A.WriteHelloEraseHello
B.EraseHelloWriteHello
C.编译错误
D.运行时抛出异常
第1题
现有:classPencil{publicvoidwrite(Stringcontent){System.out.println("Write"+content);}}classRubberPencilextendsPencil{publicvoidwrite(Stringcontent){System.out.println("RubberWrite"+content);}publicvoiderase(Stringcontent){System.out.println("Erase"+content);}}执行下列代码的结果是哪项?()Pencilpen=newRubberPencil();pen.write("Hello");
A.WriteHello
B.RubberWriteHello
C.编译错误
D.运行时抛出异常
第2题
现有:classPencil{publicvoidwrite(Stringcontent){System.out.println("Write",+content){}}classRubberPencilextendsPencil{publicvoidwrite(Stringcontent){System.out.println("RubberWrite"+content);}publicvoiderase(Stringcontent)}}执行下列代码的结果是哪项?()Pencilpen=newPencil();((RubberPencil)pen).write("Hello");
A.WriteHello
B.RubberWriteHello
C.编译失败
D.运行时抛出异常
第3题
现有:classTestA{publicvoidstart(){System.out.println("TestA");}}publicclassTestBextendsTestA{publicvoidstart(){System.out.println("TestB");}publicstaticvoidmain (string[]args)(((TestA)newTestB()).start();)}运行结果是哪项?()
A.TeStA
B.TeStB
C.编译失败
D.运行时抛出异常
第4题
A.a
B.b
C.编译失败
D.运行时抛出异常
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