class Q {       Object[] Q;       int head, tail;       public Q() {             this(10);       }       public Q(int l) {             Q = new Object[l];             head = 0;             tail = 0;       }       public boolean enqueue(Object x) {             if ( <*1*> ) // overflow                        return false;             Q[tail++ % Q.length] = x;             return true;       }       public Object dequeue() {             if ( <*2*> ) // empty queue                   return null;             return Q[head++ % Q.length];       }   }

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Question
Which of the following statements would correctly fill <*1>?

  class Q {
      Object[] Q;
      int head, tail;

      public Q() {
            this(10);
      }

      public Q(int l) {
            Q = new Object[l];
            head = 0;
            tail = 0;
      }

      public boolean enqueue(Object x) {
            if ( <*1*> ) // overflow     
                  return false;
            Q[tail++ % Q.length] = x;
            return true;
      }

      public Object dequeue() {
            if ( <*2*> ) // empty queue
                  return null;
            return Q[head++ % Q.length];
      }
  }
 
tail - Q.length <= head
 
 
 
tail - Q.length < head
 
 
 
tail - Q.length >= head
 
 
 
tail - Q.length > head
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