setSize() method

I am facing an issue using setSize() method in the below program.

Error : The method setSize(int,int) is not defined for the type frame.

When I see Java API, "Class Frame" has this Method inherited from class java.awt.Window. As i have instantiated the Frame class, this object should have setSize() method as Frame is derived class of Window. Why am I getting this error then? How can a derived class doesnt contain its superclass method?

public class AwtPrac{

  public static void main(String[] args) {
    Frame fm = new Frame("Java Programm");
    Button b= new Button ("Click Here");
    fm.add(b);
    fm.setVisible(true);
    fm.SetSize(300,300);
    fm.dispose();
  }
}

---

拿这个代码

   import java.awt.Frame;

  public class AwtPrac  {

private static  void init(){
    Frame fm = new Frame("Java Programm");
   fm.setTitle("AwtPrac");
   fm.setSize(300,300);
    fm.setVisible(true);
}

public static void main(String[] args) {
    init();
}

}

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