Chapter 05 _Objects and Classes(core JavaÕªÒª)
Basic concepts in OOP
Encapsulation:Òþ²ØʵÏÖ¹ý³Ì£¬¶ÔÍâÌṩ¹«¿ªÒ»ÖµĽӿڡ¢Ê¹Èí¼þÒ×ÓÚ¸üÐÂÓëά»¤¡£
Polymorphism£ºÒ»¸öÊÂÎï×Ô¶¯»ñµÃÁíÒ»ÊÂÎïµÄ״̬ÐÐΪµÄ»úÖÆ¡£
Inheritance£ºÒ»¸öÀà×Ô¶¯»ñµÃÁíÒ»¸öÀàµÄÊôÐÔ»òÕß·½·¨µÄ¹ý³Ì¡£
1.ÀàµÄ½á¹¹
ˈ̞
ÊôÐÔÃû
¾²Ì¬ÊôÐÔ
ʵÀýÊôÐÔ£º±ØÐëÒÀÀµÓÚ¶ÔÏó/ʵÀý
·½·¨
¾²Ì¬·½·¨
ʵÀý·½·¨
¹¹ÔìÆ÷
ȱʡ¹¹ÔìÆ÷
´ø²ÎµÄ¹¹ÔìÆ÷
¾²Ì¬´úÂë¿é
ʵÀý´úÂë¿é
2.²ÎÊý´«µÝ
¶ÔÓÚ»ù±¾ÀàÐÍ£¬½«Êµ¼Ê²ÎÊýµÄÖµÔÑùµÄ¸´ÖÆÒ»±é´«Öµ;
¶ÔÓÚÒýÓÃÀàÐÍ£¬½«ÒýÓÃÀàÐͱäÁ¿µÄµØÖ·Öµ¸´ÖƸøʵ²Î¡£
3.Where can we use “this”£¿
A.ʵÀý±äÁ¿ÓÚ¾Ö²¿±äÁ¿Í¬Ãû£¬ÓÃthis¡£ÊµÀý±äÁ¿ÃûÀ´ºÍ¾Ö²¿±äÁ¿¼ÓÒÔÇø·Ö;
B.ÔÚ¹¹ÔìÆ÷µÄÖØÔصÄʱºò£¬ÓÃthisÀ´µ÷ÓÃÆäËûµÄ¹¹ÔìÆ÷;
C.ÔÚʵÀý·½·¨ÖУ¬ÓÃÀ´½«µ±Ç°¶ÔÏóµÄÒýÓô«µÝ¸øÁíÍâµÄ·½·¨¡£
4.·½·¨µÄÖØÔØ
A.·½·¨ÃûÒªÏàͬ;
B.ÔÚÒ»¸öÀàÖУ¬¶à¸ö·½·¨¾ßÓв»Í¬µÄ·½·¨Ç©Ãû(²ÎÊýÀàÐÍ/²ÎÊý¸öÊý/²ÎÊý˳Ðò)£¬·½·¨¿ÉÒÔÖØÔØ
C.·µ»ØÀàÐͲ»×÷ÒªÇó
5.ÀàµÄ³õʼ»¯µÄ¹ý³Ì£º
ÀàµÄ¾²Ì¬³ÉÔ±ÔÚÀà±»¼ÓÔصÄʱºò½øÐгõʼ»¯!
(1) ÔÚ¶ÑÖзÖÅä¿Õ¼ä;
(2) ¸ø¶ÔÏóµÄÊôÐÔ¸³Ä¬ÈÏÖµ
boolean=false;
»ù±¾ÀàÐÍ=0;
ÒýÓÃÀàÐÍ=null;
&nbs
Ïà¹ØÎĵµ£º
ListµÄÓ÷¨
List°üÀ¨List½Ó¿ÚÒÔ¼°List½Ó¿ÚµÄËùÓÐʵÏÖÀà¡£ÒòΪList½Ó¿ÚʵÏÖÁËCollection½Ó¿Ú£¬ËùÒÔList½Ó¿ÚÓµÓÐCollection½Ó¿ÚÌṩµÄËùÓг£Ó÷½·¨£¬ÓÖÒòΪListÊÇÁбíÀàÐÍ£¬ËùÒÔList½Ó¿Ú»¹ÌṩÁËһЩÊʺÏÓÚ×ÔÉíµÄ³£Ó÷½·¨£¬Èç±í1Ëùʾ¡£
±í1 List½Ó¿Ú¶¨ÒåµÄ³£Ó÷½·¨¼°¹¦ÄÜ
´Ó±í1¿ÉÒÔ¿´³ö£¬List½Ó¿ÚÌṩµÄÊʺÏÓÚ×ÔÉíµÄ ......
package com;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Pattern;
public class RegexUtil {
private static Pattern PATTERN_EMAIL = Pattern
.compile("^[\\w-]+(\\.[\\w-]+)*@[\\w-]+(\\.[\\w-]+)+$");// ÓʼþµØÖ·
private static Pattern PATTERN_TEL = Pattern
.compi ......
ÔËËã·ûÓÅÏȼ¶±í
ÓÅÏȼ¶
ÔËËã·û
½áºÏÐÔ
1
() [] .
´Ó×óµ½ÓÒ
2
! +(Õý) -(¸º) ~ ++ --
´ÓÓÒÏò×ó
3
* / %
´Ó×óÏòÓÒ
4
+(¼Ó) -(¼õ)
´Ó×óÏòÓÒ
5
<< >> >>>
´Ó×óÏòÓÒ
6
< <= > >= instanceof
´Ó×óÏòÓÒ
7
== !=
´Ó×óÏòÓÒ
8
&(°´Î»Óë)
´Ó×óÏòÓÒ
9
^
´Ó×óÏòÓÒ ......
import java.applet.*;
import java.awt.*;
import java.io.*;
import java.net.URL;
import java.util.*;
public class Typewriter4 extends Applet implements Runnable
{
AudioClip hit, cr, ding ;
boolean alreadyRun = false,
& ......
×ܵĸñʽÊÇ£º
%[argument_index$][flags][width][.precision]conversion
ÀýÈ磺
%2$-5.2s
//2$£ºÈ¡µÚ¶þ¸ö²ÎÊý
//-: Ö¸¶¨Îª×ó¶ÔÆ룬ĬÈÏÓÒ¶ÔÆë
//5£º×î´óÊä³ö¿í¶ÈΪ20,²»¹»»á²¹¿Õ¸ñ£¬Êµ¼ÊÈô³¬¹ýÔòÈ«²¿Êä³ö
//.2£ºÔڴ˱íʾÊä³ö²ÎÊý2µÄ×î´ó×Ö·ûÊýÁ¿£¬Èç¹ûÊǸ¡µãÊý×Ö£¬Ôò±íʾСÊý²¿·ÖÏÔʾµÄλÊý
//s £º±íʾÊäÈë²ÎÊýÊÇ×Ö ......