SEPARATE_CHAINING

import java.util.*;

public class SeparateChaining<T>
{	
	private static final int DEFAULT_TABLE_SIZE = 101;
	private List<T>[] theLists;
	private int currentSize;
	
	public SeparateChaining()
	{
		this(DEFAULT_TABLE_SIZE);
	}
	
	public SeparateChaining(int size)
	{
		theLists = new LinkedList[size];
		for(int i=0; i<theLists.length; i++)
			theLists[i] = new LinkedList<>();
	}
	
	public void insert(T element)
	{
		List<T> whichList = theLists[myhash(element)];
		if(!whichList.contains(element))
		{
			whichList.add(element);
			currentSize++;
		}
	}
	
	public void remove(T element)
	{
		List<T> whichList = theLists[myhash(element)];
		if(whichList.contains(element))
		{
			whichList.remove(element);
			currentSize--;
		}
	}
	
	public boolean contains(T element)
	{
		List<T> whichList = theLists[myhash(element)];
		return whichList.contains(element);
	}
	
	public void makeEmpty()
	{
		for( int i = 0; i < theLists.length; i++ )
			theLists[ i ].clear();
		currentSize = 0;
	}
	
	private int myhash(T element)
	{
		int hashValue = element.hashCode();
		hashValue %= theLists.length;
		if(hashValue < 0)
			hashValue += theLists.length;
		return hashValue;
	}
	
	public void showAll()
	{
		for(int i=0; i<theLists.length; i++)
			System.out.println("Chain "+i+" : "+theLists[i]);
	}
	
	public static void main(String[] args)
	{
		SeparateChaining<String> sc = new SeparateChaining(7);
		sc.insert("hello"); sc.insert("java"); sc.insert("world"); sc.insert("programming");
		sc.insert("separate"); sc.insert("chaining");
		System.out.println("java is present " + sc.contains("java"));
		sc.showAll();
		
	}
	
}