JAVA transient ¹Ø¼ü×Ö
transientÊÇJavaÓïÑԵĹؼü×Ö£¬ÓÃÀ´±íʾһ¸öÓò²»ÊǸöÔÏó´®Ðл¯µÄÒ»²¿·Ö¡£µ±Ò»¸ö¶ÔÏó±»´®Ðл¯µÄʱºò£¬transientÐͱäÁ¿µÄÖµ²»°üÀ¨ÔÚ´®Ðл¯µÄ±íʾÖУ¬È»¶ø·ÇtransientÐ͵ıäÁ¿ÊDZ»°üÀ¨½øÈ¥µÄ!
public class User implements Serializable{
private static final long serialVersionUID = 1L;
private Integer id;
transient private String username;
private transient String password;
// getter & setter
}
ÄÇôÄãÔÚ´®Ðл¯£¨IOÁ÷µÈ£©UserÀàʱ ¸øËüµÄid,usernameºÍpasswordÊôÐÔ¸³Öµ£¬ÄÇôÄãÔÚÌáÈ¡Userʱ£¬Äõ½ÁËidÊôÐÔ£¬µ«ÊÇÈ´Äò»µ½usernameÓëpasswordÊôÐÔ¡£
Ïà¹ØÎĵµ£º
¶ÔÓÚÕâ¸öϵÁÐÀïµÄÎÊÌ⣬ÿ¸öѧJavaµÄÈ˶¼Ó¦¸Ã¸ã¶®¡£µ±È»£¬Èç¹ûÖ»ÊÇѧJavaÍæÍæ¾ÍÎÞËùνÁË¡£Èç¹ûÄãÈÏΪ×Ô¼ºÒѾ³¬Ô½³õѧÕßÁË£¬È´²»ºÜ¶®ÕâЩÎÊÌ⣬Ç뽫Äã×Ô¼ºÖعé³õѧÕßÐÐÁС£ÄÚÈݾùÀ´×ÔÓÚCSDNµÄ¾µäÀÏÌù¡£
¡¡¡¡ÎÊÌâÒ»£ºÎÒÉùÃ÷ÁËʲô£¡
String s = "Hello world!";
¡¡¡¡Ðí¶àÈ˶¼×ö¹ýÕâÑùµÄÊÂÇ飬µ«ÊÇ£¬ÎÒÃǵ½µ×Éù ......
JavaµÄException·ÖΪÁ½À࣬һÀàÊÇRuntimeException¼°Æä×ÓÀ࣬ÁíÍâÒ»Àà¾ÍÊÇchecked
Exception¡£JavaÒªÇóº¯Êý¶ÔûÓб»catch´¦ÀíµôµÄchecked
Exception£¬ÐèÒª½«ÆäдÔÚº¯ÊýµÄÉùÃ÷²¿·Ö¡£È»¶ø£¬ÕâÒ»ÒªÇó³£³£¸ø³ÌÐòÔ±´øÀ´Ò»Ð©²»±ØÒªµÄ¸ºµ£¡£
ΪÁ˱ÜÃâÔÚº¯ÊýÉùÃ÷ÖÐдthrows²¿·Ö£¬ÔÚJavaÏîÄ¿ÀïÃæ³£³£¿ÉÒÔ¿´µ½ÒÔÏ´úÂëÓÃÀ´‘Í ......
1.¼¯ºÏµÄÌص㣺
¶¼Î»ÓÚ java.util°üÖУ¬²»ÄÜ´æ·Å»ù±¾ÀàÐ͵ÄÊý¾Ý£¬¶øÖ»ÄÜ´æ·Å¶ÔÏóµÄÒýÓ㬲Ù×÷µÄÊýÄ¿¿ÉÒÔ²»¹Ì¶¨£¨ÀàËÆÓÚ¶¯Ì¬Êý×飩¡£
2.·ÖÀࣺ
ÓÐÈý¸öÀࣺ
a.Set(¼¯)£º¶ÔÏó²»°´Ìض¨·½Ê½ÅÅÐò£¬Ã»ÓÐÖظ´ÔªËØ¡£Õâ¸öÓëÊýѧÖеļ¯ºÏ¸ÅÄî×îÏàËÆ¡£
b.List(Áбí)£º°´ÕÕË÷ÒýλÖÃÅÅÐò£¬¿ÉÒÔÓÐÖظ´ÔªËØ£¬ÔÊÐí°´ÕÕ¶ÔÏóÔÚ¼¯ºÏÖеÄË ......
1.Éú³ÉgifͼƬ¸ñʽµÄ
package com.cssweb.common.util;
import java.io.*;
import java.util.*;
import com.sun.image.codec.jpeg.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.awt.*;
import java.awt.image.*;
/*
* ¹¦ÄÜ£ºµ÷ÓÃAuthServlet¿ÉÒÔÉú³ÉÒ»¸öÑéÖ¤ÂëͼƬ,ͼƬµÄ¿í¶ÈºÍ¸ß¶È¿ÉÒ ......
Java ʵÓþÑé×ܽá --Swing ƪ
Ç°ÑÔ
±¾ÎÄÇ°ÑÔ²¿·ÖΪÎÒµÄһЩ¸ÐÏ룬Èç¹ûÄãÖ»¶Ô±¾ÎĽéÉÜµÄ Java ʵÓü¼ÇɸÐÐËȤ£¬¿ÉÒÔÌø¹ýÇ°ÑÔÖ±½Ó¿´ÕýÎĵÄÄÚÈÝ¡£
±¾ÎĵÄд×÷¶¯»úÀ´Ô´ÓÚ×î½ü½Ó¸øÈ˼ҰïæдµÄÒ»¸öС³ÌÐò£¬Ö÷ÒªÓÃÓÚ¹ÜÀí·ÖÆÚ¸¶¿îµÄ»õ¿îµÄһϵÁйÜÀí£¬°üÀ¨¹ýÆÚ¿îµÄ¼Í¼£¬¹ýÆÚ¿îÀûÏ¢µÄ¼ÆË㣬ΪÌáÇ°¸¶¿îµÄÓû§ÌṩһЩ·µ¿î½ ......