Question

嘿我一直在尝试打印我的哈希表，但即使我使用toArray和toString方法，所有打印的都是内存位置。我真的很困惑，因为我认为阵列和弦都是针对这个问题的。任何帮助，将不胜感激。

我声明我的哈希表如下：

 HashTable<Integer,EmployeeInfo> phone =  new HashTable<>(300);

同样，当我尝试这些时，我得到的只是内存位置而不是哈希表所包含的实际数据。例如，当我执行phone.toString（）时，我得到的是：hashing.HashTable@55f96302。任何帮助将不胜感激，谢谢:)。

package hashing;

import java.util.Arrays;

public class Hash {

public static void main(String[] args) {
    // TODO Auto-generated method stub

     HashTable<Integer,EmployeeInfo> phone =  new HashTable<>(300);
     System.out.println(phone.toString());
}

public static class HashTable<K,V>
{
    private int numberEntries;
    private static final int DEFAULT_CAPACITY = 5;

    private HashHolder<K,V>[] hashTable;
    private int tableSize;

    public HashTable()
    {
        this(DEFAULT_CAPACITY);
    }


    public HashHolder<K,V>[] toArray()
    {
        int size = hashTable.length;
        @SuppressWarnings("unchecked")
        HashHolder<K,V>[] tempArray = Arrays.copyOf(hashTable,size);//(HashHolder<K,V>[]) new Object[size];
        return tempArray;
    }
    public HashTable(int initCapacity)
    {   
        //Note: I'm not implementing a rigorous check for capacity constraints here.  I probably should...
        @SuppressWarnings("unchecked")
        HashHolder<K,V>[] temp = (HashHolder<K,V>[]) new HashHolder[initCapacity];
        hashTable = temp;

        numberEntries = 0;
    }



}

public static class HashHolder<K,V> 
{
    private K hashKey;
    private V data;
    private HashHolder<K,V> next;
    private States state;
    private enum States {CURRENT,REMOVED};


    @Override
    public String toString()
    {
        if(state != States.REMOVED)
            return String.format("%s: %s", hashKey.toString(), data.toString());
        else
            return String.format("REMOVED");
    }
    public HashHolder(K key, V value)
    {
        hashKey = key;
        data = value;
        state = States.CURRENT;
    }

}

}

Answer 1

您的HashTable类需要自己的toString()方法，以产生一些合理的输出。否则，您只会从toString获得默认的Object行为，该行为会打印出您所看到的无用hashing.HashTable@55f96302。

试图打印哈希表但我不断获取内存位置

1 个答案: