Java

//=======================Message handling=======================
//===============================================================
	public void clearinbix()
	{
		inbox.clear();
	}
	public void clearoutbox(){
		outbox.clear();
	}
	//for agent to get messages from inbox
	protected ArrayList<Message> getIncomingMessage()
	{
		ArrayList<Message> inmsg=(ArrayList<Message>)inbox.clone();
		tempMessages.addAll(inmsg);
		clearinbix();
		return inmsg;
		
		}
	//simulator to put messages in agent's inbox
	public void putMessage(Message msg)
	{
		inbox.add(msg);
		
	}
	//For agent to place a message in its own outbox
	protected void sendOutGoingMessage(Message msg,Node node)
	{
		msg.setSource(node);
		outbox.add(msg);
	}
	//For Simulator to collect messages in this Agent's outbox
	public ArrayList<Message> getMessages()
	{
		ArrayList<Message> outmsg=(ArrayList<Message>)outbox.clone();
		clearoutbox();
		return outmsg;
		
	}

package exam804;
class Base
{
	public static void foo(Base bObj)
	{
		System.out.println("In Base.foo()");
		bObj.bar();
	}

	public void bar()
	{
		System.out.println("In Base.bar()");
	}
}

class Derived extends Base
{
	public static void foo(Base bObj)
	{
		System.out.println("In Derived.foo()");
		bObj.bar();
	}

	public void bar()
	{
		System.out.println("In Derived.bar()");
	}
}

class OverrideTest
{
	public static void main(String[] args)
	{
		Base bObj = new Derived();
		bObj.foo(bObj);
	}
}