单项选择题
A. 0 B. 1 C. -1 D. null
A.Output B.Reader C.Writer D.InputStream
class Order implements Runnable { public void run () { try { Thread.sleep (2000) ; } catch (Exception e) System.out.print("in") ; public static void main (String [] args) { Thread t = new Thread (new Order ()) ; t.start () ; System.out.print ("pre ") ; try { t.join () ; } catch (Exception e) { } System.out.print ("post") ; 可产生哪两项结果?()
A. pre in post B. pre in C. in post pre D. in pre post E. pre post in
现有: class Waiting implements Runnable { boolean flag=false; public synchronized void run() { if (flag) { flag=false; System.out.print ("1"); try { this.wait(); ) catch (Exception e) { } System.out.print ("2"); } else { flag=true; System.out.print ("3"); try{Thread.sleep (2000); } catch(Exception e) {} System.out.print ("4"); notify(); } } public static void main (String [] args) { Waiting w=new Waiting(); new Thread (w) .start(); new Thread (w) .start(); } } 以下哪两项是正确的?()
A.代码输出l 3 4 B.代码输出3 4 1 C.代码输出l 2 3 4 D.代码输出1 3 4 2 E.代码运行完毕 F.代码不会完成
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