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/**
 * ÃæÏò¶ÔÏóÖ®Ò»
 * ÀàÓë¶ÔÏó
 */
/**
 * ¶ÔÏóµÄʵÀý»¯¹ý³Ì:
 * 1,javaÖÐËùÓÐÀàÐÍÔÚÄÚ´æµÄ·ÖÅäÇé¿ö
 * a,»ù±¾ÀàÐÍ"±äÁ¿"char,byte,short,int,long,float,double,boolean´æ´¢ÔÚ¶ÑÕ»ÖÐ
 *   ¶ÑÕ»ÊÇͨ¹ý¶ÑÕ»Ö¸Õë°´ÕÕÏȽøÏȳöµÄ¶ÁÈ¡·½Ê½´æ´¢Êý¾Ý,´æÈ¡ËÙ¶È¿ì.
 *   ¶ÑջλÓÚRAM(Ëæ»ú·ÃÎÊ´æ´¢Æ÷,¿É¶Á¿Éд)
 * b,"³£Á¿"(Ö÷Ҫָͨ¹ýfinal static¹Ø¼ü×Ö¶¨ÒåµÄ³£Á¿)´æ´¢ÔÚROM(Ö»¶Á´æ´¢Æ÷)ÖÐ
 * c,"¶ÔÏó"´æ´¢ÔÚ¶ÑÖÐ
 *   ¶Ñ°´ÕÕÏȽøºó³öµÄ´æ´¢·½Ê½´æ´¢Êý¾Ý,´æ´¢ËٶȽÏÂý.¶ÑͬÑùλÓÚRAM.
 * d,"ÒýÓÃ"´æ´¢ÔÚ¶ÑÕ»ÖÐ,´æ´¢µÄÊǶÔÏóµÄÊ×µØÖ·,²¢Í¨¹ýµØÖ·Ö¸ÕëÖ¸ÏòλÓÚ¶ÑÖеĶÔÏó.
 *
 * 2,¶ÔÏóµÄʵÀý»¯¹ý³Ì
 * ´´½¨Ò»¸öÀàµÄÒýÓÃʱ,ÈçPerson p1Õâʱ½«ÔÚ¶ÑÕ»Öд´½¨Ò»¸öÒýÓÃp1,
 * µ±p1 = new Person()ʱ,ÔÚ¶ÑÖд´½¨ÁËÒ»¸öPersonÀàÐ͵ĶÔÏó,²¢ÇÒ½«¸Ã¶ÔÏóÔÚ¶ÑÖеÄÊ×µØÖ·¸³Öµ¸øp1Õâ¸öÒýÓÃ.
 *
 * 3,ÒýÓõıȽÏ
 * ÎÒÃÇ´´½¨Á½¸ö¶ÔÏó:
 * Person p1 = new Person(); Person p2 = new Person();
 * Õâʱ,¶ÑÄÚ´æÖдæ·ÅÁËÁ½¸öPersonÀàÐ͵ĶÔÏó,ÕâÁ½¸ö¶ÔÏóµÄÊ×µØÖ·²»Ïàͬ,
 * ËùÒÔ,µÚÒ»¸ö¶ÔÏóµÄÒýÓÃp1ºÍµÚ¶þ¸ö¶ÔÏóµÄÒýÓÃp2(p1,p2´æ´¢×ŶÔÏóµÄÊ×µØÖ·)µÄÖµ²»Ïàͬ.
 *
 * 4,¶ÔÏóºÍÒýÓõÄÉúÃüÖÜÆÚ:
 * ´óÌåÀ´Ëµ,´´½¨¶ÔÏóµÄÒýÓúʹ´½¨Ò»¸ö±äÁ¿Ò»Ñù,¶¼ÊÇ·ÖÅäÔÚ¶ÑÕ»ÖеÄ,
 * ÔÚ·½·¨ÖÐÎÒÃǰ´ÕÕÏȺó˳Ðò¶¨ÒåµÄ±äÁ¿ºÍÒýÓÃ,½«Ôڸ÷½·¨½áÊøºó,ͬÑù°´ÕÕÏȶ¨ÒåÏÈÊͷŵķ½Ê½½áÊøÆäÉúÃüÖÜÆÚ.
 * µ«ÊǶÔÓÚÒ»¸öÒýÓÃ,ÓÉÓÚ´æ·ÅµÄÊǶÑÖжÔÏóµÄÊ×µØÖ·,ËùÒÔ,ÔÚ·½·¨Öе±ÎÒÃǽ«null¸³Öµ¸øÕâ¸öÒýÓÃʱ,ÀýÈçp1 = null,ͬÑù¿ÉÒÔÌáǰ½áÊøp1µÄÉúÃüÖÜÆÚ.
 * µ±p1 = nullºó,½áÊøµÄÊÇÒýÓõÄÉúÃü,µ«ÊǶÑÖеĶÔÏó²¢Ã»ÓнáÊø,¶øÕâ¸ö¶ÔÏ󽫵ȴýjavaµÄÀ¬»ø»ØÊÕÆ÷,ÔÚÒ»¸öÌØÊâµÄʱ¼ä½«ÆäÇå³ý.
 */
class Person
{
 private int age;
 public void setAge(int age)
 {
  this.age = age;
 }
 public void shout()
 {
  int age = 23;//·½·¨Öж¨ÒåµÄ¾Ö²¿±äÁ¿»á¸²¸ÇÀàÖж¨ÒåµÄͬÃûµÄ³ÉÔ±±äÁ¿;
  /*
  {
   int age = 30;//´íÎó,javaÖв»ÔÊÐíÔÚ·½·¨Öж¨ÒåÓëÈ«¾Ö±äÁ¿Í¬ÃûµÄ¾Ö


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