techindepth

public class AnishCustomer implements Observer{

	@Override
	public void update(String status) {
		if(status.equals("Available"))
			System.out.println("Anish: Yeah!!!! Going to buy!!!");
		
	}
	
}

techindepth

public class ObserverPatternTest {
	public static void main(String[] args) {
		Observer akhil = new AkhilCustomer();
		 Observer anish = new AnishCustomer();
		 FlipkartMINote5Pro flipkart = new FlipkartMINote5Pro();
		 flipkart.setProductStatus("Out of Stock");
		 flipkart.registerObserver(akhil);
		 flipkart.registerObserver(anish);
		 flipkart.setProductStatus("Available");
	}

techindepth

public interface Iterator {
	public boolean hasNext();
	public Object next();
}

techindepth

public interface Container {
 public Iterator getIterator();
}

techindepth

public class IPODMini implements Container{

	public String tracks[] = {"Chaar Bottle Vodka" , "Badtameez Dil" ,"Kal Ho Naa Ho" , "Chaiyya Chaiyya"};
	
	@Override
	public Iterator getIterator() {
		
		return new TrackIterator();
	}
	

techindepth

public class IteratorPatternTest {
	public static void main(String[] args) {
		IPODMini myIPOD = new IPODMini();
		Iterator trackIterator = myIPOD.getIterator();
		
		while(trackIterator.hasNext()) {
			System.out.println("Playing ... "+ (String)trackIterator.next());
		} 	
	}
}

techindepth

abstract class ChessPiece implements Cloneable {
	protected String currentPosition;
	protected String pieceType;
	abstract void moveTo(String position);
	public Object clone() 
    { 
        Object clone = null; 
        try 
        { 
            clone = super.clone(); 

techindepth

public class Bishop extends ChessPiece{

	public Bishop() {
		this.pieceType="Bishop";
	}
	@Override
	void moveTo(String position) {
		this.currentPosition = position;
		System.out.println(pieceType+" Piece Moved to - "+ position);
		

techindepth

public class King extends ChessPiece{
	
	public King() {
		this.pieceType="King";
	}

	@Override
	void moveTo(String position) {
		this.currentPosition= position;
		System.out.println(pieceType+" Piece Moved to - "+ position);

techindepth

public class Pawn extends ChessPiece{
	public Pawn() {
		this.pieceType="Pawn";
	}
	@Override
	void moveTo(String position) {
		this.currentPosition = position;
		System.out.println(pieceType+" Piece Moved to - "+ position);
	}
}