java在函数类中使用接口

Question

这个程序完全按照我想要的方式运行。在Frompanel的底部，只有一行我看不懂。我刚从教程视频中学到这一点

这是我的界面

public interface StringListener {
    public void EmitText(String Text);
}

这是Formpanel类

public class FormPanel extends JPanel {

    StringListener txtListener;

    private String Name;
    private String Age;
    private String Address;


    private JTextField NameF;
    private JTextField AgeF;
    private JTextField AddressF;

    private JButton Ok;

    public FormPanel() {

        NameF = new JTextField(8);
        AgeF = new JTextField(8);
        AddressF = new JTextField(8);

        Ok = new JButton("Ok");
        setLayout(new GridBagLayout());

        Ok.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                Name = NameF.getText().toString();
                Age = AgeF.getText().toString();
                Address = AddressF.getText().toString();

                txtListener.EmitText("\n Hello! " + Name + "\n");
                txtListener.EmitText("you are " + Age + " years old \n");
                txtListener.EmitText("you lived in " + Address);

            }
        });
    }

    public void showInfo(StringListener Listener) {
        this.txtListener = Listener; /// I cant Understand this Line

    }
}

Answer 1

该行只是将txtListerner设置为给定的StringListener。你可能会感到困惑，因为你用大写L写了Listener