packagetest;classTarget{publicStringname=hello”;}Whatcandirectlyaccessandchangethevalueofthevariablename?()
A.anyclass
B.onlytheTargetclass
C.anyclassinthetestpackage
D.anyclassthatextendsTarget
A.anyclass
B.onlytheTargetclass
C.anyclassinthetestpackage
D.anyclassthatextendsTarget
第1题
1.publicclassTarget{2.privateinti=0;3.publicintaddOne(){4.return++i;5.}6.}And:1.publicclassClient{2.publicstaticvoidmain(String[]args){3.System.out.println(newTarget().addOne());4.}5.}WhichchangecanyoumaketoTargetwithoutaffectingClient?()
A.Line4ofclassTargetcanbechangedtoreturni++;
B.Line2ofclassTargetcanbechangedtoprivateinti=1;
C.Line3ofclassTargetcanbechangedtoprivateintaddOne(){
D.Line2ofclassTargetcanbechangedtoprivateIntegeri=0;
第2题
A.Itcanbeanyclass.
B.Noclasshasaccesstobase.
C.Theclassmustbelongtothegeometrypackage.
D.TheclassmustbeasubclassoftheclassHypotenuse.
第3题
A.p0=p1;
B.p1=p2;
C.p2=p4;
D.p2=(ClassC)p1;
E.p1=(ClassB)p3;
F.p2=(ClassC)p4;
第4题
11.classAnimal{publicStringnoise(){returnpeep”;}}12.classDogextendsAnimal{13.publicStringnoise(){returnbark”;}14.}15.classCatextendsAnimal{16.publicStringnoise(){returnmeow”;}17.}.....30.Animalanimal=newDog();31.Catcat=(Cat)animal;32.System.out.printIn(cat.noise());Whatistheresult?()
A.peep
B.bark
C.meow
D.Compilationfails.
E.Anexceptionisthrownatruntime.
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