Create an array of Queues in Java
22,643
you need to initialize your queues:
public PriorityQueue(int maxSize) {
queues = new Queue[maxSize+1];
size = maxSize;
for(int i = 0; i <= maxSize; i++)
queues[i] = new LinkedList<E>();
}
You can pick whatever Queue implementation you want, I just picked LinkedList because it popped in my head first...
Author by
switz
Updated on July 09, 2022Comments
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switz almost 2 years
I'm writing my own PriorityQueue class and I have:
private Queue<E>[] queues; public PriorityQueue(int maxSize) { queues = new Queue[maxSize+1]; size = maxSize; }
This compiles, but when I call
.add
on the priorityQueue I get this error:java.lang.NullPointerException at PriorityQueue.add(PriorityQueue.java:13)
Here's add:
public void add(E item, int priority) { queues[priority].offer(item); }
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switz over 12 yearsPerfect. I knew it was something small, but it was bugging me. +1 as you gave the code to do it.