循环队列java编程

Question

我试图在队列中循环插入项目..我有以下代码，但它没有正确插入它们。有什么问题？

public boolean insert(int element){
    if ( head == -1 && tail == -1 ){
        head = 0;
        tail = 0;
        elements[tail] = element;
        return true;
    }  
    else if((tail+1)%capacity == head) {
        System.out.println("Full");
        return false;
    }
    else {
        tail = (tail+1)%capacity;
        elements[tail] = element;
        return true;
    }
}

Answer 1

public boolean insert(int element){
    if (getCapacity() == capacity) {
        System.out.println("Queue is full.");
        return false;
    }else {
        elements[tail] = element;
        tail = (tail+1)%capacity;
        n++;
       return true;
    }
}

和

public int getCapacity(){
    return n;
}