组合设计模式编写程序

public interface IForm {
    public void print();
}

public abstract class AbstractForm implements IForm {
    private String label;
    public AbstractForm(String _label){
        this.label = _label;
    }
    
    public void print() {
        System.out.println("print " + this.getClass().getSimpleName() + "(" + getLabel() + ")");
    }
    
    public String getLabel(){
        return this.label;
    }
}

public class Frame extends AbstractForm {
    private Vector<IForm> vector = new Vector<IForm>();
    public Frame(String _label){
        super(_label);
    }
    @Override
    public void print() {
        super.print();
        for (IForm iform:
             vector) {
            iform.print();
        }
    }
    
    public void add (IForm form){
        vector.add(form);
    }
}

public class WinForm extends Frame {
    private static String STATIC_WINDOW_FORM_LABEL = "WINDOW窗口";
    public WinForm(){
        this(STATIC_WINDOW_FORM_LABEL);
    }
    public WinForm(String _label) {
        super(_label);
    }
}