UML类图

public class LoginForm{
 private JButton loginButton ;
}
public class JButton{
}

public class ClassRoom{
    private Teacher teacher;
    public ClassRoom(Teacher teacher){
    this.teacher=teacher;
   }
}
public class Teacher {
   public string Name{get;set;}
   public int Age{get;set;}
}

public class Car{
    private Wheel wheel;
    public Car(){
        wheel=new Wheel();
    }
}

public class Wheel {
}