makefile Ö® java X Ö® lint
E:\>javac -X
-Xlint ÆôÓý¨ÒéµÄ¾¯¸æ
-Xlint:{all,deprecation,unchecked,fallthrough,path,serial,finally,-deprecat ion
,-unchecked,-fallthrough,-path,-serial,-finally}ÆôÓûò½ûÓÃÌض¨µÄ¾¯¸æ
-Xbootclasspath/p:<·¾¶> ÖÃÓÚÒýµ¼Àà·¾¶Ö®Ç°
-Xbootclasspath/a:<·¾¶> ÖÃÓÚÒýµ¼Àà·¾¶Ö®ºó
-Xbootclasspath:<·¾¶> ¸²¸ÇÒýµ¼ÀàÎļþµÄλÖÃ
-Djava.ext.dirs=<Ŀ¼> ¸²¸Ç°²×°µÄÀ©Õ¹Ä¿Â¼µÄλÖÃ
-Djava.endorsed.dirs=<Ŀ¼> ¸²¸ÇÇ©ÃûµÄ±ê׼·¾¶µÄλÖÃ
-Xmaxerrs <±àºÅ> ÉèÖÃÒªÊä³öµÄ´íÎóµÄ×î´óÊýÄ¿
-Xmaxwarns <±àºÅ> ÉèÖÃÒªÊä³öµÄ¾¯¸æµÄ×î´óÊýÄ¿
-Xstdout <ÎļþÃû> Öض¨Ïò±ê×¼Êä³ö
ÕâЩѡÏÊǷDZê׼ѡÏעÒâ¸üС£¡£¡£
ÎÒÃÇÒÀ´ÎÀ´¿´¿´ÆäÖÐÉæ¼° lint µÄÑ¡Ï
-Xlint
ÆôÓÃËùÓо¯¸æ¡£¸ÃÑ¡ÏîÏ൱ÓÚ -Xlint:all Ñ¡Ïî¡£Ïà·´£¬¹Ø±ÕËùÓо¯¸æµÄÑ¡ÏîΪ -Xlint:none¡£
-Xlint:unchecked
ÆôÓöÔËùνµÄδ¾¼ì²éµÄת»»£¨unchecked warning£©µÄ¾¯¸æ¡£Õâ¸ö¾¯¸æÉæ¼° JDK 5.0 ÖеÄÐÂÌØÐÔ——·¶ÐÍ£¨Generic
Type£©£¬Õâ¾ø¶ÔÊÇÁíÍâÒ»¸ö¹ÊÊÂÁË¡£ÓÐÐËȤµÄ»°£¬¿ÉÒÔÔÚ Internet ÉÏËÑË÷µ½ºÜ¶à¹ØÓÚ·¶Ð͵ÄÎÄÕ¡£
-Xlint:path
µ±·¢ÏÖ²»´æÔڵķ¾¶»òÕßĿ¼ʱ¸ø³ö¾¯¸æ£¬±ÈÈç±ê׼ѡÏîÖеÄÀà·¾¶£¨classpath£©£¬Ô´´úÂë·¾¶£¨sourcepath£©µÈµÈ¡£
-Xlint:serial
µ±ÔÚ¿ÉÐòÁл¯µÄÀàÖÐûÓз¢ÏÖ serialVersionUID µÄ¶¨Òåʱ£¬¸ø³ö¾¯¸æ¡£
Xlint:finally
µ±·¢ÏÖ finally ×Ó¾äÎÞ·¨Õý³£½áÊøµÄÇé¿öʱ¸ø³ö¾¯¸æ¡£±ÈÈçÏÂÃæÕâ¶Î´úÂ룺
try {
} catch (Exception e) {
} finally {
for (;;);
}
-Xlint:fallthrough
µ±ÔÚ switch Óï¾ä¿éÖз¢ÏÖ fall-through µÄÇéÐÎʱ¸ø³ö¾¯¸æ¡£ÕâÀïËù˵µÄ fall-through ÇéÐÎÖ¸µÄÊÇÔÚ
switchÓï¾ä
Ïà¹ØÎĵµ£º
Javaѧϰ´ÓÈëÃŵ½¾«Í¨
Ò»¡¢ JDK (Java Development Kit)
JDKÊÇÕû¸öJavaµÄºËÐÄ£¬°üÀ¨ÁËJavaÔËÐл·¾³£¨Java Runtime Envirnment£©£¬Ò»¶ÑJava¹¤¾ßºÍJava»ù´¡µÄÀà¿â(rt.jar)¡£²»ÂÛʲôJavaÓ¦Ó÷þÎñÆ÷ʵÖʶ¼ÊÇÄÚÖÃÁËij¸ö°æ±¾µÄJDK¡£Òò´ËÕÆÎÕJDKÊÇѧºÃJavaµÄµÚÒ»²½¡£×îÖ÷Á÷µÄJ ......
create PROCEDURE pagelist
@tablename nvarchar(50),
@fieldname nvarchar(50)='*',
@pagesize int output,--ÿҳÏÔʾ¼Ç¼ÌõÊý
@currentpage int output,--µÚ¼¸Ò³
@orderid nvarchar(50),--Ö÷¼üÅÅÐò
@sort int,--ÅÅÐò·½Ê½£¬1±íʾÉýÐò£¬0±íʾ½µÐòÅÅÁÐ
......
/**
* ±£ÁôÁ½Î»Ð¡Êý
* @param d
* @return
*/
private static double remainTwoNumbers(double d){
java.math.BigDecimal f1 = new java.math.BigDecimal(d);//СÊýµãºó±£Áô2Î ......
ÎÄÖÐÒýÓÃÁËËïÀÏʦµÄ´úÂ룬²¢×¢Ã÷¡£
import java.io.*;
import java.net.*;
public class EchoServer {
private int port=8888;
private ServerSocket serverSocket;
public EchoServer() throws IOException {
serverSocket = new ServerSocket(port);
System.out.println("·þÎñÆ÷Æô¶¯");
......
ÏÂÃ濪½²¹ÊÊ£º
´ÓÇ°Óиö·¿¼ä£¬·¿¼äÀïÓзÝÎĵµ£¬·¿¼ä»¹ÓÐÒ»°ÑÔ¿³×¡£ Õâ°ÑÔ¿³×ÔÚÕÅÈýÊÖÀï¡£
ÕâʱÀîËÄÀ´ÏòÕÅÈýÒªÄÇ·ÝÎĵµ¡£ ÕÅÈý²»Ì«Ï²»¶ÀîËÄ£¬µ«ÓÖŵ¢ÎóÁË
¹¤×÷²»ºÃ½»´ú¡£ÓÚÊÇÕÅÈý¾Í°Ñ·¿¼äÀïÎĵµµÄÎĵµ¸´Ó¡ÁËÒ»·Ý£¬È»ºó°ÑÄǸö¸´Ó¡¼þ½»¸øÁËÀîËÄ£¨Õâ½Ð´«Öµ£©¡£
ÀîËÄÄõ½Îĵµºó£¨¸´Ó¡¼þ£©£¬ºúÂÒÐÞ¸ÄÒ» ......