jd1208corejava一、選擇填空題不定項(xiàng)選題只有全部正確才能得分

班級(jí) 日期CoreJava一、選擇填空題：(選題，只有全部正確才能得分。在一個(gè)java原文件中，import,class,package語(yǔ)句的順序 importclassclassimportpackageclassimportpackageclasspackagepackageimport javaclassjavapublic以下能作為class,interface,method或variable有效標(biāo)識(shí)符的 D. E.my 以下不是java關(guān)鍵字的 A. staticpublicvoidmain(String[]args){Stringstr1=“ab”+“c”;Stringstr2=newString(“abc”);Stringstr3=ern();}A. false B. C.false D.falsefalse publicstaticvoidmain(String[]args){ num=1;num=num++;}A. D. publicstaticvoidmain(String[]args){intnum=1;num+=num=num+3.2;}num3.2numnum3.2 publicclassTeststaticinttotal=publicstaticvoidmain(Stringargs[]){newTest();}publicTest()System.out.println("Intest");inttemp=this.total;if(temp>5){}}} C.編譯運(yùn)行都正jdk1.7之后switch中可以是以下哪些 A.B.C. D.E.G. I.J.在面向?qū)ο缶幊讨?，一個(gè)類型 組成。面向?qū)ο蟮奶匦园? H.default(no publicstaticsynchronizedvoidwriog(Stringsynchronizedpublicstaticwriog(Stringpublic voidwriog(Stringfinalpublicvoidwriog(Stringsynchronizedvoidwriog(StringJava方法的參數(shù)傳遞對(duì)于基本數(shù)據(jù)類型如int,byte等，參數(shù)傳遞是 A.by B.by C.by D.by publicclassArugmentTest{staticclassIntA{privateintpublicIntA(inta){this.a=a;}publicintgetA(){returna;}publicvoidsetA(inta){this.a=a;}}staticpublicvoidchange(inta){a=3;}staticpublicvoidchange(IntAa){}staticpublicvoidchangeRef(IntAa){a=newIntA(9);}publicstaticvoidmain(String[]args){inta=2;IntAia=newIntA(5);}} A.23 在不同class中定義的方 C.方法名必須相 E.參數(shù)一定不 在java語(yǔ)法中允許 A. B. C. D. E. A.方法覆蓋發(fā)生在同一類中B.方法的覆蓋發(fā)生在子類型中 publicvoiddrive(){}}classCarextendsVehicle{publicvoiddrive(){}}publicclassTestpublicstaticvoidmain(Stringargs[]){Vehiclev;Carv=newVehicle();c=newCar();v=c;}} v=c；會(huì)導(dǎo)致編譯錯(cuò)誤B.v=c;會(huì)導(dǎo)致運(yùn)行錯(cuò)誤Car:driveCar:driveCar:drive finalclass不能被繼 class一定 class可以沒(méi) class的目的是為了被繼承D.interface中定義的方法全是 E.interface中定義的變量全部是finalstatic變量innerclass的類型 memberinner B.staticinnerC.localinner D.anonymousinnerE.publicinner 關(guān)于內(nèi)部類說(shuō)法正確的 A.內(nèi)部類中不能定義構(gòu)造方B.內(nèi)部類不能有屬C.內(nèi)部類擁有一個(gè)與父類參數(shù)列表相同的構(gòu)造方法,但這個(gè)構(gòu)造方法根據(jù)調(diào)用確D.內(nèi)部類只能有方 staticfinal publicstaticfinal publicinttest()intnum=1;returnnum=}return} B.返回C.返回 D.返回如果你想將一組對(duì)象按一定順序存取，在不考慮并發(fā)的情況下會(huì)使 ,反之則會(huì)使 ；如果你想一組無(wú)序但唯一的對(duì)象，你會(huì)使用 ;如果你想按關(guān)鍵字對(duì)對(duì)象進(jìn)行存 ,反之則會(huì)使用 publicclasspublicdoublediv(doublea,doubleb){return}catch(Exceptione){System.out.println(“Exceptionthrown”);}}publicstaticvoidmain(String[]args){ExceptionTestet=newExceptionTest();et.div(1,2);et.div(3.4,}} Releaseresources.ExceptionthrownRelease又叫做uncheckedexception。CheckedException通常繼 ,在程序中產(chǎn)生異常用關(guān)鍵字 B. C.D. 接口中所有方法均為publicJavajava.langjava中，無(wú)用對(duì)象()一定是沒(méi)有的對(duì)象并賦值：longOracle(1)Chang}}packagepublic privateString (String}publicStringgetName()return}publicvoidsetName(Stringname)=}publicStringtoString()}publicstaticvoidmain(String[]args){ }}EmployeepublicclassEmployee privatedoublesalary;privateStringhireDay;publicEmployee(){}privateEmployee(Stringname,doublesalary,StringhireDay){}publicdoublegetSalary()return}publicvoidsetSalary(doublesalary)this.salary=}publicStringgetHireDay()returnpublicvoidsetHireDay(StringhireDay)this.hireDay=}publicStringtoString()returnsuper.toString()+"salary:"+salary+"}publicstaticvoidmain(String[]args)}}publicclassManagerextendsprivatedoublepublicManager()publicManager(Stringname,doublesalary,StringhireDay,doublebonus){}publicdoublegetBonus()return}publicvoidsetBonus(doublebonus)this.bonus=}publicdou