第三行代碼有警告，請問怎樣去除。報錯信息我注釋在了警告行上面。class MyHashMap<K, V> {    public static final int SIZE = 1000;    //Type safety: The expression of type MyHashMap.Entry[] needs unchecked conversion to conform to MyHashMap.Entry<K,V>[]    public Entry<K, V>[] tables = new Entry[SIZE];        public void put(K key, V value) {        int index = key.hashCode() % SIZE;        while(tables[index] != null) {            index++;        }        tables[index] = new Entry<K, V>();        tables[index].key = key;        tables[index].value = value;        tables[index].hash = key.hashCode();    }        public V get(K key) {        int index = key.hashCode() % SIZE;        while(tables[index] != null && key.hashCode() !=  tables[index].hash                &&!key.equals(tables[index].key)) {            index++;        }        return tables[index].value;    }        static class Entry<K, V> {        int hash;        K key;        V value;    }}