boolean not changing

public class RoomButton extends Buttons
{
    public Room room; //i know you didnt say to add this, but it was the only way that it would stop saying "room" is an undeclared variable
    /**
     * Act - do whatever the RoomButton wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    public void act()
    {
        change();
    }
    public void change()
    {
        if(Greenfoot.mouseClicked(this))
        {
            Greenfoot.setWorld(room);
        }
    }
    public RoomButton()
    {
        
    }
}

public class Dock extends World
{
    

    public int timer=0;
    
  
    public boolean baitNo=true; 
    public boolean rodNo=true;
    
    public boolean baitLow=false;
    public boolean rodLow=false;
    
    public boolean baitMed=false;
    public boolean rodMed=false;
    public boolean baitHigh=false;
    public boolean rodHigh=false;

    public Shop shop;
    public Room room;
    /**
     * Constructor for objects of class Dock.
     * 
     */
    public Dock()
    {    
        // Create a new world with 600x400 cells with a cell size of 1x1 pixels.
        super(600,400,1);
        setBackground(new GreenfootImage("dockbg.png"));
        prepare();
        shop = new Shop();
        room = new Room();
        RoomButton roomButton = new RoomButton();
        addObject(roomButton,34,305);
        
        Greenfoot.start();
    }

public class RoomButton extends Buttons
{
    private Dock dock;
    
    public RoomButton(Dock _dock) {
        dock = _dock;
    }
    
    public void act() {
        change();
    }
    
    public void change() {
        if (Greenfoot.mouseClicked(this)) {
            Greenfoot.setWorld(dock.room);
        }
    }
}

/**   In Dock class  */
RoomButton roomButton = new RoomButton(this);

/**  In Shop class  */
RoomButton roomButton = new RoomButton(dock);

public class RoomButton extends Buttons
{
    private Dock dock;
    /**
     * Act - do whatever the RoomButton wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    public void act()
    {
        change();
    }
    public void change()
    {
        if(Greenfoot.mouseClicked(this)) && (World instanceof Dock) //i dont know exactly how to word or use this or if its even correct, ive never used instanceof before
        {
            Greenfoot.setWorld(dock.room);
        }
else if(Greenfoot.mouseClicked(this)) && (World instanceof Shop)
{
 Greenfoot.setWorld(new Shop()); //if its slightly mistyped, ignore it, i dont have it exactly memorized
}
    }
    public RoomButton(Dock _dock)
    {
        dock = _dock;
    }
}

getWorld()==Dock

public class RoomButton extends Buttons
{
    private Dock dock;
    /**
     * Act - do whatever the RoomButton wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    public void act()
    {
        change();
    }
    public void change()
    {
        if(Greenfoot.mouseClicked(this) && (getWorld() instanceof Dock))
        {
            Greenfoot.setWorld(dock.room);
        }
        if (Greenfoot.mouseClicked(this) && (getWorld() instanceof Shop))
        {
            Greenfoot.setWorld(new Shop());
        }
    }
    public RoomButton(Dock _dock)
    {
        dock = _dock;
    }
}

public class ShopButton extends Buttons
{
    private Dock dock;
    /**
     * Act - do whatever the ShopButton wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    public void act()
    {
        change();
    }
    public void change()
    {
        if(Greenfoot.mouseClicked(this)  && (getWorld() instanceof Dock))
        {
            Greenfoot.setWorld(dock.shop);
        }
        else if (Greenfoot.mouseClicked(this) && (getWorld() instanceof Room))
        {
            Greenfoot.setWorld(new Shop());
        }
    }
    public ShopButton(Dock _dock)
    {
        dock = _dock;
    }
}

private Dock dock;
    /**
     * Act - do whatever the DockButton wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    public void act()
    {
        change();
    }
    public void change()
    {
        if(Greenfoot.mouseClicked(this) && getWorld() instanceof Dock) 
        {
            Greenfoot.setWorld(dock);  
        }
        else if (Greenfoot.mouseClicked(this) && getWorld() instanceof Shop)
        {
            Greenfoot.setWorld(dock.dock);
        }
    }
    public DockButton(Dock _dock)
    {
        dock = _dock;
    }

public void change() {
    if (Greenfoot.mouseClicked(this)) Greenfoot.setWorld(dock.dock);
}

public void change() {
    if (Greenfoot.mouseClicked(this)) Greenfoot.setWorld(dock.room);
}

public void change() {
    if (Greenfoot.mouseCLicked(this)) Greenfoot.setWorld(dock.shop);
}

import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)

/**
 * Write a description of class DockButton here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class DockButton extends Buttons
{
    private Dock dock;
    /**
     * Act - do whatever the DockButton wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    public void act()
    {
        change();
    }
    public void change()
    {
        if(Greenfoot.mouseClicked(this) && getWorld() instanceof Dock) 
        {
            Greenfoot.setWorld(dock);  
        }
        else if (Greenfoot.mouseClicked(this) && getWorld() instanceof Shop && (getWorld()!=null))
        {
            Greenfoot.setWorld(dock.dock);
        }
    }
    public DockButton(Dock _dock)
    {
        dock = _dock;
    }
}

Greenfoot.setWorld(Dock.dock);