多选题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 4B代码输出 3 4 1C代码输出 1 2 3 4D代码不会完成

多选题
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


参考解析

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单选题现有:  interface Animal {       void eat () ;       }       //insert code here       public class HouseCat extends Feline {       public void eat() { }       }  和五个申明  abstract class Feline implements Animal { }  abstract  class  Feline  implements  Animal  {  void eat () ;  }  abstract class Feline implements Animal { public void eat();}  abstract class Feline implements Animal { public void eat() {}  }  abstract class Feline implements Animal { abstract public void eat();} 结果为:()A1B2C3D4