多项选择题
现有如下命令行: java -showversion ShowVersion ShowVERSION SHOWVERSION 哪三个是对的?()
A.这是一个合法调用 B.这是一个非法调用 C.该调用包含一个选项 D.该调用包含两个参数
class Waiting implements Runnable { boolean flag = fal...
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 1 3 4 B.代码输出 3 4 1 C.代码输出 1 2 3 4 D.代码不会完成
哪两个java.lang.Thread方法抛出受检异常?()A.runB.joinC.sleepD.start
多项选择题哪两个java.lang.Thread 方法抛出受检异常?()
A.run B.join C.sleep D.start
class Order implements Runnable { public void run() { ...
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.in pre B.pre in C.in pre post D.pre in post