如何将JTextField组件保存在.txt文件中?(使用Netbeans GUI)

Question

这就是我现在所做的，我正在尝试做一个java项目，但我真的想看看一些例子来理解我实现它的方法。如果我想获取所有jtextfield组件并将其保存到文件中

    public class Lift extends javax.swing.JFrame {
        public Lift()
        {
            super("Lift Maintenance");
            initComponents();
        }

        @SuppressWarnings("unchecked")
        // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
        private void initComponents() {
            jLabel1 = new javax.swing.JLabel();
            jTextField1 = new javax.swing.JTextField();
            jLabel2 = new javax.swing.JLabel();
            jTextField2 = new javax.swing.JTextField();
            jLabel3 = new javax.swing.JLabel();
            jTextField3 = new javax.swing.JTextField();
            jButton1 = new javax.swing.JButton();
            jButton2 = new javax.swing.JButton();
            jButton3 = new javax.swing.JButton();
            jButton4 = new javax.swing.JButton();
            setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
            jLabel1.setText("Lift maintenance:");
            jLabel2.setText("Lift parts:");
            jLabel3.setText("Technician:");
            jButton1.setText("NEXT");
            jButton1.addActionListener(new java.awt.event.ActionListener() {
                public void actionPerformed(java.awt.event.ActionEvent evt) {
                    jButton1ActionPerformed(evt);
                }
            });
            jButton2.setText("BACK");
            jButton2.addActionListener(new java.awt.event.ActionListener() {
                public void actionPerformed(java.awt.event.ActionEvent evt) {
                    jButton2ActionPerformed(evt);
                }
            });
            jButton3.setText("CLEAR");
            jButton3.addActionListener(new java.awt.event.ActionListener() {
                public void actionPerformed(java.awt.event.ActionEvent evt) {
                    jButton3ActionPerformed(evt);
                }
            });
            jButton4.setText("EXIT");
            jButton4.addActionListener(new java.awt.event.ActionListener() {
                public void actionPerformed(java.awt.event.ActionEvent evt) {
                    jButton4ActionPerformed(evt);
                }
            });
            org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(getContentPane());
            getContentPane().setLayout(layout);
            layout.setHorizontalGroup(
                layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
                .add(layout.createSequentialGroup()
                    .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
                        .add(jLabel1)
                        .add(jLabel3)
                        .add(jLabel2))
                    .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
                    .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING, false)
                        .add(jTextField2)
                        .add(jTextField3)
                        .add(jTextField1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 83, Short.MAX_VALUE)))
                .add(layout.createSequentialGroup()
                    .add(jButton3)
                    .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
                    .add(jButton4)
                    .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
                    .add(jButton2, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 92, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                    .addPreferredGap(org.jdesktop.layout.LayoutStyle.UNRELATED)
                    .add(jButton1, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 101, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
            );
            layout.setVerticalGroup(
                layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
                .add(layout.createSequentialGroup()
                    .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
                        .add(jLabel1)
                        .add(jTextField1, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
                    .add(20, 20, 20)
                    .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
                        .add(jLabel2)
                        .add(jTextField2, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 32, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
                    .add(18, 18, 18)
                    .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
                        .add(jLabel3)
                        .add(jTextField3, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
                    .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED, 146, Short.MAX_VALUE)
                    .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
                        .add(jButton3)
                        .add(jButton4)
                        .add(jButton2)
                        .add(jButton1, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 29, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)))
            );
            pack();
        }// </editor-fold>                        
        private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {                                         
            jTextField1.setText("");
            jTextField2.setText("");
            jTextField3.setText("");
        }                                        
        private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
            this.dispose();
            coOwnerShip C=new coOwnerShip();
            C.setVisible(true);
        }                                        
        private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
           this.dispose();
           HeatingCost h=new HeatingCost();
           h.setVisible(true);
        }                                        
        private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {                                         
            System.exit(0);
        }                                        

        public static void main(String args[]) {
            java.awt.EventQueue.invokeLater(new Runnable() {
                public void run() {
                    new Lift().setVisible(true);
                }
            });
        }
        // Variables declaration - do not modify                     
        private javax.swing.JButton jButton1;
        private javax.swing.JButton jButton2;
        private javax.swing.JButton jButton3;
        private javax.swing.JButton jButton4;
        private javax.swing.JLabel jLabel1;
        private javax.swing.JLabel jLabel2;
        private javax.swing.JLabel jLabel3;
        private javax.swing.JTextField jTextField1;
        private javax.swing.JTextField jTextField2;
        private javax.swing.JTextField jTextField3;
        // End of variables declaration                   
    }

又上了一节课。。。。

    public class coOwnerShip extends javax.swing.JFrame {
        /** Creates new form coOwnerShip */
        public coOwnerShip()
        {
            super("Co=Ownership Cost");
            initComponents();
        }

        @SuppressWarnings("unchecked")
        // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
        private void initComponents() {
            jLabel1 = new javax.swing.JLabel();
            jTextField1 = new javax.swing.JTextField();
            jLabel2 = new javax.swing.JLabel();
            jTextField2 = new javax.swing.JTextField();
            jButton1 = new javax.swing.JButton();
            jButton2 = new javax.swing.JButton();
            jButton3 = new javax.swing.JButton();
            jButton4 = new javax.swing.JButton();
            setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
            jLabel1.setText("Taxis:");
            jLabel2.setText("Co-Ownership cost:");
            jButton1.setText("NEXT");
            jButton1.addActionListener(new java.awt.event.ActionListener() {
                public void actionPerformed(java.awt.event.ActionEvent evt) {
                    jButton1ActionPerformed(evt);
                }
            });
            jButton2.setText("BACK");
            jButton2.addActionListener(new java.awt.event.ActionListener() {
                public void actionPerformed(java.awt.event.ActionEvent evt) {
                    jButton2ActionPerformed(evt);
                }
            });
            jButton3.setText("CLEAR");
            jButton3.addActionListener(new java.awt.event.ActionListener() {
                public void actionPerformed(java.awt.event.ActionEvent evt) {
                    jButton3ActionPerformed(evt);
                }
            });
            jButton4.setText("EXIT");
            jButton4.addActionListener(new java.awt.event.ActionListener() {
                public void actionPerformed(java.awt.event.ActionEvent evt) {
                    jButton4ActionPerformed(evt);
                }
            });
            org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(getContentPane());
            getContentPane().setLayout(layout);
            layout.setHorizontalGroup(
                layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
                .add(layout.createSequentialGroup()
                    .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
                        .add(jLabel2)
                        .add(jLabel1)
                        .add(layout.createSequentialGroup()
                            .add(jButton3)
                            .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
                            .add(jButton4)))
                    .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
                    .add(jButton2)
                    .add(9, 9, 9)
                    .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.TRAILING)
                        .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING, false)
                            .add(jTextField2)
                            .add(jTextField1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 82, Short.MAX_VALUE))
                        .add(jButton1))
                    .addContainerGap(org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
            );
            layout.setVerticalGroup(
                layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
                .add(layout.createSequentialGroup()
                    .add(40, 40, 40)
                    .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
                        .add(jLabel1)
                        .add(jTextField1, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
                    .addPreferredGap(org.jdesktop.layout.LayoutStyle.UNRELATED)
                    .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
                        .add(jLabel2)
                        .add(jTextField2, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 22, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
                    .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED, 199, Short.MAX_VALUE)
                    .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
                        .add(jButton3)
                        .add(jButton4)
                        .add(jButton2)
                        .add(jButton1)))
            );
            pack();
        }// </editor-fold>                        
        private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
            this.dispose();
            BuildingCostOutputStream b=new BuildingCostOutputStream();
            b.setVisible(true);
        }                                        
        private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {                                         
            jTextField1.setText("");
            jTextField2.setText("");
        }                                        
        private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
            this.dispose();
            Lift l=new Lift();
            l.setVisible(true);
        }                                        
        private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {                                         
            System.exit(0);
        }                                        

        public static void main(String args[]) {
            java.awt.EventQueue.invokeLater(new Runnable() {
                public void run() {
                    new coOwnerShip().setVisible(true);
                }
            });
        }
        // Variables declaration - do not modify                     
        private javax.swing.JButton jButton1;
        private javax.swing.JButton jButton2;
        private javax.swing.JButton jButton3;
        private javax.swing.JButton jButton4;
        private javax.swing.JLabel jLabel1;
        private javax.swing.JLabel jLabel2;
        private javax.swing.JTextField jTextField1;
        private javax.swing.JTextField jTextField2;
        // End of variables declaration                   
    }

下面是第二个JFrame类。。。

    public class BuildingCostOutputStream extends javax.swing.JFrame {

        public BuildingCostOutputStream()
        {
            super("Building Output Stream");
            initComponents();
        }

        @SuppressWarnings("unchecked")
        // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
        private void initComponents() {
            jLabel1 = new javax.swing.JLabel();
            jLabel2 = new javax.swing.JLabel();
            jTextField1 = new javax.swing.JTextField();
            jPasswordField1 = new javax.swing.JPasswordField();
            jLabel3 = new javax.swing.JLabel();
            jTextField2 = new javax.swing.JTextField();
            jLabel4 = new javax.swing.JLabel();
            jLabel5 = new javax.swing.JLabel();
            jTextField3 = new javax.swing.JTextField();
            jTextField4 = new javax.swing.JTextField();
            jLabel6 = new javax.swing.JLabel();
            jTextField5 = new javax.swing.JTextField();
            jLabel7 = new javax.swing.JLabel();
            jTextField6 = new javax.swing.JTextField();
            jLabel8 = new javax.swing.JLabel();
            jTextField7 = new javax.swing.JTextField();
            jButton1 = new javax.swing.JButton();
            jButton2 = new javax.swing.JButton();
            jButton3 = new javax.swing.JButton();
            jButton4 = new javax.swing.JButton();
            jButton5 = new javax.swing.JButton();
            setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
            jLabel1.setText("Username:");
            jLabel2.setText("PassWord:");
            jLabel3.setText("Building Code:");
            jLabel4.setText("Month:");
            jLabel5.setText("Year:");
            jLabel6.setText("Maintenance Cost:");
            jLabel7.setText("Heating Cost:");
            jLabel8.setText("Co-Ownership Cost:");
            jTextField7.addActionListener(new java.awt.event.ActionListener() {
                public void actionPerformed(java.awt.event.ActionEvent evt) {
                    jTextField7ActionPerformed(evt);
                }
            });
            jButton1.setText("NEXT");
            jButton2.setText("SAVE");
            jButton3.setText("BACK");
            jButton3.addActionListener(new java.awt.event.ActionListener() {
                public void actionPerformed(java.awt.event.ActionEvent evt) {
                    jButton3ActionPerformed(evt);
                }
            });
            jButton4.setText("CLEAR");
            jButton4.addActionListener(new java.awt.event.ActionListener() {
                public void actionPerformed(java.awt.event.ActionEvent evt) {
                    jButton4ActionPerformed(evt);
                }
            });
            jButton5.setText("EXIT");
            jButton5.addActionListener(new java.awt.event.ActionListener() {
                public void actionPerformed(java.awt.event.ActionEvent evt) {
                    jButton5ActionPerformed(evt);
                }
            });
            org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(getContentPane());
            getContentPane().setLayout(layout);
            layout.setHorizontalGroup(
                layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
                .add(layout.createSequentialGroup()
                    .add(163, 163, 163)
                    .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.TRAILING)
                        .add(org.jdesktop.layout.GroupLayout.LEADING, layout.createSequentialGroup()
                            .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
                                .add(jLabel1)
                                .add(jLabel2))
                            .add(34, 34, 34)
                            .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.TRAILING)
                                .add(jTextField1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 389, Short.MAX_VALUE)
                                .add(org.jdesktop.layout.GroupLayout.LEADING, jPasswordField1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 389, Short.MAX_VALUE)))
                        .add(layout.createSequentialGroup()
                            .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
                                .add(jLabel3)
                                .add(jLabel4)
                                .add(jLabel6)
                                .add(jLabel7)
                                .add(jLabel8))
                            .add(21, 21, 21)
                            .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.TRAILING)
                                .add(org.jdesktop.layout.GroupLayout.LEADING, jTextField2, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 204, Short.MAX_VALUE)
                                .add(org.jdesktop.layout.GroupLayout.LEADING, layout.createSequentialGroup()
                                    .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.TRAILING)
                                        .add(org.jdesktop.layout.GroupLayout.LEADING, jTextField5, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 98, Short.MAX_VALUE)
                                        .add(org.jdesktop.layout.GroupLayout.LEADING, jTextField3, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 98, Short.MAX_VALUE)
                                        .add(org.jdesktop.layout.GroupLayout.LEADING, jTextField6, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 98, Short.MAX_VALUE)
                                        .add(org.jdesktop.layout.GroupLayout.LEADING, jTextField7, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 98, Short.MAX_VALUE))
                                    .add(106, 106, 106)))
                            .add(1, 1, 1)
                            .add(jLabel5)
                            .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
                            .add(jTextField4, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 73, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                            .addContainerGap())
                        .add(layout.createSequentialGroup()
                            .add(jButton4)
                            .addPreferredGap(org.jdesktop.layout.LayoutStyle.UNRELATED)
                            .add(jButton5)
                            .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
                            .add(jButton2)
                            .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
                            .add(jButton3)
                            .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
                            .add(jButton1))))
            );
            layout.setVerticalGroup(
                layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
                .add(layout.createSequentialGroup()
                    .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
                        .add(jLabel1)
                        .add(jTextField1, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 22, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
                    .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
                    .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
                        .add(jPasswordField1, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 28, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                        .add(jLabel2))
                    .add(14, 14, 14)
                    .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.TRAILING)
                        .add(jLabel3)
                        .add(jTextField2, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
                    .add(18, 18, 18)
                    .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.TRAILING)
                        .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
                            .add(jTextField4, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 28, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                            .add(jLabel5)
                            .add(jLabel4))
                        .add(jTextField3, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 28, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
                    .add(18, 18, 18)
                    .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
                        .add(jLabel6)
                        .add(jTextField5, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
                    .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
                    .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
                        .add(jLabel7)
                        .add(jTextField6, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 22, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
                    .add(30, 30, 30)
                    .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
                        .add(jLabel8)
                        .add(jTextField7, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
                    .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED, 107, Short.MAX_VALUE)
                    .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
                        .add(jButton1)
                        .add(jButton5)
                        .add(jButton4)
                        .add(jButton3)
                        .add(jButton2)))
            );
            pack();
        }// </editor-fold>                        
        private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {                                         
            jTextField1.setText("");
            jTextField2.setText("");
            jTextField3.setText("");
            jTextField4.setText("");
            jTextField5.setText("");
            jTextField6.setText("");
            jTextField7.setText("");
        }                                        
        private void jTextField7ActionPerformed(java.awt.event.ActionEvent evt) {                                            
            // TODO add your handling code here:
        }                                           
        private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {                                         
            this.dispose();
            coOwnerShip C=new coOwnerShip();
            C.setVisible(true);
        }                                        
        private void jButton5ActionPerformed(java.awt.event.ActionEvent evt) {                                         
           System.exit(0);
        }                                        

        public static void main(String args[]) {
            java.awt.EventQueue.invokeLater(new Runnable() {
                public void run() {
                    new BuildingCostOutputStream().setVisible(true);
                }
            });
        }
        // Variables declaration - do not modify                     
        private javax.swing.JButton jButton1;
        private javax.swing.JButton jButton2;
        private javax.swing.JButton jButton3;
        private javax.swing.JButton jButton4;
        private javax.swing.JButton jButton5;
        private javax.swing.JLabel jLabel1;
        private javax.swing.JLabel jLabel2;
        private javax.swing.JLabel jLabel3;
        private javax.swing.JLabel jLabel4;
        private javax.swing.JLabel jLabel5;
        private javax.swing.JLabel jLabel6;
        private javax.swing.JLabel jLabel7;
        private javax.swing.JLabel jLabel8;
        private javax.swing.JPasswordField jPasswordField1;
        private javax.swing.JTextField jTextField1;
        private javax.swing.JTextField jTextField2;
        private javax.swing.JTextField jTextField3;
        private javax.swing.JTextField jTextField4;
        private javax.swing.JTextField jTextField5;
        private javax.swing.JTextField jTextField6;
        private javax.swing.JTextField jTextField7;
        // End of variables declaration                   
    }

Answer 1

我们需要做的第一件事是从JTextField中获取文本并将其存储在String中，如下所示：

String textFieldVal = yourTextField.getText();

然后，我们必须将值写入一个文本文件，如下所示：

PrintWriter writer = new PrintWriter("textFieldOutput.txt", "UTF-8");
writer.println(textFieldVal);
writer.close();

所以，这就是你第一堂课上的样子：

String textField1Val = jTextField1.getText();
String textField2Val = jTextField2.getText();
String textField3Val = jTextField3.getText();
String textField4Val = jTextField4.getText();
String textField5Val = jTextField5.getText();
String textField6Val = jTextField6.getText();
String textField7Val = jTextField7.getText();

当你想把它保存到一个文本文件时：

PrintWriter writer = new PrintWriter("textFieldOutput.txt", "UTF-8");
writer.println("First text field:");
writer.println(textField1Val);
writer.println("Second text field:");
writer.println(textField2Val);
writer.println("Third text field:");
writer.println(textField3Val);
writer.println("Fourth text field:");
writer.println(textField4Val);
writer.println("Fifth text field:");
writer.println(textField5Val);
writer.println("Sixth text field:");
writer.println(textField6Val);
writer.println("Seventh text field:");
writer.println(textField7Val);
writer.close();

然而，如果文件已经存在，这将覆盖它，所以在其他类中，这样做：

try (PrintWriter writer = new PrintWriter(new BufferedWriter(new FileWriter("textFieldOutput.txt", true)))) {
writer.println(textField1Val);
writer.println(textField2Val);
// etc...
} catch (IOException e) {
}

这样，它将添加到文件中，而不是删除所有文本。我希望这能有所帮助！

编辑：

以下是一个示例ActionListener，它引用了一个包含所有代码的空区：

jTextField1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                saveText(evt);
            }
        });

还有你班上的其他地方：

private void saveText(evt) {
    String textField1Val = jTextField1.getText();
    String textField2Val = jTextField2.getText();
    String textField3Val = jTextField3.getText();
    String textField4Val = jTextField4.getText();
    String textField5Val = jTextField5.getText();
    String textField6Val = jTextField6.getText();
    String textField7Val = jTextField7.getText();
    PrintWriter writer = new PrintWriter("textFieldOutput.txt", "UTF-8");
    writer.println("First text field:");
    writer.println(textField1Val);
    writer.println("Second text field:");
    writer.println(textField2Val);
    writer.println("Third text field:");
    writer.println(textField3Val);
    writer.println("Fourth text field:");
    writer.println(textField4Val);
    writer.println("Fifth text field:");
    writer.println(textField5Val);
    writer.println("Sixth text field:");
    writer.println(textField6Val);
    writer.println("Seventh text field:");
    writer.println(textField7Val);
    writer.close();
}