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]]>- Tapestry+Ibatis+Spring 鍐欑殑Digg緗戠珯銆傛晥鏋滀笉閿欙紒http://www.tkk7.com/airdream/archive/2006/11/14/81100.htmlAIRDREAMAIRDREAMTue, 14 Nov 2006 04:53:00 GMThttp://www.tkk7.com/airdream/archive/2006/11/14/81100.htmlhttp://www.tkk7.com/airdream/comments/81100.htmlhttp://www.tkk7.com/airdream/archive/2006/11/14/81100.html#Feedback1http://www.tkk7.com/airdream/comments/commentRss/81100.htmlhttp://www.tkk7.com/airdream/services/trackbacks/81100.html绔欏悕錛氶叿瀹?br />鍦板潃錛?a >http://qopo.net

]]> - spring+velocity鑷姩鍙戦侀偖浠?http://www.tkk7.com/airdream/archive/2006/07/12/57760.htmlAIRDREAMAIRDREAMWed, 12 Jul 2006 02:58:00 GMThttp://www.tkk7.com/airdream/archive/2006/07/12/57760.htmlhttp://www.tkk7.com/airdream/comments/57760.htmlhttp://www.tkk7.com/airdream/archive/2006/07/12/57760.html#Feedback0http://www.tkk7.com/airdream/comments/commentRss/57760.htmlhttp://www.tkk7.com/airdream/services/trackbacks/57760.html
spring+velocity鑷姩鍙戦侀偖浠?/b>
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1.涓嬭澆spring鍙妚elocity綾誨簱錛?br /> email閰嶇疆鏂囦歡錛歮ail.properties錛?br />mail.default.from=jfishsz@163.com mail.host=smtp.163.com mail.username=xxxxxx mail.password=xxxxxx mail.smtp.auth=true mail.smtp.timeout=25000
spring閰嶇疆鏂囦歡錛歛pplicationContext.xml <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" 聽 "http://www.springframework.org/dtd/spring-beans.dtd">
<beans> 聽 聽 <!-- For mail settings and future properties files --> 聽 聽 <bean id="propertyConfigurer" 聽 聽 聽 聽 class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> 聽 聽 聽 聽 <property name="locations"> 聽 聽 聽 聽 聽 聽 聽 <list> 聽 聽 聽 聽 聽 聽 聽 聽 聽 <value>classpath:mail.properties</value> 聽 聽 聽 聽 聽 聽 聽 </list> 聽 聽 聽 聽 </property> 聽 聽 </bean> 聽 聽 <bean id="mailSender" 聽 聽 聽 聽 class="org.springframework.mail.javamail.JavaMailSenderImpl"> 聽 聽 聽 聽 <property name="host"> 聽 聽 聽 聽 聽 聽 聽 <value>${mail.host}</value> 聽 聽 聽 聽 </property> 聽 聽 聽 聽 <property name="username"> 聽 聽 聽 聽 聽 聽 聽 <value>${mail.username}</value> 聽 聽 聽 聽 </property> 聽 聽 聽 聽 <property name="password"> 聽 聽 聽 聽 聽 聽 聽 <value>${mail.password}</value> 聽 聽 聽 聽 </property> 聽 聽 聽 聽 <property name="javaMailProperties"> 聽 聽 聽 聽 聽 聽 聽 <props> 聽 聽 聽 聽 聽 聽 聽 聽 聽 <prop key="mail.smtp.auth">${mail.smtp.auth}</prop> 聽 聽 聽 聽 聽 聽 聽 聽 聽 <prop key="mail.smtp.timeout"> 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 ${mail.smtp.timeout} 聽 聽 聽 聽 聽 聽 聽 聽 聽 </prop> 聽 聽 聽 聽 聽 聽 聽 </props> 聽 聽 聽 聽 </property> 聽 聽 </bean> 聽 聽 <bean id="mailMessage" 聽 聽 聽 聽 class="org.springframework.mail.SimpleMailMessage" 聽 聽 聽 聽 singleton="false"> 聽 聽 聽 聽 <property name="from"> 聽 聽 聽 聽 聽 聽 聽 <value>${mail.default.from}</value> 聽 聽 聽 聽 </property> 聽 聽 聽 聽 聽 聽 </bean> 聽 聽 <bean id="sendMail" class="net.pms.email.SendMail"> 聽 聽 聽 聽 <property name="mailSender" ref="mailSender" /> 聽 聽 聽 聽 <property name="message" ref="mailMessage" /> 聽 聽 聽 聽 <property name="velocityEngine" ref="velocityEngine" /> 聽 聽 </bean> 聽 聽 <!-- Configure Velocity for sending e-mail --> 聽 聽 <bean id="velocityEngine" 聽 聽 聽 聽 class="org.springframework.ui.velocity.VelocityEngineFactoryBean"> 聽 聽 聽 聽 <property name="velocityProperties"> 聽 聽 聽 聽 聽 聽 聽 <props> 聽 聽 聽 聽 聽 聽 聽 聽 聽 <prop key="resource.loader">class</prop> 聽 聽 聽 聽 聽 聽 聽 聽 聽 <prop key="class.resource.loader.class"> 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader 聽 聽 聽 聽 聽 聽 聽 聽 聽 </prop> 聽 聽 聽 聽 聽 聽 聽 聽 聽 <prop key="velocimacro.library"></prop> 聽 聽 聽 聽 聽 聽 聽 </props> 聽 聽 聽 聽 </property> 聽 聽 </bean> </beans> velocity妯℃澘鏂囦歡錛歛ccountCreated.vm錛?br />${message}
Username: ${username} Password: ${Password}
Login at: ${applicationURL}
2.瀹炵幇綾?br />SendMail.java package net.pms.email;
import java.util.Map;
import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.velocity.app.VelocityEngine; import org.apache.velocity.exception.VelocityException; import org.springframework.mail.MailSender; import org.springframework.mail.SimpleMailMessage; import org.springframework.ui.velocity.VelocityEngineUtils;
public class SendMail { 聽 聽 protected static final Log log = LogFactory.getLog(SendMail.class);
聽 聽 private MailSender mailSender;
聽 聽 private SimpleMailMessage message;
聽 聽 private VelocityEngine velocityEngine;
聽 聽 public void setVelocityEngine(VelocityEngine velocityEngine) { 聽 聽 聽 聽 this.velocityEngine = velocityEngine; 聽 聽 }
聽 聽 public void setMailSender(MailSender mailSender) { 聽 聽 聽 聽 this.mailSender = mailSender; 聽 聽 }
聽 聽 public void setMessage(SimpleMailMessage message) { 聽 聽 聽 聽 this.message = message; 聽 聽 }
聽 聽 public void sendEmail(Map model) { 聽 聽 聽 聽 message.setTo("jfishsz@163.com"); 聽 聽 聽 聽 message.setSubject("subject"); 聽 聽 聽 聽 String result = null; 聽 聽 聽 聽 try { 聽 聽 聽 聽 聽 聽 聽 result = VelocityEngineUtils.mergeTemplateIntoString( 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 velocityEngine, "accountCreated.vm", model); 聽 聽 聽 聽 } catch (VelocityException e) { 聽 聽 聽 聽 聽 聽 聽 e.printStackTrace(); 聽 聽 聽 聽 } 聽 聽 聽 聽 message.setText(result); 聽 聽 聽 聽 mailSender.send(message); 聽 聽 } } 嫻嬭瘯綾伙細SendMailTest.java package net.pms.email;
import java.util.HashMap; import java.util.Map;
import junit.framework.TestCase;
import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext;
public class SendMailTest extends TestCase { 聽 聽 String[] paths = { "config/applicationContext*.xml" };
聽 聽 ApplicationContext ctx = new ClassPathXmlApplicationContext(paths);
聽 聽 SendMail s = (SendMail) ctx.getBean("sendMail");
聽 聽 protected void setUp() throws Exception { 聽 聽 聽 聽 super.setUp(); 聽 聽 }
聽 聽 protected void tearDown() throws Exception { 聽 聽 聽 聽 super.tearDown(); 聽 聽 }
聽 聽 /* 聽 聽 * Test method for 'net.pms.email.SendMail.sendEmail(Map)' 聽 聽 */ 聽 聽 public void testSendEmail() { 聽 聽 聽 聽 Map model = new HashMap(); 聽 聽 聽 聽 model.put("message", "msg"); 聽 聽 聽 聽 model.put("username", "jack"); 聽 聽 聽 聽 model.put("Password", "666666"); 聽 聽 聽 聽 model.put("applicationURL", "www.163.com"); 聽 聽 聽 聽 s.sendEmail(model); 聽 聽 }
} 榪欏彧鏄竴涓畝鍗曠殑瀹炵幇浠嬬粛錛屾垜鎯抽氳繃榪欎釜渚嬪瓙榪涘叆閫氬線javamail鐨勫ぇ闂ㄣ?br />
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鍘熸枃錛?a >http://jfish.blog.ccidnet.com/blog/ccid/do_showone/tid_18513.html
]]> - java闈㈣瘯棰橀泦閿?鍥涜緫http://www.tkk7.com/airdream/archive/2006/01/05/26810.htmlAIRDREAMAIRDREAMThu, 05 Jan 2006 15:40:00 GMThttp://www.tkk7.com/airdream/archive/2006/01/05/26810.htmlhttp://www.tkk7.com/airdream/comments/26810.htmlhttp://www.tkk7.com/airdream/archive/2006/01/05/26810.html#Feedback0http://www.tkk7.com/airdream/comments/commentRss/26810.htmlhttp://www.tkk7.com/airdream/services/trackbacks/26810.html
JAVA SERVLET API涓璮orward() 涓巗endRedirect()鐨勫尯鍒紵
forward()鏂規硶鍙互浣跨敤鍘熸潵鐨勫璞★紝鑰屼笖閫熷害杈冨揩銆傚湴鍧鏍忎笉鍙樺寲銆傚彧鑳藉湪鏈満鍐呯殑欏甸潰闂磋煩杞?br>
redirect()鏂規硶涓嶅彲浠ヤ嬌鐢ㄥ師鏉ョ殑瀵硅薄錛岃屼笖閫熷害杈冩參銆傚湴鍧鏍忓彉鍖栥傚彲浠ヨ煩杞埌浠諱綍欏甸潰鍜屾満鍣ㄣ?br>
:鍓嶈呬粎鏄鍣ㄤ腑鎺у埗鏉冪殑杞悜錛屽湪瀹㈡埛绔祻瑙堝櫒鍦板潃鏍忎腑涓嶄細鏄劇ず鍑鴻漿鍚戝悗鐨勫湴鍧錛涘悗鑰呭垯鏄畬鍏ㄧ殑璺寵漿錛屾祻瑙堝櫒灝嗕細寰楀埌璺寵漿鐨勫湴鍧錛屽茍閲嶆柊鍙戦佽姹傞摼鎺ャ傝繖鏍鳳紝浠庢祻瑙堝櫒鐨勫湴鍧鏍忎腑鍙互鐪嬪埌璺寵漿鍚庣殑閾炬帴鍦板潃銆傛墍浠ワ紝鍓嶈呮洿鍔犻珮鏁堬紝鍦ㄥ墠鑰呭彲浠ユ弧瓚抽渶瑕佹椂錛屽敖閲忎嬌鐢╢orward()鏂規硶錛屽茍涓旓紝榪欐牱涔熸湁鍔╀簬闅愯棌瀹為檯鐨勯摼鎺ャ傚湪鏈変簺鎯呭喌涓嬶紝姣斿錛岄渶瑕佽煩杞埌涓涓叾瀹冩湇鍔″櫒涓婄殑璧勬簮錛屽垯蹇呴』浣跨敤sendRedirect()鏂規硶銆?
STRUTS鐨勫簲鐢?濡係TRUTS鏋舵瀯)
Struts妗嗘灦鐨勫鐞嗘祦紼嬫竻妤氱殑浣撶幇浜哅VC緋葷粺鐨勭壒鐐癸紝 Struts Controller ActionServlet澶勭悊瀹㈡埛璇鋒眰錛屽埄鐢ㄩ厤緗殑ActionMapping瀵硅薄鎶婅姹傛槧灝勫埌Action澶勭悊鍣ㄥ璞¤繘琛屽鐞嗐侫ction澶勭悊瀵硅薄璁塊棶ActionForm涓殑鏁版嵁錛屽鐞嗗拰鍝嶅簲瀹㈡埛璇鋒眰錛屽畠榪樿皟鐢ㄥ悗鍙扮殑Bean緇勪歡錛岃繖浜涚粍浠跺皝瑁呬簡鍏蜂綋鐨勪笟鍔¢昏緫銆侫ction澶勭悊鍣ㄥ璞℃牴鎹鐞嗙粨鏋滈氱煡Controller錛孋ontroller榪涜涓嬩竴姝ョ殑澶勭悊銆?br>
Struts鏄噰鐢↗ava Servlet/JavaServer Pages鎶鏈紝寮鍙慦eb搴旂敤紼嬪簭鐨勫紑鏀炬簮鐮佺殑framework銆?閲囩敤Struts鑳藉紑鍙戝嚭鍩轟簬MVC(Model-View-Controller)璁捐妯″紡鐨勫簲鐢ㄦ瀯鏋躲?Struts鏈夊涓嬬殑涓昏鍔熻兘錛?
涓.鍖呭惈涓涓猚ontroller servlet錛岃兘灝嗙敤鎴風殑璇鋒眰鍙戦佸埌鐩稿簲鐨凙ction瀵硅薄銆?
浜?JSP鑷敱tag搴擄紝騫朵笖鍦╟ontroller servlet涓彁渚涘叧鑱旀敮鎸侊紝甯姪寮鍙戝憳鍒涘緩浜や簰寮忚〃鍗曞簲鐢ㄣ?
涓?鎻愪緵浜嗕竴緋誨垪瀹炵敤瀵硅薄錛歑ML澶勭悊銆侀氳繃Java reflection APIs鑷姩澶勭悊JavaBeans灞炴с佸浗闄呭寲鐨勬彁紺哄拰娑堟伅銆?br>
MVC鐨勫悇涓儴鍒嗛兘鏈夐偅浜涙妧鏈潵瀹炵幇?濡備綍瀹炵幇?
絳?MVC鏄疢odel錛峍iew錛岰ontroller鐨勭畝鍐欍?Model" 浠h〃鐨勬槸搴旂敤鐨勪笟鍔¢昏緫錛堥氳繃JavaBean錛孍JB緇勪歡瀹炵幇錛夛紝 "View" 鏄簲鐢ㄧ殑琛ㄧず闈紙鐢盝SP欏甸潰浜х敓錛夛紝"Controller" 鏄彁渚涘簲鐢ㄧ殑澶勭悊榪囩▼鎺у埗錛堜竴鑸槸涓涓猄ervlet錛夛紝閫氳繃榪欑璁捐妯″瀷鎶婂簲鐢ㄩ昏緫錛屽鐞嗚繃紼嬪拰鏄劇ず閫昏緫鍒嗘垚涓嶅悓鐨勭粍浠跺疄鐜般傝繖浜涚粍浠跺彲浠ヨ繘琛屼氦浜掑拰閲嶇敤銆?
涓涓綉欏墊湁浠ヤ笅html浠g爜鐗囨柇
- java闈㈣瘯棰橀泦閿?涓夎緫 http://www.tkk7.com/airdream/archive/2006/01/05/26809.htmlAIRDREAMAIRDREAMThu, 05 Jan 2006 15:36:00 GMThttp://www.tkk7.com/airdream/archive/2006/01/05/26809.htmlhttp://www.tkk7.com/airdream/comments/26809.htmlhttp://www.tkk7.com/airdream/archive/2006/01/05/26809.html#Feedback0http://www.tkk7.com/airdream/comments/commentRss/26809.htmlhttp://www.tkk7.com/airdream/services/trackbacks/26809.html
絎竴錛岃皥璋坒inal, finally, finalize鐨勫尯鍒?br>
final?淇グ絎︼紙鍏抽敭瀛楋級濡傛灉涓涓被琚0鏄庝負final錛屾剰鍛崇潃瀹冧笉鑳藉啀媧劇敓鍑烘柊鐨勫瓙綾伙紝涓嶈兘浣滀負鐖剁被琚戶鎵褲傚洜姝や竴涓被涓嶈兘鏃㈣澹版槑涓?abstract鐨勶紝鍙堣澹版槑涓篺inal鐨勩傚皢鍙橀噺鎴栨柟娉曞0鏄庝負final錛屽彲浠ヤ繚璇佸畠浠湪浣跨敤涓笉琚敼鍙樸傝澹版槑涓篺inal鐨勫彉閲忓繀欏誨湪澹版槑鏃剁粰瀹氬垵鍊鹼紝鑰屽湪浠ュ悗鐨勫紩鐢ㄤ腑鍙兘璇誨彇錛屼笉鍙慨鏀廣傝澹版槑涓篺inal鐨勬柟娉曚篃鍚屾牱鍙兘浣跨敤錛屼笉鑳介噸杞?
finally?鍐嶅紓甯稿鐞嗘椂鎻愪緵 finally 鍧楁潵鎵ц浠諱綍娓呴櫎鎿嶄綔銆傚鏋滄姏鍑轟竴涓紓甯革紝閭d箞鐩稿尮閰嶇殑 catch 瀛愬彞灝變細鎵ц錛岀劧鍚庢帶鍒跺氨浼氳繘鍏?finally 鍧楋紙濡傛灉鏈夌殑璇濓級銆?
finalize?鏂規硶鍚嶃侸ava 鎶鏈厑璁鎬嬌鐢?finalize() 鏂規硶鍦ㄥ瀮鍦炬敹闆嗗櫒灝嗗璞′粠鍐呭瓨涓竻闄ゅ嚭鍘諱箣鍓嶅仛蹇呰鐨勬竻鐞嗗伐浣溿傝繖涓柟娉曟槸鐢卞瀮鍦炬敹闆嗗櫒鍦ㄧ‘瀹氳繖涓璞℃病鏈夎寮曠敤鏃跺榪欎釜瀵硅薄璋冪敤鐨勩傚畠鏄湪 Object 綾諱腑瀹氫箟鐨勶紝鍥犳鎵鏈夌殑綾婚兘緇ф壙浜嗗畠銆傚瓙綾昏鐩?finalize() 鏂規硶浠ユ暣鐞嗙郴緇熻祫婧愭垨鑰呮墽琛屽叾浠栨竻鐞嗗伐浣溿俧inalize() 鏂規硶鏄湪鍨冨溇鏀墮泦鍣ㄥ垹闄ゅ璞′箣鍓嶅榪欎釜瀵硅薄璋冪敤鐨勩?br>
絎簩錛孉nonymous Inner Class (鍖垮悕鍐呴儴綾? 鏄惁鍙互extends(緇ф壙)鍏跺畠綾伙紝鏄惁鍙互implements(瀹炵幇)interface(鎺ュ彛)?
鍖垮悕鐨勫唴閮ㄧ被鏄病鏈夊悕瀛楃殑鍐呴儴綾匯備笉鑳絜xtends(緇ф壙) 鍏跺畠綾伙紝浣嗕竴涓唴閮ㄧ被鍙互浣滀負涓涓帴鍙o紝鐢卞彟涓涓唴閮ㄧ被瀹炵幇銆?br>
絎笁錛孲tatic Nested Class 鍜?Inner Class鐨勪笉鍚岋紝璇村緱瓚婂瓚婂ソ(闈㈣瘯棰樻湁鐨勫緢絎肩粺)銆?br>
Nested Class 錛堜竴鑸槸C++鐨勮娉曪級錛孖nner Class (涓鑸槸JAVA鐨勮娉?銆侸ava鍐呴儴綾諱笌C++宓屽綾繪渶澶х殑涓嶅悓灝卞湪浜庢槸鍚︽湁鎸囧悜澶栭儴鐨勫紩鐢ㄤ笂銆傚叿浣撳彲瑙乭ttp: //www.frontfree.net/articles/services/view.asp?id=704&page=1
娉細 闈欐佸唴閮ㄧ被錛圛nner Class錛夋剰鍛崇潃1鍒涘緩涓涓猻tatic鍐呴儴綾葷殑瀵硅薄錛屼笉闇瑕佷竴涓閮ㄧ被瀵硅薄錛?涓嶈兘浠庝竴涓猻tatic鍐呴儴綾葷殑涓涓璞¤闂竴涓閮ㄧ被瀵硅薄
絎洓錛?鍜?&鐨勫尯鍒?br>
&鏄綅榪愮畻絎︺?&鏄竷灝旈昏緫榪愮畻絎︺?br>
絎簲錛孒ashMap鍜孒ashtable鐨勫尯鍒?br>
閮藉睘浜嶮ap鎺ュ彛鐨勭被錛屽疄鐜頒簡灝嗘儫涓閿槧灝勫埌鐗瑰畾鐨勫間笂銆?br>
HashMap 綾繪病鏈夊垎綾繪垨鑰呮帓搴忋傚畠鍏佽涓涓?null 閿拰澶氫釜 null 鍊箋?
Hashtable 綾諱技浜?HashMap錛屼絾鏄笉鍏佽 null 閿拰 null 鍊箋傚畠涔熸瘮 HashMap 鎱紝鍥犱負瀹冩槸鍚屾鐨勩?br>
絎叚錛孋ollection 鍜?Collections鐨勫尯鍒?br>
Collections鏄釜java.util涓嬬殑綾伙紝瀹冨寘鍚湁鍚勭鏈夊叧闆嗗悎鎿嶄綔鐨勯潤鎬佹柟娉曘?br>
Collection鏄釜java.util涓嬬殑鎺ュ彛錛屽畠鏄悇縐嶉泦鍚堢粨鏋勭殑鐖舵帴鍙c?br>
絎竷錛屼粈涔堟椂鍊欑敤assert銆?br>
鏂█鏄竴涓寘鍚竷灝旇〃杈懼紡鐨勮鍙ワ紝鍦ㄦ墽琛岃繖涓鍙ユ椂鍋囧畾璇ヨ〃杈懼紡涓?true銆傚鏋滆〃杈懼紡璁$畻涓?false錛岄偅涔堢郴緇熶細鎶ュ憡涓涓?AssertionError銆傚畠鐢ㄤ簬璋冭瘯鐩殑錛?
assert(a > 0); // throws an AssertionError if a <= 0
鏂█鍙互鏈変袱縐嶅艦寮忥細
assert Expression1 ;
assert Expression1 : Expression2 ;
Expression1 搴旇鎬繪槸浜х敓涓涓竷灝斿箋?
Expression2 鍙互鏄緱鍑轟竴涓肩殑浠繪剰琛ㄨ揪寮忋傝繖涓肩敤浜庣敓鎴愭樉紺烘洿澶氳皟璇曚俊鎭殑 String 娑堟伅銆?br>
鏂█鍦ㄩ粯璁ゆ儏鍐典笅鏄鐢ㄧ殑銆傝鍦ㄧ紪璇戞椂鍚敤鏂█錛岄渶瑕佷嬌鐢?source 1.4 鏍囪錛?
javac -source 1.4 Test.java
瑕佸湪榪愯鏃跺惎鐢ㄦ柇璦錛屽彲浣跨敤 -enableassertions 鎴栬?-ea 鏍囪銆?
瑕佸湪榪愯鏃墮夋嫨紱佺敤鏂█錛屽彲浣跨敤 -da 鎴栬?-disableassertions 鏍囪銆?
瑕佺郴緇熺被涓惎鐢ㄦ柇璦錛屽彲浣跨敤 -esa 鎴栬?-dsa 鏍囪銆傝繕鍙互鍦ㄥ寘鐨勫熀紜涓婂惎鐢ㄦ垨鑰呯鐢ㄦ柇璦銆?
鍙互鍦ㄩ璁℃甯告儏鍐典笅涓嶄細鍒拌揪鐨勪換浣曚綅緗笂鏀劇疆鏂█銆傛柇璦鍙互鐢ㄤ簬楠岃瘉浼犻掔粰縐佹湁鏂規硶鐨勫弬鏁般備笉榪囷紝鏂█涓嶅簲璇ョ敤浜庨獙璇佷紶閫掔粰鍏湁鏂規硶鐨勫弬鏁幫紝鍥犱負涓嶇鏄惁鍚敤浜嗘柇璦錛屽叕鏈夋柟娉曢兘蹇呴』媯鏌ュ叾鍙傛暟銆備笉榪囷紝鏃㈠彲浠ュ湪鍏湁鏂規硶涓紝涔熷彲浠ュ湪闈炲叕鏈夋柟娉曚腑鍒╃敤鏂█嫻嬭瘯鍚庣疆鏉′歡銆傚彟澶栵紝鏂█涓嶅簲璇ヤ互浠諱綍鏂瑰紡鏀瑰彉紼嬪簭鐨勭姸鎬併?
絎叓錛孏C鏄粈涔? 涓轟粈涔堣鏈塆C? (鍩虹)銆?br>
GC鏄瀮鍦炬敹闆嗗櫒銆侸ava 紼嬪簭鍛樹笉鐢ㄦ媴蹇冨唴瀛樼鐞嗭紝鍥犱負鍨冨溇鏀墮泦鍣ㄤ細鑷姩榪涜綆$悊銆傝璇鋒眰鍨冨溇鏀墮泦錛屽彲浠ヨ皟鐢ㄤ笅闈㈢殑鏂規硶涔嬩竴錛?
System.gc()
Runtime.getRuntime().gc()
絎節錛孲tring s = new String("xyz");鍒涘緩浜嗗嚑涓猄tring Object?
涓や釜瀵硅薄錛屼竴涓槸鈥渪yx鈥?涓涓槸鎸囧悜鈥渪yx鈥濈殑寮曠敤瀵硅薄s銆?br>
絎崄錛孧ath.round(11.5)絳夋柤澶氬皯? Math.round(-11.5)絳夋柤澶氬皯?
Math.round(11.5)榪斿洖錛坙ong錛?2錛孧ath.round(-11.5)榪斿洖錛坙ong錛?11;
絎崄涓錛宻hort s1 = 1; s1 = s1 + 1;鏈変粈涔堥敊? short s1 = 1; s1 += 1;鏈変粈涔堥敊?
short s1 = 1; s1 = s1 + 1;鏈夐敊錛宻1鏄痵hort鍨嬶紝s1+1鏄痠nt鍨?涓嶈兘鏄懼紡杞寲涓簊hort鍨嬨傚彲淇敼涓簊1 =(short)(s1 + 1) 銆俿hort s1 = 1; s1 += 1姝g‘銆?br>
絎崄浜岋紝sleep() 鍜?wait() 鏈変粈涔堝尯鍒? 鎼炵嚎紼嬬殑鏈鐖?br>
sleep()鏂規硶鏄嬌綰跨▼鍋滄涓孌墊椂闂寸殑鏂規硶銆傚湪sleep 鏃墮棿闂撮殧鏈熸弧鍚庯紝綰跨▼涓嶄竴瀹氱珛鍗蟲仮澶嶆墽琛屻傝繖鏄洜涓哄湪閭d釜鏃跺埢錛屽叾瀹冪嚎紼嬪彲鑳芥鍦ㄨ繍琛岃屼笖娌℃湁琚皟搴︿負鏀懼純鎵ц錛岄櫎闈?br>
(a)鈥滈啋鏉モ濈殑綰跨▼鍏鋒湁鏇撮珮鐨勪紭鍏堢駭
(b)姝e湪榪愯鐨勭嚎紼嬪洜涓哄叾瀹冨師鍥犺岄樆濉炪?br>
wait()鏄嚎紼嬩氦浜掓椂錛屽鏋滅嚎紼嬪涓涓悓姝ュ璞 鍙戝嚭涓涓獁ait()璋冪敤錛岃綰跨▼浼氭殏鍋滄墽琛岋紝琚皟瀵硅薄榪涘叆絳夊緟鐘舵侊紝鐩村埌琚敜閱掓垨絳夊緟鏃墮棿鍒般?br>
絎崄涓夛紝Java鏈夋病鏈塯oto?
Goto?java涓殑淇濈暀瀛楋紝鐜板湪娌℃湁鍦╦ava涓嬌鐢ㄣ?br>
絎崄鍥涳紝鏁扮粍鏈夋病鏈塴ength()榪欎釜鏂規硶? String鏈夋病鏈塴ength()榪欎釜鏂規硶錛?br>
鏁扮粍娌℃湁length()榪欎釜鏂規硶錛屾湁length鐨勫睘鎬с?br>
String鏈夋湁length()榪欎釜鏂規硶銆?br>
絎崄浜旓紝Overload鍜孫verride鐨勫尯鍒侽verloaded鐨勬柟娉曟槸鍚﹀彲浠ユ敼鍙樿繑鍥炲肩殑綾誨瀷?
鏂規硶鐨勯噸鍐橭verriding鍜岄噸杞絆verloading鏄疛ava澶氭佹х殑涓嶅悓琛ㄧ幇銆傞噸鍐橭verriding鏄埗綾諱笌瀛愮被涔嬮棿澶氭佹х殑涓縐嶈〃鐜幫紝閲嶈澆Overloading鏄竴涓被涓鎬佹х殑涓縐嶈〃鐜般傚鏋滃湪瀛愮被涓畾涔夋煇鏂規硶涓庡叾鐖剁被鏈夌浉鍚岀殑鍚嶇О鍜屽弬鏁幫紝鎴戜滑璇磋鏂規硶琚噸鍐?(Overriding)銆傚瓙綾葷殑瀵硅薄浣跨敤榪欎釜鏂規硶鏃訛紝灝嗚皟鐢ㄥ瓙綾諱腑鐨勫畾涔夛紝瀵瑰畠鑰岃█錛岀埗綾諱腑鐨勫畾涔夊鍚岃鈥滃睆钄解濅簡銆傚鏋滃湪涓涓被涓畾涔変簡澶氫釜鍚屽悕鐨勬柟娉曪紝瀹冧滑鎴栨湁涓嶅悓鐨勫弬鏁頒釜鏁版垨鏈変笉鍚岀殑鍙傛暟綾誨瀷錛屽垯縐頒負鏂規硶鐨勯噸杞?Overloading)銆侽verloaded鐨勬柟娉曟槸鍙互鏀瑰彉榪斿洖鍊肩殑綾誨瀷銆?br>
絎崄鍏紝Set閲岀殑鍏冪礌鏄笉鑳介噸澶嶇殑錛岄偅涔堢敤浠涔堟柟娉曟潵鍖哄垎閲嶅涓庡惁鍛? 鏄敤==榪樻槸equals()? 瀹冧滑鏈変綍鍖哄埆?
Set閲岀殑鍏冪礌鏄笉鑳介噸澶嶇殑錛岄偅涔堢敤iterator()鏂規硶鏉ュ尯鍒嗛噸澶嶄笌鍚︺俥quals()鏄垽璇諱袱涓猄et鏄惁鐩哥瓑銆?br>
equals()鍜?=鏂規硶鍐沖畾寮曠敤鍊兼槸鍚︽寚鍚戝悓涓瀵硅薄equals()鍦ㄧ被涓瑕嗙洊錛屼負鐨勬槸褰撲袱涓垎紱葷殑瀵硅薄鐨勫唴瀹瑰拰綾誨瀷鐩擱厤鐨勮瘽錛岃繑鍥炵湡鍊箋?br>
絎崄涓冿紝緇欐垜涓涓綘鏈甯歌鍒扮殑runtime exception銆?br>
ArithmeticException, ArrayStoreException, BufferOverflowException, BufferUnderflowException, CannotRedoException, CannotUndoException, ClassCastException, CMMException, ConcurrentModificationException, DOMException, EmptyStackException, IllegalArgumentException, IllegalMonitorStateException, IllegalPathStateException, IllegalStateException,
ImagingOpException, IndexOutOfBoundsException, MissingResourceException, NegativeArraySizeException, NoSuchElementException, NullPointerException, ProfileDataException, ProviderException, RasterFormatException, SecurityException, SystemException, UndeclaredThrowableException, UnmodifiableSetException, UnsupportedOperationException
絎崄鍏紝error鍜宔xception鏈変粈涔堝尯鍒?
error 琛ㄧず鎭㈠涓嶆槸涓嶅彲鑳戒絾寰堝洶闅劇殑鎯呭喌涓嬬殑涓縐嶄弗閲嶉棶棰樸傛瘮濡傝鍐呭瓨婧㈠嚭銆備笉鍙兘鎸囨湜紼嬪簭鑳藉鐞嗚繖鏍風殑鎯呭喌銆?br>
exception 琛ㄧず涓縐嶈璁℃垨瀹炵幇闂銆備篃灝辨槸璇達紝瀹冭〃紺哄鏋滅▼搴忚繍琛屾甯革紝浠庝笉浼氬彂鐢熺殑鎯呭喌銆?br>
絎崄涔濓紝List, Set, Map鏄惁緇ф壙鑷狢ollection鎺ュ彛?
List錛孲et鏄?br>
Map涓嶆槸
絎簩鍗侊紝abstract class鍜宨nterface鏈変粈涔堝尯鍒?
澹版槑鏂規硶鐨勫瓨鍦ㄨ屼笉鍘誨疄鐜板畠鐨勭被琚彨鍋氭娊璞$被錛坅bstract class錛夛紝瀹冪敤浜庤鍒涘緩涓涓綋鐜版煇浜涘熀鏈涓虹殑綾伙紝騫朵負璇ョ被澹版槑鏂規硶錛屼絾涓嶈兘鍦ㄨ綾諱腑瀹炵幇璇ョ被鐨勬儏鍐點備笉鑳藉垱寤篴bstract 綾葷殑瀹炰緥銆傜劧鑰屽彲浠ュ垱寤轟竴涓彉閲忥紝鍏剁被鍨嬫槸涓涓娊璞$被錛屽茍璁╁畠鎸囧悜鍏蜂綋瀛愮被鐨勪竴涓疄渚嬨備笉鑳芥湁鎶借薄鏋勯犲嚱鏁版垨鎶借薄闈欐佹柟娉曘侫bstract 綾葷殑瀛愮被涓哄畠浠埗綾諱腑鐨勬墍鏈夋娊璞℃柟娉曟彁渚涘疄鐜幫紝鍚﹀垯瀹冧滑涔熸槸鎶借薄綾諱負銆傚彇鑰屼唬涔嬶紝鍦ㄥ瓙綾諱腑瀹炵幇璇ユ柟娉曘傜煡閬撳叾琛屼負鐨勫叾瀹冪被鍙互鍦ㄧ被涓疄鐜拌繖浜涙柟娉曘?br>
鎺ュ彛錛坕nterface錛夋槸鎶借薄綾葷殑鍙樹綋銆傚湪鎺ュ彛涓紝鎵鏈夋柟娉曢兘鏄娊璞$殑銆傚緇ф壙鎬у彲閫氳繃瀹炵幇榪欐牱鐨勬帴鍙h岃幏寰椼傛帴鍙d腑鐨勬墍鏈夋柟娉曢兘鏄娊璞$殑錛屾病鏈変竴涓湁紼嬪簭浣撱傛帴鍙e彧鍙互瀹氫箟static final鎴愬憳鍙橀噺銆傛帴鍙g殑瀹炵幇涓庡瓙綾葷浉浼鹼紝闄や簡璇ュ疄鐜扮被涓嶈兘浠庢帴鍙e畾涔変腑緇ф壙琛屼負銆傚綋綾誨疄鐜扮壒孌婃帴鍙f椂錛屽畠瀹氫箟錛堝嵆灝嗙▼搴忎綋緇欎簣錛夋墍鏈夎繖縐嶆帴鍙g殑鏂規硶銆傜劧鍚庯紝瀹冨彲浠ュ湪瀹炵幇浜嗚鎺ュ彛鐨勭被鐨勪換浣曞璞′笂璋冪敤鎺ュ彛鐨勬柟娉曘傜敱浜庢湁鎶借薄綾伙紝瀹冨厑璁鎬嬌鐢ㄦ帴鍙e悕浣滀負寮曠敤鍙橀噺鐨勭被鍨嬨傞氬父鐨勫姩鎬佽仈緙栧皢鐢熸晥銆傚紩鐢ㄥ彲浠ヨ漿鎹㈠埌鎺ュ彛綾誨瀷鎴栦粠鎺ュ彛綾誨瀷杞崲錛宨nstanceof 榪愮畻絎﹀彲浠ョ敤鏉ュ喅瀹氭煇瀵硅薄鐨勭被鏄惁瀹炵幇浜嗘帴鍙c?
絎簩鍗佷竴錛宎bstract鐨刴ethod鏄惁鍙悓鏃舵槸static,鏄惁鍙悓鏃舵槸native錛屾槸鍚﹀彲鍚屾椂鏄痵ynchronized?
閮戒笉鑳?br>
絎簩鍗佷簩錛屾帴鍙f槸鍚﹀彲緇ф壙鎺ュ彛? 鎶借薄綾繪槸鍚﹀彲瀹炵幇(implements)鎺ュ彛? 鎶借薄綾繪槸鍚﹀彲緇ф壙瀹炰綋綾?concrete class)?
鎺ュ彛鍙互緇ф壙鎺ュ彛銆傛娊璞$被鍙互瀹炵幇(implements)鎺ュ彛錛屾娊璞$被鏄惁鍙戶鎵垮疄浣撶被錛屼絾鍓嶆彁鏄疄浣撶被蹇呴』鏈夋槑紜殑鏋勯犲嚱鏁般?br>
絎簩鍗佷笁錛屽惎鍔ㄤ竴涓嚎紼嬫槸鐢╮un()榪樻槸start()?
鍚姩涓涓嚎紼嬫槸璋冪敤start()鏂規硶錛屼嬌綰跨▼鎵浠h〃鐨勮櫄鎷熷鐞嗘満澶勪簬鍙繍琛岀姸鎬侊紝榪欐剰鍛崇潃瀹冨彲浠ョ敱JVM璋冨害騫舵墽琛屻傝繖騫朵笉鎰忓懗鐫綰跨▼灝變細绔嬪嵆榪愯銆俽un()鏂規硶鍙互浜х敓蹇呴』閫鍑虹殑鏍囧織鏉ュ仠姝竴涓嚎紼嬨?br>
絎簩鍗佸洓錛屾瀯閫犲櫒Constructor鏄惁鍙override?
鏋勯犲櫒Constructor涓嶈兘琚戶鎵匡紝鍥犳涓嶈兘閲嶅啓Overriding錛屼絾鍙互琚噸杞絆verloading銆?br>
絎簩鍗佷簲錛屾槸鍚﹀彲浠ョ戶鎵縎tring綾?
String綾繪槸final綾繪晠涓嶅彲浠ョ戶鎵褲?br>
絎簩鍗佸叚錛屽綋涓涓嚎紼嬭繘鍏ヤ竴涓璞$殑涓涓猻ynchronized鏂規硶鍚庯紝鍏跺畠綰跨▼鏄惁鍙繘鍏ユ瀵硅薄鐨勫叾瀹冩柟娉?
涓嶈兘錛屼竴涓璞$殑涓涓猻ynchronized鏂規硶鍙兘鐢變竴涓嚎紼嬭闂?br>
絎簩鍗佷竷錛宼ry {}閲屾湁涓涓猺eturn璇彞錛岄偅涔堢揣璺熷湪榪欎釜try鍚庣殑finally {}閲岀殑code浼氫笉浼氳鎵ц錛屼粈涔堟椂鍊欒鎵ц錛屽湪return鍓嶈繕鏄悗?
浼氭墽琛岋紝鍦╮eturn鍓嶆墽琛屻?br>
絎簩鍗佸叓錛岀紪紼嬮: 鐢ㄦ渶鏈夋晥鐜囩殑鏂規硶綆楀嚭2涔樹互8絳夋柤鍑?
鏈塁鑳屾櫙鐨勭▼搴忓憳鐗瑰埆鍠滄闂繖縐嶉棶棰樸?br>
2 << 3
絎簩鍗佷節錛屼袱涓璞″肩浉鍚?x.equals(y) == true)錛屼絾鍗村彲鏈変笉鍚岀殑hash code錛岃繖鍙ヨ瘽瀵逛笉瀵?
涓嶅錛屾湁鐩稿悓鐨刪ash code銆?
絎笁鍗侊紝褰撲竴涓璞¤褰撲綔鍙傛暟浼犻掑埌涓涓柟娉曞悗錛屾鏂規硶鍙敼鍙樿繖涓璞$殑灞炴э紝騫跺彲榪斿洖鍙樺寲鍚庣殑緇撴灉錛岄偅涔堣繖閲屽埌搴曟槸鍊間紶閫掕繕鏄紩鐢ㄤ紶閫?
鏄間紶閫掋侸ava 緙栫▼璇█鍙敱鍊間紶閫掑弬鏁般傚綋涓涓璞″疄渚嬩綔涓轟竴涓弬鏁拌浼犻掑埌鏂規硶涓椂錛屽弬鏁扮殑鍊煎氨鏄璇ュ璞$殑寮曠敤銆傚璞$殑鍐呭鍙互鍦ㄨ璋冪敤鐨勬柟娉曚腑鏀瑰彉錛屼絾瀵硅薄鐨勫紩鐢ㄦ槸姘歌繙涓嶄細鏀瑰彉鐨勩?br>
絎笁鍗佷竴錛宻wtich鏄惁鑳戒綔鐢ㄥ湪byte涓婏紝鏄惁鑳戒綔鐢ㄥ湪long涓婏紝鏄惁鑳戒綔鐢ㄥ湪String涓?
switch錛坋xpr1錛変腑錛宔xpr1鏄竴涓暣鏁拌〃杈懼紡銆傚洜姝や紶閫掔粰 switch 鍜?case 璇彞鐨勫弬鏁板簲璇ユ槸 int銆?short銆?char 鎴栬?byte銆俵ong,string 閮戒笉鑳戒綔鐢ㄤ簬swtich銆?br>
絎笁鍗佷簩錛岀紪紼嬮: 鍐欎竴涓猄ingleton鍑烘潵銆?br>
Singleton妯″紡涓昏浣滅敤鏄繚璇佸湪Java搴旂敤紼嬪簭涓紝涓涓被Class鍙湁涓涓疄渚嬪瓨鍦ㄣ?br>
涓鑸琒ingleton妯″紡閫氬父鏈夊嚑縐嶇褰㈠紡:
絎竴縐嶅艦寮? 瀹氫箟涓涓被錛屽畠鐨勬瀯閫犲嚱鏁頒負private鐨勶紝瀹冩湁涓涓猻tatic鐨刾rivate鐨勮綾誨彉閲忥紝鍦ㄧ被鍒濆鍖栨椂瀹炰緥璇濓紝閫氳繃涓涓猵ublic鐨刧etInstance鏂規硶鑾峰彇瀵瑰畠鐨勫紩鐢?緇ц岃皟鐢ㄥ叾涓殑鏂規硶銆?
public class Singleton {
銆銆private Singleton(){}
銆銆//鍦ㄨ嚜宸卞唴閮ㄥ畾涔夎嚜宸變竴涓疄渚嬶紝鏄笉鏄緢濂囨紵
銆銆//娉ㄦ剰榪欐槸private 鍙緵鍐呴儴璋冪敤
銆銆private static Singleton instance = new Singleton();
銆銆//榪欓噷鎻愪緵浜嗕竴涓緵澶栭儴璁塊棶鏈琧lass鐨勯潤鎬佹柟娉曪紝鍙互鐩存帴璁塊棶銆銆
銆銆public static Singleton getInstance() {
銆銆銆銆return instance; 銆銆
銆銆 }
}
絎簩縐嶅艦寮?
public class Singleton {
銆銆private static Singleton instance = null;
銆銆public static synchronized Singleton getInstance() {
銆銆//榪欎釜鏂規硶姣斾笂闈㈡湁鎵鏀硅繘錛屼笉鐢ㄦ瘡嬈¢兘榪涜鐢熸垚瀵硅薄錛屽彧鏄涓嬈°銆銆 銆
銆銆//浣跨敤鏃剁敓鎴愬疄渚嬶紝鎻愰珮浜嗘晥鐜囷紒
銆銆if (instance==null)
銆銆銆銆instance錛漬ew Singleton();
return instance; 銆銆}
}
鍏朵粬褰㈠紡:
瀹氫箟涓涓被錛屽畠鐨勬瀯閫犲嚱鏁頒負private鐨勶紝鎵鏈夋柟娉曚負static鐨勩?br>
涓鑸涓虹涓縐嶅艦寮忚鏇村姞瀹夊叏浜泂

]]> - java闈㈣瘯棰橀泦閿?浜岃緫http://www.tkk7.com/airdream/archive/2006/01/01/26267.htmlAIRDREAMAIRDREAMSun, 01 Jan 2006 11:37:00 GMThttp://www.tkk7.com/airdream/archive/2006/01/01/26267.htmlhttp://www.tkk7.com/airdream/comments/26267.htmlhttp://www.tkk7.com/airdream/archive/2006/01/01/26267.html#Feedback1http://www.tkk7.com/airdream/comments/commentRss/26267.htmlhttp://www.tkk7.com/airdream/services/trackbacks/26267.html闃呰鍏ㄦ枃

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