SCJP題庫第094題

11. public class Rainbow {

12.   public enum MyColor {

13.     RED(0xff0000), GREEN(0x00ff00), BLUE(0x0000ff);

14.     private final int rgb;

15.     MyColor(int rgb){this.rgb = rgb;}

16.     public int getRGB(){return rgb;}

17.   }

18.   public static void main(String[] args){

19.     //insert code here

20.   }

21. }

Which code fragment inserted at line 19, allows the Rainbow class to compile?

A. MyColor skyColor = BLUE;

B. MyColor treeColor = MyColor.GREEN;

C. if(RED.getRGB() < BLUE.getRGB()){}

D. Compilation fails due to other error(s) in the code.

E. MyColor purple = new MyColor(0xff00ff);

F. MyColor purple = MyColor.BLUE + MyColor.RED;

 

Ans: B

 

解說:

第19行插入那一個程式片段可使Rainbow類別可以被編譯？

列舉型態可視為類別的內部靜態類別，使用時以使用靜態成員的方式。

 MyColor treeColor = MyColor.GREEN;