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Java认证考试

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Given the following code, which statements concerning the objects referenced through the member variables i, j and k are true, given that any thread may call the methods a, b and c at any time? ()  class Counter {  int v = 0;   synchronized void inc() { v++; }   synchronized void dec() { v--; }   }   public class Q7ed5 {   Counter i;   Counter j;   Counter k;   public synchronized void a() {   i.inc();   System.out.println("a");   i.dec();  }   public synchronized void b() {   i.inc();  j.inc();  k.inc();   System.out.println("b");  i.dec();  j.dec(); k.dec();  }   public void c() {   k.inc();   System.out.println("c");   k.dec();   }   }  

  • A、i.v is guaranteed always to be 0 or 1.
  • B、j.v is guaranteed always to be 0 or 1.
  • C、k.v is guaranteed always to be 0 or 1
  • D、j.v will always be greater than or equal to k.v at any give time.
  • E、k.v will always be greater than or equal to j.v at any give time.
正确答案:A,B
答案解析:
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