Effective Java¶ÁÊé±Ê¼Ç
package chape8;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
/**
* µÚ°ËÕ ͨÓóÌÐòÉè¼Æ
* µÚ45Ìõ£º ½«¾Ö²¿±äÁ¿µÄ×÷ÓÃÓò¼õСµ½×îС
* ½«¾Ö²¿±äÁ¿µÄ×÷ÓÃÓò×îС»¯¡£¿ÉÒÔÔöÇ¿´úÂëµÄ¿É¶ÁºÍ¿Éά»¤ÐÔ£¬²¢½µµÍ³ö´íµÄ¿ÉÄÜÐÔ
* Ҫʹ×÷ÓÃÓò×îС£¬×îÓÐÁ¦µÄ·½·¨¾ÍÊÇÔÚµÚÒ»´ÎʹÓÃËüµÄʱºòÉùÃ÷£»Èç¹ûÌáǰÉùÃ÷»áÔì³É
* һƬ»ìÂÒ£»Ò²»á·ÖÉ¢×¢ÒâÁ¦
* ¼¸ºõÿ¸ö¾Ö²¿±äÁ¿µÄÉùÃ÷¶¼Ó¦¸Ã°üÀ¨Ò»¸ö³õʼ»¯µÃ±í´ïʽ£»
* ÀýÈ磺
* for(Element e : c)
* {
* dosomthing(e);
* }
* Õâ¸öÊÇjava1.5ÒÔÉϵİ汾µÄforÑ»·µÄÊ×ÏÈ¿¼ÂǵÄд·¨£»
* ¡£¡£¡£¡£¡£¡£¡£¡£¡£¡£¡£¡£¡£
* ÔÙÀ´¿´£ºÏÂÃæÊÇjava1.5ÒÔǰµÄforÑ»·
* List c = new ArrayList ();
Iterator it = c.iterator();
while(it.hasNext())
{
it.next();
}
List c1 = new ArrayList();
Iterator it1 = c1.iterator();
while(it.hasNext())
{
it1.next();
}
* µ«Äã±È½ÏÒ»ÏÂÕâÁ½¸öÑ»·£¬µÚ¶þ¸öÑ»·ÊÇÎÒÒªµÄµÚ¶þ¸öÑ»· ÎÒΪÁË·½±ã½«µÚÒ»¸öÑ»·
* ¸´ÖÆÁËÒ»·Ý £¬È»ºó¸Ä±äÁ˱äÁ¿µÄÃû³ÆÀ´´ïµ½Á½¸öÑ»·µÄÄ¿µÄ£¬這樣寫 ide²»會報錯
* µ«ÊÇÏÔÈ»ÎÒÍüÁËÐÞ¸ÄһЩ±ØÐëÐ޸ĵĶ«Î÷£¬µ«ÊǵÚÒ»¸öÑ»·ÖеÄitÔÚµÚ¶þ¸öµÄ×÷ÓÃÓòÖÐÒÀÈ»ÓÐЧ ÕâÑù»áÔì³ÉÄãÈÏΪ
* ĪÃûÆäÃîµÄÎÊÌ⣻
* Èç¹û這樣寫£º
* List c = new ArrayList ();
for (Iterator it = c.iterator();it.hasNext();)
{
it.next();
}
List c1 = new ArrayList();
while(Iterator it1 = c1.iterator();it.hasNext();)
{
it1.next();
}
µÚÒ»個Ñ環ÖеÄ變Á¿µÄ×÷ÓÃÓò²»會Ó°響µ½µÚ¶þ個 這樣ide¾Í會報錯 ¿ÉÒÔ¼°時¸Ä³É£»
將¾Ö²¿變Á¿µÄ×÷ÓÃÓò×îС»¯ ʹ·½·¨Ð¡¶ø¼¯ÖУ¬將ÄÜ·Ö開µÄ·½·¨¶¼·Ö開£»
* @author lee
*
*/
public class Chape45 {
public static void main(String[] args) {
/*List c = new ArrayList ();
Iterator it = c.iterator();
while(it.hasNext())
{
it.next();
}
List c1 = new ArrayList();
Iterator it1 = c1.iterator();
while(it.hasNext())
{
it1
Ïà¹ØÎĵµ£º
ѧϰjavaµÄ30¸öÄ¿±ê----Èç¹ûÕâ30ÌõÄã×öµÄ²î²»¶àÁË£¬jAVAˮƽ¾Íµ±È»²»ÓÃ˵ÁË£¬ºÃºÃŬÁ¦°É
1.ÄãÐèÒª¾«Í¨ÃæÏò¶ÔÏó·ÖÎöÓëÉè¼Æ(OOA/OOD)¡¢É漰ģʽ(GOF£¬J2EEDP)ÒÔ¼°×ÛºÏģʽ¡£ÄãÓ¦¸ÃÊ®·ÖÁ˽âUML£¬ÓÈÆäÊÇclass£¬object£¬interactionÒÔ¼°statediagrams¡£
¡¡¡¡2.ÄãÐèҪѧϰJAVAÓïÑԵĻù´¡ÖªÊ¶ÒÔ¼°ËüµÄºË ......
Ê×ÏÈÈ·¶¨ÓõÄServlet / JSPµÄ°æ±¾¡£
²é¿´web.xmlµÄ¿ªÍ·²¿·Ö£¬Èç¹ûÓÐÒÔÏÂÄÚÈÝ£¬±íʾÊÇServlet 2.4 / JSP 2.0¡£
<web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.s ......
ArrayList ºÍVectorÊDzÉÓÃÊý×鷽ʽ´æ´¢Êý¾Ý£¬´ËÊý×éÔªËØÊý´óÓÚʵ¼Ê´æ´¢µÄÊý¾ÝÒÔ±ãÔö¼ÓºÍ²åÈëÔªËØ£¬¶¼ÔÊÐíÖ±½ÓÐòºÅË÷ÒýÔªËØ£¬µ«ÊDzåÈëÊý¾ÝÒªÉè¼Æµ½Êý×éÔªËØÒÆ¶¯µÈÄÚ´æ²Ù×÷£¬ËùÒÔË÷ÒýÊý¾Ý¿ì²åÈëÊý¾ÝÂý£¬VectorÓÉÓÚʹÓÃÁËsynchronized·½·¨£¨Ḭ̈߳²È«£©ËùÒÔÐÔÄÜÉϱÈArrayListÒª²î£¬LinkedListʹÓÃË«ÏòÁ´±íʵÏÖ´æ´¢£¬°´Ðòº ......
×ܽáÒ»£º
Java IOµÄÒ»°ãʹÓÃÔÔò£º
Ò»¡¢°´Êý¾ÝÀ´Ô´£¨È¥Ïò£©·ÖÀࣺ
1¡¢ÊÇÎļþ£º FileInputStream, FileOutputStream, FileReader, FileWriter
2¡¢ÊÇbyte[]£ºByteArrayInputStream, ByteArrayOutputStream
3¡¢ÊÇChar[]: CharArrayReader, CharArrayWriter
4¡¢ÊÇString: StringBufferInputStream, StringReader, StringW ......
public List createArrayList(String FilePath,String FileName){
List list =new ArrayList();
FileName=FilePath+"\\"+FileName;
File file=new File(FileName);
String encoding="GBK";//·ÀÖ¹ÂÒÂë Õâ±àÂëÐèÒª¸ù¾Ý×Ô¼ºµÄ²Ù ......