ºPrimitive values do not share state with other primitive values. A variable whose type is a primitive type always holds a primitive value of that type.
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      int a=3;
      int b=3;
      int c=65535;
      int d=65535;
      int e=32330;
      int f=32330;
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Code:
  0:        iconst_3  //3
  1:        istore_1
  2:        iconst_3  //3
  3:        istore_2
  4:        ldc        #2; //int 65535
  6:        istore_3
  7:        ldc        #2; //int 65535
  9:        istore        4
  11:        sipush        32330
  14:        istore        5
  16:        sipush        32330


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import java.io.*;
class FileTest
{
 public static void main(String[] args) throws Exception
 {
  //File f=new File("1.txt");
  //f.createNewFile();
  //f.mkdir();
  //File f=new File("E:\\JavaLesson\\Lesson7\\1.txt");//ÔÚWindowsϵͳÏÂ,Óþø¶Ô ......

javaÀàÐÍѧϰ


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float ff= 1.3f;(4B)
int 4B;
long 8B;
double 8B;
byte Ò»×Ö½ÚÕûÐÍ
char 2B
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int num[] = new int[3];
int[] num;
num = new int[3];
int [] num = new int[]{1,2,3};
int [][] num;
num = new int[3][4];
//²»Í¬³¤
num = new int[3][];
num[0] = new int[5]; ......

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