java練習冊(009)--類(1)

1、java課程實踐指導(dǎo)書課程實踐指導(dǎo)書文件編號：YMWI19文件版本：A版文件頁碼：pageof練習冊練習冊——JAVAJAVA篇JAVAJAVA語言中的類（語言中的類（1）一、練習目標:如何在JAVA中構(gòu)造一個類。二、練習時間與作業(yè)要求：本次練習一共需要180分鐘。翻譯練習寫在JAVA筆記本上，書面作業(yè)寫在JAVA家庭作業(yè)本上。后面的書面作業(yè)不包括在這個時間范圍內(nèi)。三、翻譯練習：將下面要求翻譯的內(nèi)容，寫在記事本上（陰影部分不寫出來，要求

2、看懂）1.EverythingEverythingisisananobject.object.Thinkofanobjectasafancyvariableitstesdatabutyoucan“makerequests”tothatobjectaskingittoperfmoperationsonitself.Intheyyoucantakeanyconceptualcomponentintheproblemyou’retryingt

3、osolve(dogsbuildingsservicesetc.)representitasanobjectinyourprogram.2.Aprogramprogramisisabunchbunchofofobjectsobjectstellingtellingeacheachotherotherwhatwhattotododobybysendingsendingmessagesmessages.Tomakearequestofano

4、bjectyou“sendamessage”tothatobject.Meconcretelyyoucanthinkofamessageasarequesttocallamethodthatbelongstoaparticularobject.3.EachEachobjectobjecthashasitsitsownownmemymemymademadeupupofofotherotherobjectsobjects.Putanothe

5、rwayyoucreateanewkindofobjectbymakingapackagecontainingexistingobjects.Thusyoucanbuildcomplexityintoaprogramwhilehidingitbehindthesimplicityofobjects.4.EveryEveryobjectobjecthashasatypetype.Usingtheparlanceeachobjectisan

6、java課程實踐指導(dǎo)書課程實踐指導(dǎo)書文件編號：YMWI19文件版本：A版文件頁碼：pageofinstanceofaclassinwhich“class”issynonymouswith“type.”Themostimptantdistinguishingacteristicofaclassis“Whatmessagescanyousendtoit”5.AllAllobjectsobjectsofofaparticularparticu

7、lartypetypecancanreceivereceivethethesamesamemessagesmessages.Thisisactuallyaloadedstatementasyouwillseelater.Becauseanobjectoftype“circle”isalsoanobjectoftype“shape”acircleisguaranteedtoacceptshapemessages.Thismeansyouc

8、anwritecodethattalkstoshapesautomaticallyhleanythingthatfitsthedeionofashape.ThissubstitutabilityisoneofthepowerfulconceptsinOOP.四、上機練習：1、定義一個判斷閏年的方法，在main方法中調(diào)用該方法判斷輸入的一個年份是否是閏年2、編寫一個立方體類，包含這樣的屬性：長度、寬度、高度等信息，通過方法來計算它的體積。