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Given:Which code, inserted at line 16, will cause a java.lang.ClassCastException?()A.Alpha a = x;B.Foo f = (Delta)x;C.Foo f = (Alpha)x;D.Beta b = (Beta)(Alpha)x;

题目
Given:Which code, inserted at line 16, will cause a java.lang.ClassCastException?()

A.Alpha a = x;

B.Foo f = (Delta)x;

C.Foo f = (Alpha)x;

D.Beta b = (Beta)(Alpha)x;

相似考题

1.Given：11.<servlet>12.<servlet-name>catalog</servlet-name>13.<jsp-file>/catalogTemplate.jsp</jsp-file>14.<load-on-startup>10</load-on-startup>15.</servlet>Whichtwoaretrue？（）A.Line13isnotvalidforaservletdeclaration.B.Line14isnotvalidforaservletdeclaration.C.Oneinstanceoftheservletwillbeloadedatstartup.D.Teninstancesoftheservletwillbeloadedatstartup.E.Theservletwillbereferencedbythenamecataloginmappings.

2.Given:When the doSomething method is called, after which line does the Object created in line 5 become available for garbage collection?()A.Line 5B.Line 6C.Line 7D.Line 8E.Line 9F.Line 10

3.Given:WhichlineofcodemarkstheearliestpointthatanobjectreferencedbyintObjbecomesacandidatefor garbagecollection?()A.Line16B.Line17C.Line18D.Line19

4.Click the Exhibit button.Given:What is the result?()A.Line 26 prints "a" to System.out.B.Line 26 prints "b" to System.out.C.An exception is thrown at line 26 at runtime.D.Compilation of class A will fail due to an error in line 6.

参考答案和解析
参考答案：B
更多“Given:Which code, inserted at line 16, will cause a java.lang.ClassCastException?() ”相关问题

  • 第1题：

    Given：11.publicvoidgenNumbers（）{12.ArrayListnumbers=newArrayList（）；13.for（inti=0；i<10；i++）{14.intvalue=i*（（int）Math.random（））；15.IntegerintObj=newInteger（value）；16.numbers.add（intObj）；17.}18.System.out.println（numbers）；19.}WhichlineofcodemarkstheearliestpointthatanobjectreferencedbyintObjbecomesacandidateforgarbagecollection？（）

    A.Line19

    B.TheobjectisNOTacandidateforgarbagecollection.

    C.Line17

    D.Line16

    E.Line18


    参考答案：A

  • 第2题：

    Given:Which code, inserted at line 16, correctly retrieves a local instance of a Point object?()

    A.Point p = Line.getPoint();

    B.Line.Point p = Line.getPoint();

    C.Point p = (new Line()).getPoint();

    D.Line.Point p = (new Line()).getPoint();


    参考答案：D

  • 第3题：

    Given:35.Stringname="JaneDoe";36.int$age=24;37.Double_height=123.5;38.double~temp=37.5;Whichtwostatementsaretrue?()

    A.Line35willnotcompile.

    B.Line36willnotcompile.

    C.Line37willnotcompile.

    D.Line38willnotcompile.


    参考答案：A, D

  • 第4题：

    Given:WhichchangecanyoumaketoTargetwithoutaffectingClient?()

    A.Line4ofclassTargetcanbechangedtoreturni++；

    B.Line2ofclassTargetcanbechangedtoprivateinti=1；

    C.Line3ofclassTargetcanbechangedtoprivateintaddOne（）{

    D.Line2ofclassTargetcanbechangedtoprivateIntegeri=0；


    参考答案：D

  • 第5题：

    Given:WhichstatementistrueifaResourceExceptionisthrownonline86?()

    A.Line92willnotexecute.

    B.Theconnectionwillnotberetrievedinline85.

    C.Theresourceconnectionwillnotbeclosedonline88.

    D.Theenclosingmethodwillthrowanexceptiontoitscaller.


    参考答案：C

  • 第6题：

    The relative pronoun "which" in the last paragraph (Line 6) refers to （　　）.

    A.experts
    B.periods
    C.theories
    D.issues

    答案：D
    解析：

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