To implement a hash table, we need to understand the concept of hashing. Hashing is a technique that maps data to a fixed-size array called a hash table using a hashing function. The hashing function takes the data as input and produces a unique numeric value called a hash code. This hash code serves as the index where the data will be stored in the hash table.

For example, let's consider a hash table with 10 buckets. We want to store a key-value pair {"name": "John"}. To determine the index for this pair, we apply a hashing function to the key "name". The hashing function returns a hash code, let's say 123456. We then take the modulus of this hash code with the size of the hash table (10), which gives us the index 6. So, the key-value pair {"name": "John"} will be stored in bucket 6 of the hash table.

Here's an example implementation of a hashing function in Java:

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import java.util.ArrayList;

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class HashTable<K, V> {

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    private static final int SIZE = 10;

    private ArrayList<Entry<K, V>>[] buckets;

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    public HashTable() {

        this.buckets = new ArrayList[SIZE];

    }

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    private int getIndex(K key) {

        int hashCode = key.hashCode();

        int index = Math.abs(hashCode % SIZE);

        return index;

    }

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    // Other methods

}