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新華信國際信息咨詢JAVA工程師筆試題和面試題答案(四)

更新:2023-09-18 13:10:37 高考升學(xué)網(wǎng)

  1.package packageX.packageY;

  2.

  3.public class SubclassY extends SuperclassX

  4.{

  5.SuperclassX objX = new SubclassY();

  6.SubclassY objY = new SubclassY();

  7.void subclassMethodY()

  8.{

  9.objY.superclassMethodX();

  10.int i;

  11.i = objY.superclassVarX;

  12.}

  13.}

  Choices:

  What will be the result of executing the following code?

  // Filename; SuperclassX.java

  package packageX;

  public class SuperclassX

  {

  protected void superclassMethodX()

  {

  }

  int superclassVarX;

  }

  // Filename SubclassY.java

  1.package packageX.packageY;

  2.

  3.public class SubclassY extends SuperclassX

  4.{

  5.SuperclassX objX = new SubclassY();

  6.SubclassY objY = new SubclassY();

  7.void subclassMethodY()

  8.{

  9.objY.superclassMethodX();

  10.int i;

  11.i = objY.superclassVarX;

  12.}

  13.}

  Choices:

  A.Compilation error at line 5

  B.Compilation error at line 9

  C.Runtime exception at line 11

  D.None of these

  12:Which statement about listener is true?

  A.Most component allow multiple listeners to be added.

  B.If multiple listener be add to a single component, the event only affected one listener.

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