SCJP考題
出自 陳富國維基館
Given:
1. public class Threads4{ 2. public static void main(String[] args){ 3. new Threads4.go(); 4. } 5. public void go(){ 6. Runnable r = new Runnable(){ 7. public void run(){ 8. System.out.print("foo"); 9. } 10. }; 11. Thread t = new Thread(r); 12. t.start(); 13. t.start(); 14. } 15.} What is the result? A. Compilation fails. B. An exception is thrown at runtime. C. The code executes normally and prints "foo"; D. The code executes normally, but nothing is printed.
解答
Ans: E
解說: 一個執行緒只能啟動一次 (t.start()只能下一次)，執行緒是物件，物件相關的動作發生問題是在執行時期產生例外，而不是編譯的錯誤。
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