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多选题
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


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考题 多选题现有:  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 4B代码输出3 4 1C代码输出l 2 3 4D代码输出1 3 4 2E代码运行完毕F代码不会完成

考题 单选题现有:   class Thread2 implements Runnable {   void run() {   System.out.print("go ");   }   public static void main(String [] args) {   Thread2 t2 = new Thread2();   Thread t = new Thread(t2);   t.start();   }   }   结果为:()A  goB  编译失败C  代码运行,无输出结果D  运行时异常被抛出

考题 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

考题 单选题现有:  1. interface Animal {  2. void eat();  3. }  4.  5. // insert code here  6.  7. public class HouseCat extends Feline {  8. public void eat() { }  9. }   和五个声明:  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(); }  分别插入到第5行,有几个可以通过编译?()A 0B 1C 2D 3

考题 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:()A 1B 2C 3D 4

考题 单选题现有:  class ThreadBoth extends Threaa implements Runnable  {      public void run()  (System.out.print("hi");  }     public static voicl main (String  []  args)  {     Thread tl=new ThreadBoth():      Thread t2 = new Thread (tl):     tl.run():      t2.run():     }          结果为:()A  hi hiB  hiC 编译失败D 运行时异常被抛出