Hash Table java (ONLY EDIT WHERE "YOUR CODE HERE" IS WRITTEN)

IHash has the interface to the hashing implementation, and HashTable is the file with your implementation. Implement all of the methods in the interface.

Conceptually,

Each hashTable is a table (implemented as an array list) indexed by hashCode % size.

Each entry in the table contains a hashBucket.

You will need to decide which data structure you wish to use for the hashBuckets. Good candidates include an ArrayList or LinkedList.

WARNING

Create a working version of the assignment before trying to optimize

HashIterator

This is the last part of the HashTable class and will take time to conceptualize.

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import java.util.*;

public class HashTable implements IHash {

// Method of hashing

HashFunction hasher;

// Hash table : an ArrayList of "buckets", which store the actual strings

ArrayList> hashTable;

/**

* Number of Elements

*/

int numberOfElements;

int size;

/**

* Initializes a new instance of HashTable.

*

* Initialize the instance variables.

* Note: when initializing the hashTable, make sure to allocate each entry in the HashTable

* to a new a HashBucket or null, your choice.

* @param size the size of the hashTable

* @param hasher the type of hashing function

*/

public HashTable(int size, HashFunction hasher) {

// YOUR CODE HERE

}

public boolean insert(String key) {

// YOUR CODE HERE

return false;

}

public boolean remove(String key) {

// YOUR CODE HERE

return false;

}

public String search(String key) {

// YOUR CODE HERE

return null;

}

public int size() {

// YOUR CODE HERE

return size;

}

public int size(int index) {

// YOUR CODE HERE

return 0;

}

// Return iterator for the entire hashTable,

// must iterate all hashBuckets that are not empty

public class HashIterator implements Iterator {

// The current index into the hashTable

private int currentIndex;

// The current iterator for that hashBucket

private Iterator currentIterator = null;

HashIterator() {

// YOUR CODE HERE

}

public String next() {

// YOUR CODE HERE

return null;

}

public boolean hasNext() {

// YOUR CODE HERE

return false;

}

}

// Return an iterator for the hash table

public Iterator iterator() {

// YOUR CODE HERE

return null;

}

/**

* Does not use the iterator above. Iterates over one bucket.

*

* @param index the index of bucket to iterate over

* @return an iterator for that bucket

*/

public Iterator iterator(int index) {

List bucket = hashTable.get(index);

return bucket != null ? bucket.iterator() : null;

}

// Prints entire hash table.

// NOTE: This method is used extensively for testing.

public void print() {

Debug.printf("HashTable size: " + size());

for (int index = 0; index < hashTable.size(); index++) {

List list = hashTable.get(index);

if (list != null) {

Debug.printf("HashTable[%d]: %d entries", index, list.size());

for (String word : list) {

Debug.printf("String: %s (hash code %d)", word, hasher.hash(word));

}

}else {

Debug.printf("HashTable[%d]: %d entries", index, 0);

}

}

}

}