SCJP題庫第016題
5. class Atom{
6. Atom(){System.out.print("atom ");}
7. }
8. class Rock extends Atom{
9. Rock(String type){System.out.print(type);}
10. }
11. public class Mountain extends Rock{
12. Mountain(){
13. super("granite ");
14. new Rock("granite ");
15. }
16. public static void main(String[] a){new Mountain();}
17. }
What is the result?
A. Compilation fails.
B. atom granite
C. granite granite
D. atom granite granite
E. An exception is thrown at runtime.
F. atom granite atom granite
Ans:F
解說:
記住，若建構子中未寫this或super的呼叫敘述，編譯器會在建構子的首行加上super()，以此例來說，建立Mountain物件時，先叫用super(“granite”)，呼叫其父類別Rock的建構子，此建構子會再呼叫其父類別Atom的建構子，因此，會先印出atom…
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