相关考题
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多项选择题
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 -
多项选择题
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 -
单项选择题
现有: 5. class Order2 implements Runnable { 6. public void run() { 7. for (int x- o; x<4; x++) { 8. try{Thread.sleep(100); )catch (Exception e) { } 9. System.out.print("r"); 10. } } 11. public static void main(string [] args) { 12. Thread t=new Thread(new order2()); 13. t.start(); 14. for(int x=0; x<4; x++) { 15. //insert code here 16. System.out.print("m"); 17. } } } 哪一个插入到第15行,最有可能产生输出 rmrmrmrm?()
A. Thread.sleep(1);
B. Thread.sleep(100);
C. Thread.sleep(1000);
D. try{ Thread.sleep(1); ) catch (Exception e) { }
E. try{Thread.sleep(100); ) catch (Exception e) { }
F. try{Thread.sleep(1000); ) catch (Exception e) { }
