SCJP題庫第231題

 

Given:

11. Runnable r = new Runnable(){

12.   public void run(){

13.     System.out.print("Cat");

14.   }

15. };

16. Thread t = new Thread(r){

17.   public void run(){

18.     System.outprint("Dog");

19.   }

20. };

21. t.start();

What is the result?

A. Cat

B. Dog

C. Compilation fails.

D. The code runs with no output.

E. An exception is thrown at runtime.

Ans: B
解說:


17~19的run覆蓋掉定義在12~14的run方法，執行緒被啟動後(start)，會跳至run方法來執行。