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]; } }
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
Related questions
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];
}
}
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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