窗口按钮与文件怎么连接

java中如何把窗体的文本框中输入的内容保存到.txt文件中去，不要用数据库。文件创建好后，不知怎么按钮连接。
package test1;
import java.io.*;

import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.GroupLayout;
import javax.swing.GroupLayout.Alignment;
import javax.swing.JTextField;
import javax.swing.JLabel;
import javax.swing.LayoutStyle.ComponentPlacement;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class AddCandidate {

private JFrame frame;
private JTextField textField;
private JTextField textField_1;

/**
 * Launch the application.
 */
public static void main(String[] args)throws IOException {
    String fileName = "Hello.txt"; 
    FileWriter writer = new FileWriter(fileName);
    writer.write ("01\n");
    writer.write ("月月");
    writer.close();
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                AddCandidate window = new AddCandidate();
                window.frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}

/**
 * Create the application.
 */

public AddCandidate() {
    initialize();

}

/**
 * Initialize the contents of the frame.
 */
 void initialize() {
    frame = new JFrame("输入选手数据");
    frame.setVisible(true);
    frame.setBounds(100, 100, 450, 300);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    
    JLabel lblNewLabel = new JLabel("请输入选手的编号");
    
    JLabel lblNewLabel_1 = new JLabel("请输入选手姓名");
    
    textField = new JTextField();
    textField.setColumns(10);
    
    
    textField_1 = new JTextField();
    textField_1.setColumns(10);
    
    JButton btnNewButton = new JButton("确认");
    btnNewButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            System.out.println("添加选手数据成功！"); 
        }
    });
    
    GroupLayout groupLayout = new GroupLayout(frame.getContentPane());
    groupLayout.setHorizontalGroup(
        groupLayout.createParallelGroup(Alignment.LEADING)
            .addGroup(groupLayout.createSequentialGroup()
                .addGap(64)
                .addGroup(groupLayout.createParallelGroup(Alignment.LEADING)
                    .addComponent(textField_1, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
                    .addComponent(textField, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
                    .addComponent(lblNewLabel_1, GroupLayout.PREFERRED_SIZE, 111, GroupLayout.PREFERRED_SIZE)
                    .addComponent(lblNewLabel, GroupLayout.PREFERRED_SIZE, 111, GroupLayout.PREFERRED_SIZE))
                .addContainerGap(261, Short.MAX_VALUE))
            .addGroup(Alignment.TRAILING, groupLayout.createSequentialGroup()
                .addContainerGap(268, Short.MAX_VALUE)
                .addComponent(btnNewButton, GroupLayout.PREFERRED_SIZE, 97, GroupLayout.PREFERRED_SIZE)
                .addGap(71))
    );
    groupLayout.setVerticalGroup(
        groupLayout.createParallelGroup(Alignment.LEADING)
            .addGroup(groupLayout.createSequentialGroup()
                .addGap(30)
                .addComponent(lblNewLabel, GroupLayout.PREFERRED_SIZE, 34, GroupLayout.PREFERRED_SIZE)
                .addGap(18)
                .addComponent(textField, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
                .addGap(14)
                .addComponent(lblNewLabel_1, GroupLayout.PREFERRED_SIZE, 34, GroupLayout.PREFERRED_SIZE)
                .addGap(26)
                .addComponent(textField_1, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(ComponentPlacement.RELATED)
                .addComponent(btnNewButton)
                .addContainerGap(36, Short.MAX_VALUE))
    );
    frame.getContentPane().setLayout(groupLayout);
}

}

你从工具箱里拖个按钮出来，双击，直接给你生成好按钮的回调事件函数
然后你在函数里写读取文本框，写入文件的代码

但是我需要保存这个数据，因为后面得查询它并且打分，如果直接在文本框里写文字，应该就不能在文件里查询了啊，仅仅是一个文本框。（不好意思，我没讲清楚）