public class Blastoise_Selection_CPU extends Blastoise_Selection
{
    private boolean CPU;
    /**
     * Act - do whatever the Charizard_Selection_CPU wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    public void act() 
    {
        if(Greenfoot.mouseClicked(this) && CPU == true)
        {
            World battle = new BattlePage();
            battle.addObject(this,300,200);
        }
    }

public class Blastoise_Selection_CPU extends Blastoise_Selection
{
    private boolean CPU;
    /**
     * Act - do whatever the Charizard_Selection_CPU wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    public void act() 
    {
        if(Greenfoot.mouseClicked(this) && CPU == true)
        {
            World battle = new BattlePage();
            battle.addObject(this,300,200);
        }
    }

public selectionPage()
    {    
        // Create a new world with 600x400 cells with a cell size of 1x1 pixels.
        super(600, 400, 1);
        setBackground("selectionBackground.jpg");
        
        Actor playerSelect = new playerSelect();
        addObject(playerSelect, 250, 25);
        
        Actor p1_CPU = new selection();
        addObject(p1_CPU, 250, 55);
        
        Actor charizard1 = new Charizard_Selection();
        addObject(charizard1,175,125);
        
        Actor charizard2 = new Charizard_Selection_CPU();
        addObject (charizard2,375, 125);
        
        Actor venusaur1 = new Venusaur_Selection();
        addObject(venusaur1, 175, 235);
        
        Actor venusaur2 = new Venusaur_Selection_CPU();
        addObject(venusaur2, 375, 235);
        
        Actor blastoise1 = new Blastoise_Selection();
        addObject(blastoise1, 175, 345);
        
        Actor blastoise2 = new Blastoise_Selection_CPU();
        addObject(blastoise2, 375, 345);
        
        Actor selectStart = new selectStartButton();
        addObject(selectStart, 500, 345);
    }

public class BattlePage extends World
{

    /**
     * Constructor for objects of class BattlePage.
     * 
     */
    public BattlePage()
    {    
        // Create a new world with 600x400 cells with a cell size of 1x1 pixels.
        super(600, 400, 1);
        setBackground("battle_background.jpg");
    }
}

public class selectStartButton extends startButton
{
    /**
     * Act - do whatever the selectStartButton wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    public void act() 
    {
        if(Greenfoot.mouseClicked(this))
        {
           Greenfoot.setWorld(new BattlePage()); 
        }
    }    
}