Ok, so I've been away from pretty much all types of programming for the past few months. School took over, and I got a new computer (where I couldn't figure out how to install and configure my IDE's/SDK's). Anyways, I managed to get the Android ADK to work, and I was working on a simple program to get me back into the swing of things -- Towers of Hanoi. (For those of you who don't know what the Towers of Hanoi are, check out the Wikipedia article on it.)

I have three classes right now - Tower Activty, Tower, and Disc. Tower has methods for keeping track of which discs are on it, and Disc has a method for moving the disc to another tower and keeping track of the disc sizes (making sure the rules are followed). Right now, Tower Activity just initializes 4 discs and sets them to the left tower. It's just getting started, but I'd be interested to know what you think!

Tower Activity

package com.camdroid.towers;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class TowersActivity extends Activity {
	
	TextView leftTower;
	TextView middleTower;
	TextView rightTower;
	
	Tower left = new Tower(1);
	Tower t2 = new Tower(2);
	Tower t3 = new Tower(3);
	Disc d1 = new Disc(1);
	Disc d2 = new Disc(2);
	Disc d3 = new Disc(3);
	Disc d4 = new Disc(4);
	
	
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        Init();
        
        //setContentView(R.layout.main);
    }
    public void Init()
    {
    	leftTower = (TextView)findViewById(R.id.left_tower);
    	middleTower = (TextView)findViewById(R.id.middle_tower);
    	rightTower = (TextView)findViewById(R.id.right_tower);
    	d1.setTower(left);
    	d2.setTower(left);
    	d3.setTower(left);
    	d4.setTower(left);
    	ShowDiscs();
    }
    public void ShowDiscs()
    {
    	leftTower.setText(left.listDiscs());
    	middleTower.setText(""+t2.listDiscs());
    	rightTower.setText(t3.listDiscs());
    }
}

Disc

package com.camdroid.towers;

public class Disc {

	private int size;
	Tower tower = new Tower(1);
	
	public Disc(int num)
	{
		size = num;
	}
	public boolean canBePlaced(Disc d)
	{
		if(this.getSize()>d.getSize())
			return false;
		else return true;
	}
	public boolean moveDisc(Tower t)
	{
		if((t.getPosition()>3) || (t.getPosition()<1))
			return false;
		if(this.canBePlaced(t.getTopDisc()))
			this.setTower(t);
		return true;
	}
	public void setTower(Tower t)
	{
		tower = t;
		t.addDisc(this);
		
	}
	public int getSize()
	{
		return size;
	}
	
}

Tower

package com.camdroid.towers;

import java.util.ArrayList;

public class Tower {

	private int position;
	private ArrayList<Disc> discs = new ArrayList<Disc>();
	
	public Tower(int num)
	{
		position = num;
	}
	public int getPosition()
	{
		return position;
	}
	public void addDisc(Disc d)
	{
		discs.add(d);
	}
	public Disc getTopDisc()
	{
		return discs.get(0);
	}
	public String listDiscs()
	{
		String s="";
		int n=0;
//		if(discs.size()==0)
//			s=""+discs.size();
		
		for(int i=0; i<discs.size();i++)
		{
			s += discs.get(i).getSize()+"\n";
		}
		if(discs.size() == 0)
			s=""+discs.size();
		return s;
			
	}
}