如何从另一个类访问变量getter和setter

I have 3 classes

我有3节课

public class GameInfo 
{
  private  int num;
  public void setNum(int num){
         this.num=num;
    }
  public int getNum(){
         return num; 
   }
}

public class NewGame
{ 
  public void foo(){
    GameInfo g = new GameInfo();
    g.setNum(10);
}
}

public class StartGame()
{
   //i want to access the num in GameInfo being set by NewGame class. How to do that? 

}
public class GameInf