java - 将ActionListener从另一个类添加到JButton

所以我有两个类testPanel和testFrame。所有按钮都在testPanel类中。我想将ActionListeners添加到testFrame类的Jbuttons中。我该怎么做呢？

testPanel：

public class testPanel extends JPanel{

JLabel codeLbl = new JLabel("Code");
JLabel titleLbl = new JLabel("Title");
JLabel priceLbl = new JLabel("Price");

JTextField codeTxt = new JTextField(20);
JTextField titleTxt = new JTextField(20);
JTextField priceTxt = new JTextField(20);

JButton addBtn = new JButton("Add");
JButton updateBtn = new JButton("Update");
JButton delBtn = new JButton("Delete");
JButton exitBtn = new JButton("Exit");
JButton firstBtn = new JButton("First");
JButton prevBtn = new JButton("Previous");
JButton nextBtn = new JButton("Next");
JButton lastBtn = new JButton("Last");

JPanel info = new JPanel();
JPanel buttons = new JPanel();

public testPanel(){
    info.setLayout(new GridLayout(3,2));

    info.add(codeLbl);
    info.add(codeTxt);
    info.add(titleLbl);
    info.add(titleTxt);
    info.add(priceLbl);
    info.add(priceTxt);

    buttons.setLayout(new GridLayout(2,4));

    buttons.add(addBtn);
    buttons.add(updateBtn);
    buttons.add(delBtn);
    buttons.add(exitBtn);
    buttons.add(firstBtn);
    buttons.add(prevBtn);
    buttons.add(nextBtn);
    buttons.add(lastBtn);

    JPanel container = new JPanel();
    container.setLayout(new BorderLayout());

    container.add(BorderLayout.CENTER, info);
    container.add(BorderLayout.SOUTH, buttons);

    add(container);
}
}

testFrame：

 public class testFrame extends JFrame{
JPanel p = new testPanel();

public testFrame(){
    super("BLAH");

    this.getContentPane().add(p);setVisible(true);
    pack();
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

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

}

最佳答案

首先，我反对仅向面板中的按钮提供公共访问权限，这会导致管理和责任范围过多的问题……恕我直言

您需要对testPane的某种引用，然后该引用将提供附加ActionListener的功能。然后由testPane管理如何完成。