·¢²¼Ê±¼ä : ÐÇÆÚÈý ÎÄÕµÚ4ÕÂÃæÏò¶ÔÏó(ÏÂ)_²¹³ä°¸Àý¿Î¼þ¸üÐÂÍê±Ï¿ªÊ¼ÔĶÁ
²©Ñ§¹È¡ª¡ªÈÃIT½Ìѧ¸ü¼òµ¥£¬ÈÃITѧϰ¸üÓÐЧ
4¡¢ Éè¼Æ˼·£¨ÊµÏÖÔÀí£©
1£©±àдһ¸öfinal¹Ø¼ü×ÖÐÞÊεÄFuÀ࣬ÀàÌå¿ÉÒÔΪ¿Õ 2£©±àдZiÀ࣬ZiÀà¼Ì³ÐÓÚFuÀ࣬ÀàÌå¿ÉÒÔΪ¿Õ 3£©¶¨Òå²âÊÔÀàExample06¡£
¶þ¡¢°¸ÀýʵÏÖ
1¡¢±àдfinalÐÞÊεÄFuÀ࣬ZiÀà¼Ì³ÐFuÀ࣬´úÂëÈçÏ£º
final class Fu { }
//ZiÀà¼Ì³ÐfinalÐÞÊεÄFuÀà class Zi extends Fu { }
// ÀàÌåΪ¿Õ´úÂë // ÀàÌåΪ¿Õ´úÂë
2¡¢¶¨Òå²âÊÔÀàExample06£¬´úÂëÈçÏ£º
public class Example06{ }
public static void main(String[] args) { }
Zi zi = new Zi();
ÔËÐнá¹ûÈçͼ4-6Ëùʾ¡£
ͼ4-6 ÔËÐнá¹û
Èý¡¢°¸Àý×ܽá
ÔÚJavaÖУ¬±»final¹Ø¼ü×ÖÐÞÊεÄÀàΪ×îÖÕÀ࣬²»Äܱ»ÆäËüÀà¼Ì³Ð¡£
°¸Àý4-7 finalÐÞÊη½·¨ Ò»¡¢°¸ÀýÃèÊö
1¡¢ ¿¼ºË֪ʶµã ±àºÅ£º00104004 Ãû³Æ£ºfinal¹Ø¼ü×Ö 2¡¢ Á·Ï°Ä¿±ê
9
²©Ñ§¹È¡ª¡ªÈÃIT½Ìѧ¸ü¼òµ¥£¬ÈÃITѧϰ¸üÓÐЧ
? ÕÆÎÕʹÓÃfinal¹Ø¼ü×ÖÐÞÊη½·¨
3¡¢ ÐèÇó·ÖÎö
×ÓÀà¿ÉÒԼ̳и¸ÀàµÄ³ÉÔ±·½·¨£¬²¢ÔÚ±ØҪʱ¶Ô·½·¨½øÐÐÖØд£¬Ôö¼ÓÁË·½·¨µÄÀ©Õ¹µÄͬʱҲ´òÆÆÁË·½·¨µÄ·â×°£¬Èç¹ûÎÒÃÇÏ£Íû¸¸ÀàÖеÄijЩ·½·¨²»Äܱ»ÖØд£¬Õâʱ¾Í¿ÉÒÔʹÓÃfinal¹Ø¼ü×ÖÀ´ÐÞÊΡ£ÎªÁËÈóõѧÕßÕÆÎÕʹÓÃfinal¹Ø¼ü×ÖÐÞÊη½·¨£¬±¾°¸Àý½«·Ö±ðÉè¼ÆÁ½¸öÀ࣬һ¸öÊÇFuÀ࣬ÆäÖж¨ÒåÁËfinalÐÞÊεÄshow()·½·¨£¬ÁíÒ»¸öÊǼ̳ÐFuÀàµÄZiÀ࣬ÔÚZiÀàÖжÔshow()·½·¨½øÐÐÖØд¡£ 4¡¢ Éè¼Æ˼·£¨ÊµÏÖÔÀí£©
1£©±àдһ¸öFuÀ࣬ÀàÖж¨ÒåfinalÐÞÊεÄshow()·½·¨¡£
2£©±àдZiÀ࣬ZiÀà¼Ì³ÐÓÚFuÀ࣬ÔÚZiÀàÖжÔshow()·½·¨½øÐÐÖØд 3£©¶¨Òå²âÊÔÀàExample07£¬´´½¨ZiÀà¶ÔÏ󣬲¢µ÷ÓÃZiÀàshow()·½·¨¡£
¶þ¡¢°¸ÀýʵÏÖ
1¡¢±àдFuÀ༰Æä×ÓÀàZiÀ࣬ÔÚZiÀàÖжÔshow()·½·¨ÖØд£¬´úÂëÈçÏ£º
class Fu { }
class Zi extends Fu { }
//ÖØд¸¸ÀàÖÐfinalÐÞÊεķ½·¨ public void show() { }
System.out.println(\ÕâÊÇÒ»¶ÑÀ¬»ø£¬¸ø´¦ÀíÁË\//final¹Ø¼ü×ÖÐÞÊεķ½·¨ public final void show() { }
System.out.println(\ÕâÊǾøÃÜ×ÊÔ´\
2¡¢¶¨Òå²âÊÔÀàExample07£¬´úÂëÈçÏ£º
public class Example07{ }
public static void main(String[] args) { }
Zi z = new Zi(); z.show();
ÔËÐнá¹ûÈçͼ4-7Ëùʾ¡£
ͼ4-7 ÔËÐнá¹û
10
²©Ñ§¹È¡ª¡ªÈÃIT½Ìѧ¸ü¼òµ¥£¬ÈÃITѧϰ¸üÓÐЧ
Èý¡¢°¸Àý×ܽá
µ±Ò»¸öÀàµÄ·½·¨±»final¹Ø¼ü×ÖÐÞÊκó£¬Õâ¸öÀàµÄ×ÓÀཫ²»ÄÜÖØд¸Ã·½·¨¡£
°¸Àý4-8 finalÐÞÊξֲ¿±äÁ¿ Ò»¡¢°¸ÀýÃèÊö
1¡¢ ¿¼ºË֪ʶµã ±àºÅ£º00104004 Ãû³Æ£ºfinal¹Ø¼ü×Ö
2¡¢ Á·Ï°Ä¿±ê
? ÕÆÎÕʹÓÃfinal¹Ø¼ü×ÖÐÞÊξֲ¿±äÁ¿
3¡¢ ÐèÇó·ÖÎö
JavaÖб»finalÐÞÊεıäÁ¿Îª³£Á¿£¬ËüÖ»Äܱ»¸³ÖµÒ»´Î£¬Ò²¾ÍÊÇ˵finalÐÞÊεıäÁ¿Ò»µ©±»¸³Öµ£¬ÆäÖµ²»Äܸı䡣ΪÁËÈóõѧÕßÕÆÎÕʹÓÃfinal¹Ø¼ü×ÖÐÞÊξֲ¿±äÁ¿£¬±¾°¸Àý½«ÔÚÀàµÄ·½·¨Öж¨ÒåÒ»¸öfinalÐÞÊεľֲ¿±äÁ¿£¬²¢ÊÔ×ŶԸñäÁ¿ÖØи³Öµ¡£
4¡¢ Éè¼Æ˼·£¨ÊµÏÖÔÀí£©
1£©±àдһ¸öExample08À࣬ÀàÖж¨ÒåÀàÒ»¸öfinalÐÞÊεľֲ¿±äÁ¿age£¬ÎªÆ丳³õʼֵΪ18¡£ 2£©ÎªageÖØи³ÖµÎª20¡£
¶þ¡¢°¸ÀýʵÏÖ
1¡¢±àдÀàExample08£¬´úÂëÈçÏÂ
public class Example08{ }
public static void main(String[] args) { }
final int age = 18; // µÚÒ»´Î¿ÉÒÔ¸³Öµ age = 20; // Ôٴθ³Öµ»á±¨´í
±àÒë´íÎó£¬Èçͼ4-8Ëùʾ¡£
ͼ4-8 ´íÎóÌáʾ
11
²©Ñ§¹È¡ª¡ªÈÃIT½Ìѧ¸ü¼òµ¥£¬ÈÃITѧϰ¸üÓÐЧ
Èý¡¢°¸Àý×ܽá
finalÐÞÊεıäÁ¿±íʾ³£Á¿£¬Ò»¾¶¨Òå¾Í²»ÄÜÖØи³Öµ¡£
°¸Àý4-9 finalÐÞÊγÉÔ±±äÁ¿ Ò»¡¢°¸ÀýÃèÊö
1¡¢ ¿¼ºË֪ʶµã
±àºÅ£º00104004 Ãû³Æ£ºfinal¹Ø¼ü×Ö
2¡¢ Á·Ï°Ä¿±ê
? ÕÆÎÕʹÓÃfinal¹Ø¼ü×ÖÐÞÊγÉÔ±±äÁ¿
3¡¢ ÐèÇó·ÖÎö
ÔÚJavaÖУ¬finalÐÞÊεıäÁ¿±íʾ³£Á¿£¬Ò»¾¶¨Òå¾Í²»ÄÜÖØи³Öµ¡£ÎªÁËÈóõѧÕßÊìϤfinalÐÞÊαäÁ¿µÄÇé¿ö£¬±¾°¸Àý½«Ê¹ÓÃfinal¹Ø¼ü×ÖÐÞÊγÉÔ±±äÁ¿£¬¹Û²ìÆäÊÇ·ñÄܹ»Ôٴθ³Öµ¡£ 4¡¢ Éè¼Æ˼·£¨ÊµÏÖÔÀí£©
1£©±àдһ¸öFuÀ࣬¸¸ÀàÖж¨ÒåÒ»¸ö±äÁ¿X£¬²¢ÓÃfinal¹Ø¼ü×ÖÐÞÊαäÁ¿¡£ 2£©±àдZiÀ࣬ZiÀà¼Ì³ÐÓÚFuÀ࣬ÔÚ×ÓÀàÖжԳ£Á¿ÔÙ¸³ÐÂÖµ¡£ 3£©¶¨Òå²âÊÔÀàExample09£¬¹Û²ìÔËÐнá¹û¡£
¶þ¡¢°¸ÀýʵÏÖ
1¡¢±àдFuÀ༰Æä×ÓÀàZiÀ࣬ÔÚZiÀàÖжÔXÔÙ¸³Öµ£¬´úÂëÈçÏ£º
class Fu { }
class Zi extends Fu { }
X = 20;//ÔÚ×ÓÀàÖжԳ£Á¿ÔÙ¸³ÐÂÖµ public void method() { }
System.out.println(X); //finalÐÞÊεıäÁ¿£¬Ò²¾ÍÊdz£Á¿ public final int X = 10;
2¡¢¶¨Òå²âÊÔÀàExample09£¬´úÂëÈçÏ£º
public class Example09{
public static void main(String[] args) { }
12
Zi z = new Zi(); z.method();