SCJP 1.6版考題 101

Given:
10. package com.sun.scjp;
11. public class Geodetics {
12. public static final double DIAMETER = 12756.32; //kilometers
13. }
 

Which two correctly access the DIAMETER member of the Geodetics class? (Choose two.)
   A. import com.sun.scjp.Geodetics;
      public class TerraCarta{
         public double halfway()
             {return Geodetics.DIAMETER/2.0;}
   B. import static com.sun.scjp.Geodetics;
      public class TerraCarta{
          public double halfway(){return DIAMETER/2.0;}}
   C. import static com.sun.scjp.Geodetics.*;
      public class TerraCarta{
          public double halfway(){return DIAMETER/2.0;}}
   D. package com.sun.scjp;
      public class TerraCarta{
          public double halfway(){return DIAMETER/2.0;}}

解答

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Ans: A C

解說:

DIAMETER是類別成員，使用時應該是用：類別名.類別成員名字，如A
import static可以簡化使用類別成員時的”類別名.”，可以直接叫用類別成員，如C