How to make "Levels" in simple java game

Question

I just wanted to know if anybody knew how to make "Levels" in a java game. In my case, it is to change two polygons that are used in the background. I think you have to use an array of some kind, but i dont really know.
Here is my source, the polygons are by the massive ///////// areas.
I cut out the majority of the program, because it was too long.
public class collision extends Applet implements MouseListener,MouseMotionListener
    private  Image rickImage,mazeImage;
   Image Buffer;
   Graphics gBuffer;
   int x, y;
   int[] LeftWallX = {0,204,204,149,149,162,162,243,260,235,259,232,260,230,207,207,0};
   int[] LeftWallY = {500,499,402,402,341,324,227,191,157,141,135,123,116,109,86,1,1};
   //int[] PlayAreaX = {204,204,149,149,162,162,243,260,235,259,232,260,230,207,207,263,263,245,282,262,274,257,273,250,184,184,170,170,208,216,216};
  // int[] PlayAreaY = {499,402,402,341,324,227,191,157,141,135,123,116,109,86,1,1,86,103,115,129,138,147,155,201,230,323,340,384,384,402,499};
   int[] RightWallX = {500,500,263,263,245,282,262,274,257,273,250,184,184,170,170,208,216,216};
   int[] RightWallY = {500,0,1,86,103,115,129,138,147,155,201,230,323,340,384,384,402,499};
   boolean mouseInside, collide;
   boolean rolled = false;
   boolean msg = true;
   int sX=204,sY=490,sW=12,sH=9;
   //Declare the rectangles
   Rectangle  movingRect,finshBloc,startBloc,oopsBloc;
   //Declare the polygons
   Polygon leftWall,playerArea,rightWall;
        ///Initiate
        public void init()
             rickImage = getImage(getDocumentBase(), "rick.jpg");
             mazeImage = getImage(getDocumentBase(), "maze1.jpg");
             collide=false;
             Buffer=createImage(getSize().width,getSize().height);
             gBuffer=Buffer.getGraphics();
             rightWall=new Polygon(RightWallX,RightWallY,18);
             playerArea= new Polygon(PlayAreaX,PlayAreaY,31);
             leftWall= new Polygon(LeftWallX,LeftWallY,17);
        public void paint(Graphics g)
             drawStuff();
             g.drawImage (Buffer,0,0, this);
*/

Answer 1

I'm not exactly sure in your case what you are trying to accomplish. If all you want to do is make new polygons for your levels then you will simply need a Vector of type level (or polygon). Store multiple levels/polygons in that vector. This can be done many ways, probably the most efficient way would be to create a class Level of sorts and create each level object from there. This way you have all your levels stored into that vector.
I have made programs where the levels/mazes are randomly generated based on certain parameters (this way you would not need to define any specific level). This can be done inside the Level class and added to the vector so that when a level is randomly generated there are literally infinite possibilities. I would suggest posting all your code or at least a breakdown UML diagram of what is going on in your entire program.