Java子对象运行Parent Object的方法

Question

I decided using BorderLayout for swing design named Loginwards. And I wrote 5 Classes for 5 side of BorderLayout as PageStart, LineStart, Center, LineEnd, PageEnd.

I have undecorated Loginwards and designed PageStart for use minimize,resize,quit.(for my own images, rules...) button quit is simple because it have worked like this

button.addActionListener(new ActionListener() {
    @Override
        public void actionPerformed(ActionEvent arg0) {
            System.exit(0);

        }
    });

but for example minimize I could not solve. I should have changed my Loginwards properties from another class object

Sum up

public class Loginwards extends Jframe
{   ...
    JFrame frame = new JFrame("BorderLayoutDemo");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.add(PageStart.Panel(), BorderLayout.PAGE_START);
    ...
}


public class PageStart{
   public static JPanel Panel(){
     JPanel panel = new JPanel();
     FlowLayout pagestart = new FlowLayout(FlowLayout.RIGHT);
     panel.setLayout(pagestart);
     panel.add(MinimizeButton()); 
     panel.add(ResizeButton()); 
     panel.add(QuitButton()); 
   }
   public static JButton MinimizeButton(){
    JButton button = new JButton();
    button.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent arg0) {
        // I Should be able to reach Loginwards here.
        }
    });
    return button;
}

Answer 1

MinimizeButton is a static method, so pass Loginwards instance as it's parameter, then make use of it in your listener:

public static JButton MinimizeButton(Loginwards loginwards){
    JButton button = new JButton();
    button.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent arg0) {
            // Invoke whatever you need on Loginwards...
            loginwards.doSomething();
        }
    });
    return button;
}

Btw, method names should start with lowercase... see naming conventions for Java