如何使用java swing在GUI中创建提交按钮

Question

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class FileChoose extends JPanel {
    private String textFieldLabel;
    private String buttonLabel;

    private JLabel label;
    private JTextField textField;
    private JButton button;

    private JFileChooser fileChooser;

    private int mode;
    public static final int MODE_OPEN = 1;
    public static final int MODE_SAVE = 2;

    public FileChoose(String textFieldLabel, String buttonLabel) {
        this.textFieldLabel = textFieldLabel;
        this.buttonLabel = buttonLabel;

        fileChooser = new JFileChooser();

        setLayout(new FlowLayout(FlowLayout.CENTER, 5, 5));

        // creates the GUI
        label = new JLabel(textFieldLabel);

        textField = new JTextField(30);
        button = new JButton(buttonLabel);

        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent evt) {
                buttonActionPerformed(evt);            
            }
        });

        add(label);
        add(textField);
        add(button);

    }

    private void buttonActionPerformed(ActionEvent evt) {
        if (mode == MODE_OPEN) {
            if (fileChooser.showOpenDialog(this) == JFileChooser.APPROVE_OPTION) {
                textField.setText(fileChooser.getSelectedFile().getAbsolutePath());
            }
        } else if (mode == MODE_SAVE) {
            if (fileChooser.showSaveDialog(this) == JFileChooser.APPROVE_OPTION) {
                textField.setText(fileChooser.getSelectedFile().getAbsolutePath());
            }
        }
    }

    /*public void addFileTypeFilter(String extension, String description) {
        FileTypeFilter filter = new FileTypeFilter(extension, description);
        fileChooser.addChoosableFileFilter(filter);
    }*/

    public void setMode(int mode) {
        this.mode = mode;
    }

    public String getSelectedFilePath() {
        return textField.getText();
    }

    public JFileChooser getFileChooser() {
        return this.fileChooser;
    }
}

我有上面的代码，在执行时会显示一个GUI来浏览和选择一个文件。除此之外，我想添加一个额外的按钮作为＆＃34;提交＆＃34;。由于我是新手，我不知道如何添加按钮。请帮帮我。