Javaæ¥å£æ¯ä¸ç³»åæ¹æ³ç声æï¼æ¯ä¸äºæ¹æ³ç¹å¾çéåï¼ä¸ä¸ªæ¥å£åªææ¹æ³çç¹å¾æ²¡ææ¹æ³çå®ç°ï¼å æ¤è¿äºæ¹æ³å¯ä»¥å¨ä¸åçå°æ¹è¢«ä¸åçç±»å®ç°ï¼èè¿äºå®ç°å¯ä»¥å
·æä¸åçè¡ä¸ºï¼åè½ï¼ã
两ç§å«ä¹ï¼ä¸ï¼Javaæ¥å£ï¼Javaè¯è¨ä¸åå¨çç»æï¼æç¹å®çè¯æ³åç»æï¼äºï¼ä¸ä¸ªç±»æå
·æçæ¹æ³çç¹å¾éåï¼æ¯ä¸ç§é»è¾ä¸çæ½è±¡ãåè
å«åâJavaæ¥å£âï¼åè
å«åâæ¥å£âã
æ¥å£åè°æ¯æï¼å¯ä»¥æ使ç¨æä¸æ¥å£çç±»å建ç对象çå¼ç¨èµç»è¯¥æ¥å£å£°æçæ¥å£åéï¼é£ä¹è¯¥æ¥å£åéå°±å¯ä»¥è°ç¨è¢«ç±»å®ç°çæ¥å£çæ¹æ³ãå®é
ä¸ï¼å½æ¥å£åéè°ç¨è¢«ç±»å®ç°çæ¥å£ä¸çæ¹æ³æ¶ï¼å°±æ¯éç¥ç¸åºç对象è°ç¨æ¥å£çæ¹æ³ï¼è¿ä¸è¿ç¨ç§°ä¸ºå¯¹è±¡åè½çæ¥å£åè°ãçä¸é¢ç¤ºä¾ãinterface People{ void peopleList();}class Student implements People{ public void peopleList(){ System.out.println("Iâm a student.")ï¼}}class Teacher implements People{ public void peopleList(){ System.out.println("Iâm a teacher.");}}public class Example{ public static void main(String args[]){ People a; //声ææ¥å£åéa=new Student(); //å®ä¾åï¼æ¥å£åéä¸åæ¾å¯¹è±¡çå¼ç¨a.peopleList(); //æ¥å£åè°a=new Teacher(); //å®ä¾åï¼æ¥å£åéä¸åæ¾å¯¹è±¡çå¼ç¨a.peopleList(); //æ¥å£åè°}}ç»æï¼Iâm a student.Iâm a teacher.åæ¥ççåä¸è½¬åï¼upcastingï¼çæ¦å¿µã
ç¨ Java æ¥å£å®ç°åè°å½æ°ççä»·åè½çæ MS-Windows å X Window System äºä»¶é©±å¨ç¼ç¨æ¨¡åçå¼å人åï¼ä¹ æ¯äºä¼ éå¨æç§äºä»¶åçæ¶è°ç¨ï¼å³âåè°âï¼çå½æ°æéãJava çé¢å对象模åç®å并ä¸æ¯ææ¹æ³æéï¼Java çæ¥å£æ¯ææä¾äºä¸ç§è·å¾åè°ççä»·åè½çæºå¶ãå
¶æ巧就æ¯ï¼å®ä¹ä¸ä¸ªç®åæ¥å£ï¼å¹¶å¨è¯¥æ¥å£ä¸å£°ææ们è¦è°ç¨çæ¹æ³ãåå®æ们å¸æå¨æ个äºä»¶åçæ¶å¾å°éç¥ãæ们å¯ä»¥å®ä¹ä¸ä¸ªæ¥å£ï¼InterestingEvent.javapackage org.zj.sample;public interface InterestingEvent { public void interestingEvent ();}è¿ä½¿å¾æ们å¯ä»¥æ§å¶å®ç°è¯¥æ¥å£çç±»çä»»ä½å¯¹è±¡ãå æ¤ï¼æ们ä¸å¿
å
³å¿ä»»ä½å¤é¨ç±»åä¿¡æ¯ãååºäºä»¶ä¿¡å·çç±»å¿
é¡»çå¾
å®ç°äº InterestingEvent æ¥å£ç对象ï¼å¹¶å¨éå½æ¶åè°ç¨ interestingEvent() æ¹æ³ãEventNotifier.javapackage org.zj.sample;public class EventNotifier { private InterestingEvent ie; private boolean somethingHappened; public EventNotifier(InterestingEvent event) { ie = event; // ä¿åäºä»¶å¯¹è±¡ä»¥å¤åç¨ã somethingHappened = false; // è¿æ²¡æè¦æ¥åçäºä»¶ã } public void doWork() { if (somethingHappened) { // æ£æ¥è®¾ç½®çè°è¯ã ie.interestingEvent();// éè¿è°ç¨æ¥å£çè¿ä¸ªæ¹æ³ååºäºä»¶ä¿¡å·ã } } public void setHappened(){//设置è°è¯ã somethingHappened=true; }}å¨ä¸ä¾ä¸ï¼ä½¿ç¨ somethingHappened è°è¯æ¥è·è¸ªæ¯å¦åºè§¦åäºä»¶ãå¸ææ¥æ¶äºä»¶éç¥ç代ç å¿
é¡»å®ç° InterestingEvent æ¥å£ï¼å¹¶å°èªèº«å¼ç¨ä¼ éç»äºä»¶éç¥ç¨åºãCallMe.javapackage org.zj.sample;public class CallMe implements InterestingEvent { @SuppressWarnings("unused") private EventNotifier en; public CallMe() { // 注æ EventNotifier (InterestingEvent event)ï¼åºè¯¥ä¼ éä¸ä¸ªæ¥å£ç±»åã // èä¸é¢å°thisï¼å³å®ç°äºInterestingEventæ¥å£çCallMeå®ä¾ä¼ éç»//EventNotifierãä¹å°±æ¯æè°çæ¥å£åè°äºã en = new EventNotifier(this); // å建äºä»¶éç¥ç¨åºï¼å¹¶å°èªèº«å¼ç¨ä¼ éç»å®ã } // 为äºä»¶å®ä¹å®é
çå¤çç¨åºã
温馨提示:答案为网友推荐,仅供参考