用数组实现队列

package com.example;

/**
 * description
 *
 * @author zhanghaohao089
 * @date 2017/8/15
 */

public class Queue {

    private int[] array;
    private int front;
    private int max;
    private int count;
    private int end;

    public Queue(int max) {
        this.max = max;
        array = new int[max];
        front = 0;
        end = -1;
    }

    public boolean isEmpty() {
        return count == 0;
    }

    public boolean isFull() {
        return count == max;
    }

    public void enqueue(int t, boolean pro) {
        if (isFull())
            throw  new IllegalAccessError("IS FULL");
        if (++end == max)
            end = 0;
        array[end] = t;
        count ++;
    }

    public int dequeue() {
        if (isEmpty())
            throw new NullPointerException("is null");
        int value = array[front];
        array[front] = -1;
        front++;
        if (front == max)
            front = 0;
        count --;
        return value;
    }

}