Module 2- 类、接口以及枚举.docx

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1、此文档收集于网络，如有侵权，请联系网站删除CopyrightTarenaCorporation,2008.Allrightsreserved Module2-类、接口以及枚举 一、选择题：Question1 Given: 11.publicinterfaceStatus{ 12./*insertcodehere*/intMY_VALUE=10; 13.} Whichthreearevalidonline12?(Choosethree.) A.final B.static C.native D.public E.p

2、rivate F.abstract G.protected Answer:ABD Question2 Given: 10.classFoo{ 11.staticvoidalpha(){/*morecodehere*/} 12.voidbeta(){/*morecodehere*/} 13.} Whichtwoaretrue?(Choosetwo.) A.Foo.beta()isavalidinvocationofbeta(). B.Foo.alpha()isavalidinvocationofalpha(). C

3、.Methodbeta()candirectlycallmethodalpha(). D.Methodalpha()candirectlycallmethodbeta(). Answer:BC Question3 ClicktheExhibitbutton. 11.classPayload{ 12.privateintweight; 13.publicPayload(intwt){weight=wt;} 14.publicPayload(){} 15.publicvoidsetWeight(mtw){weight

4、=w;} 16.publicStringtoString{returnInteger.toString(weight);} 17.} 18. 19.publicclassTestPayload{ 20.staticvoidchangePayload(Payloadp){ 21./*insertcodehere*/CopyrightTarenaCorporation,2008.Allrightsreserved 22.} 此文档仅供学习与交流此文档收集于网络，如有侵权，请联系网站删除23. 24.publicsta

5、ticvoidmain(String[]args){ 25.Payloadp=newPayload(); 26.p.setWeight(1024); 27.changePayload(p); 28.System.out.println("Thevalueofpis"+p); 29.} 30.} Whichstatement,placedatline21,causesthecodetoprint“The valueofpis420.”? A.p.setWeight(420); B.p.changePayload(4

6、20); C.p=newPayload(420); D.Payload.setWeight(420); E.p=Payload.setWeight(420); F.p=newPayload(); p.setWeight(420); Answer:A Question4 ClicktheExhibitbutton. 1.publicclassItem{ 2.privateStringdesc; 3.publicStringgetDescription(){returndesc;} 4.publicvoidsetDe

7、scription(Stringd){desc=d;} 5. 6.publicstaticvoidmodifyDesc(Itemitem,Stringdesc){ 7.item=newItem(); 8.item.setDescription(desc); 9.} 10.publicstaticvoidmain(String[]args){ 11.Itemit=newItem(); 12.it.setDescription("Gobstopper"); 13.Itemit2=newItem(); 14.it2.s

8、etDescription("Fizzylifting"); 15.modifyDesc(it,"Scrumdiddlyumptious"); 16.System.out.println(it.getDescription()); 17.System.out.println(it2.getDescription()); 18.} 19.} Whatistheoutcome