Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

javaÖÐÈÕÆÚ¡¢ÈÕÆÚ¸ñʽ¡¢ÈÕÆÚ¼ÆËãѧϰ±Ê¼Ç

2. Calendar ¶ÔÏóµÄÈÝ´íÐÔ£¬Lenient ÉèÖà ÎÒÃÇÖªµÀÌØ¶¨µÄÔ·ÝÓв»Í¬µÄÈÕÆÚ£¬µ±Ò»¸öÓû§¸ø³ö´íÎóµÄÈÕÆÚʱ£¬Calendar ÈçºÎ´¦ÀíµÄÄØ£¿ import java.io.*;
import java.util.*; public class WhatIsCalendar
{
    public static void main(String[] args) throws Exception{
        Calendar cal1 = Calendar.getInstance();
        cal1.set(2000, 1, 32, 0, 0, 0);
        System.out.println(cal1.getTime());
        cal1.setLenient(false);
        cal1.set(2000, 1, 32, 0, 0, 0);
        System.out.println(cal1.getTime());
    }
} ËüµÄÖ´Ðнá¹ûÊÇ£º Tue Feb 01 00:00:00 PST 2000
Exception in thread "main" java.lang.IllegalArgumentException
    at java.util.GregorianCalendar.computeTime(GregorianCalendar.java:1368)
    at java.util.Calendar.updateTime(Calendar.java:1508)
    at java.util.Calendar.getTimeInMillis(Calendar.java:890)
    at java.util.Calendar.getTime(Calendar.java:871)
    at WhatIsCalendar.main(WhatIsCalendar.java:12) µ±ÎÒÃÇÉèÖøà Calendar Ϊ Lenient false ʱ£¬Ëü»áÒÀ¾ÝÌØ¶¨µÄÔ·ݼì²é³ö´íÎóµÄ¸³Öµ¡£ 3. ²»Îȶ¨µÄ Calendar ÎÒÃÇÖªµÀ Calendar ÊÇ¿ÉÒÔ±» serialize µÄ£¬µ«ÊÇÎÒÃÇҪעÒâÏÂÃæµÄÎÊÌâ import java.io.*;
import java.util.*; public class UnstableCalendar implements Serializable
{     public static void main(String[] args) throws Exception{
        Calendar cal1 = Calendar.getInstance();
        cal1.set(2000, 7, 1, 0, 0 , 0);
        cal1.set(Calendar.MILLISECOND, 0);
        ObjectOutputStream out =


Ïà¹ØÎĵµ£º

Java ÖÐÀàºÍ·½·¨ÐÞÊηû

Java ÖÐÀàºÍ·½·¨ÐÞÊηû
ÀàµÄÐÞÊÎ
·ÃÎÊÐÞÊηû ÐÞÊηû class ÀàÃû extends ¸¸ÀàÃû³Æ implements ½Ó¿ÚÃû³Æ£¨notes: ·ÃÎÊÐÞÊηû·ûÓëÐÞÊηûµÄλÖÿÉÒÔ»¥»»£©
·ÃÎÊÐÞÊηû
Ãû³Æ
˵Ã÷
±¸×¢
pubic
¿ÉÒÔ±»ËùÓÐÀà·ÃÎÊ(ʹÓÃ)
public Àà±ØÐ붨ÒåÔÚºÍÀàÃûÏàͬµÄͬÃûÎļþÖÐ
package
¿ÉÒÔ±»Í¬Ò»¸ö°üÖеÄÀà·ÃÎÊ(ʹÓÃ)
ĬÈϵķÃÎ ......

javaÉú³Éxml¸ñʽÊý¾Ý

//»ñÈ¡Êý¾Ý¿âÊý¾Ý·µ»Ølist
public List queryAll(int fcateId) {
List list = new ArrayList();
String sql = "select * from g_Account where fCateID=? order by fCode";
Connection con = SqlHelp.getConn();//»ñµÃÁ¬½Ó£¬sqlhelp×Ô¼ºÐ´µÄ¹¤¾ßÀà
PreparedStatement pst = null;
ResultSet rs = null;
......

javaµÄ·¢Éä»úÖÆ

Person p=new Person();
ÕâÊÇʲô?µ±È»ÊÇʵÀý»¯Ò»¸ö¶ÔÏóÁË.¿ÉÊÇÕâÖÖʵÀý»¯¶ÔÏóµÄ·½·¨´æÔÚÒ»¸öÎÊÌâ,ÄǾÍÊDZØÐëÒªÖªµÀÀàÃû²Å¿ÉÒÔʵÀý»¯ËüµÄ¶ÔÏó,ÕâÑùÎÒÃÇÔÚÓ¦Ó÷½Ãæ¾Í»áÊܵ½ÏÞÖÆ.ÄÇôÓÐûÓÐÕâÑùÒ»ÖÖ·½Ê½,ÈÃÎÒÃDz»ÖªµÀÕâ¸öÀàµÄÀàÃû¾Í¿ÉÒÔʵÀý»¯ËüµÄ¶ÔÏóÄØ?Thank Goodness!ÐÒ¿÷ÎÒÃÇÓõÄÊÇjava, java¾ÍÌṩÁËÕâÑùµÄ»úÖÆ.
1).ja ......

Java´ò°ü³É¿ÉÖ´ÐÐÎļþ²½ÖèÏê½â

ºËÐÄ˼Ï룺°Ñº¬main·½·¨µÄÈë¿ÚÀàÌí¼Óµ½MANIFEST.MFÎļþÖС£
²½Ö裺
¼ÙÉèÓÐÁ½¸öÀàÎļþÒª´ò°ü£¬ËüÃÇ·Ö±ðÊôÓÚ²»Í¬µÄpackage¡£
package com.test.jar;   
import java.awt.*;   
import javax.swing.*;   
public class Jar extends JFrame   
{  ......

JAVA¶ÁÈ¡PropertiesÎļþµÄÁùÖÖ·½·¨

 
ʹÓÃJ2SEAPI¶ÁÈ¡PropertiesÎļþµÄÁùÖÖ·½·¨
¡¡¡¡1¡£Ê¹ÓÃjava.util.PropertiesÀàµÄload()·½·¨Ê¾Àý£ºInputStream in=lnew BufferedInputStream(new FileInputStream(name));
properties p=newProperties(); p.load(in);
¡¡¡¡2¡£Ê¹ÓÃjava.util.ResourceBundleÀàµÄgetBundle()·½·¨Ê¾Àý£ºResourceBundle rb=ResourceBu ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ