Randomly generated map

Randomly generated map

So this is my code for randomy generated map , basicly its only function right now is to check if the last generated map overlap with other existing maps, if it does it is supposed to repeat until he makes a map that wont overlap with others. But somehow he just ignores that, i tried debugging and evreything stuck for 6 hours with this problem. Any help or hint would be appreciated.
public void generateRooms(){
    roomList.clear();

    roomList.add(new Room(new Vector2f(0,0),map));

    for(int i=1; i < 10; i++){
        boolean col = false;
        Random randN = new Random();

        roomList.add(new Room(new Vector2f((randN.nextInt(80)-40)*50 ,(randN.nextInt(80)-40)*50),map));
        col = checkColision(roomList.get(i).hitbox);

        while(col == true){
            roomList.remove(i);

            Random randNew = new Random();
            roomList.add(new Room(new Vector2f((randNew.nextInt(80)-40)*50 ,(randNew.nextInt(80)-40)*50),map));
            col = checkColision(roomList.get(i).hitbox);
        }

    }


}

public boolean checkColision(Box hitbox){
    for(int i=0; i < roomList.size()-2; i++){
        if(roomList.get(i).hitbox.collide(hitbox)){
            System.out.println("It colided");  
            return true;
        }
    }

    return false;
}