錯誤：private Array<E> array;，沒有加<E>
忘記寫@Override
public string toString() {

}

在循環(huán)隊列中，dequeue操作中，下面兩句寫反了：
data[head] = null;
head = (head + 1) % (data.length);

private void resize(int newCapactiy) {
        E[] newData = (E[]) new Object[newCapactiy + 1]; //+1忘寫了
        for (int i = 0; i < size; i++) {
            newData[i] = data[(head + i) % data.length];
        }

       //下面三句忘寫了
        data = newData;
        head = 0;
        tail = size;
}