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    新華信國(guó)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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