按照上面的链接，你可以添加一个动作监听器，如下所示。这个例子针对的是一个通用的ActionEvent，但是你也可以修改代码来处理其他类型的事件：

//The button to add an event to
JButton test = new JButton();

//The first option
test.addActionListener(new ActionListener(){
    public void actionPerformed(ActionEvent e){
        System.out.println("Action performed");
    }
});

//The second option. This only works on Java 8 and newer
test.addActionListener((ActionEvent e) ->
{
    System.out.println("Action performed");
});

//Or a simplified form for a single call
test.addActionListener(e -> System.out.println("Action performed"));

在您的案例中有一个工作示例：

public CustomComponent() {

    setLayout(new FlowLayout());
    add(button1);
    add(button2);

    button1.setSize(100, 30);
    button2.setSize(100, 30);

    //Add events
    button1.addActionListener(e -> System.out.println("Button 1 action performed"));
    button2.addActionListener(e -> System.out.println("Button 2 action performed"));
}

我没有通过构造函数传递侦听器，而是创建了另一个setter，因为GUI不支持它。

public void setListners(ActionListener btn1ActionListner, ActionListener btn2ActionListner){
        button1.addActionListener(btn1ActionListner);
        button2.addActionListener(btn2ActionListner);
    }

在另一个项目上

public NewJFrame() {
        initComponents();

        ActionListener al1 = new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                JOptionPane.showMessageDialog(null, "Button 1");
            }
        };

        ActionListener al2 = new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                JOptionPane.showMessageDialog(null, "Button 2");
            }
        };

        customComponent1.setListners(al1, al2);
    }