State Management - [Switching States, Replaying the Game]

Question

How to effectively switch states?Whenever I press the replay button, the two states shows alternatively (win & play). I believe that was an infinite loop but Eclipse does not print any errors.

When I tried this, it results to null.Thus, ending the game. Could this be the answer? But I don't understand his Update(). What to put exactly there?will that overwrite the update of the state class?

Here is my code: stateID(2) is the Wins.java

PlayGround.java

   public static boolean bouncy = true;   
   public void update(GameContainer gc, StateBasedGame sbg, int delta) throws            SlickException{
             //if the user is successful, show winner state
            if(!bouncy){
                sbg.enterState(2);
            }
           //moves the image randomly in the screen
        new Timer(10,new ActionListener(){
              public void actionPerformed(ActionEvent e)
              {
                  posX = (r.nextInt(TestProject4.appGC.getWidth()-75));
                  posY = (r.nextInt(TestProject4.appGC.getHeight()-75));
              }
         }).start();


    }          
    public void mousePressed(int button,int x,int y){
         //if the user pressed the mouse button And
         //if the user's coordinates is inside the hit area(rect)
        if((button == 0) && (rect.contains(x, y))){
            Toolkit.getDefaultToolkit().beep();
              bouncy = false;
        }
    }

---

Wins.java

    @Override
public void update(GameContainer gc, StateBasedGame sbg, int delta)throws SlickException {
    //replay game
    if(backToGame == true){
        sbg.enterState(state);
    }
}

public void mousePressed(int button,int x,int y){
     //if the user clicks the replay button
    if(button == 0){        
      if((x>160 && x<260)&&(y>280 && y<320)){
             if(Mouse.isButtonDown(0)){
                    backToGame = true;                      
                    state = 1;
             }
          }

          //exit button
          if((x>=360 && x<460)&&(y>280 && y<320)){
             if(Mouse.isButtonDown(0)){
                System.exit(0);
          }
       }
    }
}

Answer 1

I think you switch between both states again and again because both GameState objects are still in the same "state" (variables have still the same values) when you switch back.

Try:

if(!bouncy){
  bouncy = true; // next time we are in this game state it will not trigger immediately
  sbg.enterState(2);
}

if(backToGame == true){
  backToGame = false; // same here 
  sbg.enterState(state);
}

---

Previous answer:

Please check your if statement:

  if((x>160 && x<180)||(y>280 && y<320)){

You are checking whether the mouse is between some x coordinates OR some y coordinates.

I think you want to check whether the mouse is between some x AND some y coordinates:

  if((x>160 && x<180)&&(y>280 && y<320)){