点击SAVE按钮后如何更新JTextfield [英] How to update JTextfield after click SAVE button

问题描述

我有一个主框架：JFrame> contentFrame> ScrollPane> BigPanel> panel_1T

  private JPanel contentPane; 
私人JPanel BigPanel; 
私人JPanel panel_1T; 
  

在panel_1T中，我已经放置了一个带有actionListener的食物按钮：

  JButton button_19 = new JButton（FOOD）; 
 button_19.addActionListener（new ActionListener（）{
 public void actionPerformed（ActionEvent ae）{
 
 newFoodUI nf = new newFoodUI（）; //打开其他类
 nf.setVisible（true）; 
 nf.setDefaultCloseOperation（WindowConstants.DISPOSE_ON_CLOSE）; 
 
} 
}）; 
 panel_1T.setLayout（new GridLayout（0，2，0，0））; 
 panel_1T.add（button_19）; 
  

当用户单击FOOD按钮时， newFoodUI中的新JFrame 类将显示：
JFrame> contentPane> panel> tabbedPane> panel_3> panel_5

在panel_5中，我放了一个JTextField：

  public static JTextField textField_3; 
 
 textField_3 = new JTextField（）; 
 panel_5.add（textField_3，9，4，fill，default）; 
 textField_3.setColumns（10）; 
  

用户将把一些文本写入 textField_3 。然后用户点击panel_3中的SAVE按钮，将执行以下操作：

  JButton button_4 = new JButton（SAVE）; 
 button_4.addActionListener（new ActionListener（）{
 public void actionPerformed（ActionEvent e）{
 
 setContentPane（contentPane）; 
 panel_3.revalidate（）; 
 panel_3.repaint（）; 
 panel_3.updateUI（）; 
 
 panel_5.revalidate（）; 
 panel_5.repaint（）; 
 panel_5.updateUI ）; 
 
 
 contentPane.revalidate（）; 
 contentPane.repaint（）; 
 
 JOptionPane.showMessageDialog（null，Saved！ 
 
} 
}）; 
 button_4.setBounds（873，396，75，33）; 
 contentPane.add（button_4）;结果是，当我点击保存按钮并关闭newFoodUI中的框架时，我将通过点击食物按钮重新打开，以检查我写的文本是否已保存。但它不保存我写的文本。 
解决方案
您必须保存textfeld中的值 textField_3.getText（）并在显示 textField_3.setText（value）时手动将此值设置为textfeld。所以你必须保持你的价值在你的项目或存储持久的某个地方。
 
I have a main frame : JFrame>contentFrame>ScrollPane>BigPanel>panel_1T
private JPanel contentPane;
private JPanel BigPanel;
private JPanel panel_1T;
In panel_1T, I have put a FOOD button WITH its actionListener:
JButton button_19 = new JButton("FOOD");
button_19.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent ae) {

            newFoodUI nf = new newFoodUI();//Open other class
            nf.setVisible(true);
            nf.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);      

                                                 }
                                               });
panel_1T.setLayout(new GridLayout(0, 2, 0, 0));
panel_1T.add(button_19);
When user click FOOD button, new JFrame in newFoodUI class will be shown.:
JFrame>contentPane>panel>tabbedPane>panel_3>panel_5

In panel_5, I put a JTextField:
public static JTextField textField_3;

textField_3 = new JTextField();
panel_5.add(textField_3, "9, 4, fill, default");
textField_3.setColumns(10);
User will write some text into textField_3. Then user click SAVE button in panel_3, it will perform this:
JButton button_4 = new JButton("SAVE");
button_4.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {

                setContentPane(contentPane);
                panel_3.revalidate();
                panel_3.repaint();
                panel_3.updateUI();

                panel_5.revalidate();
                panel_5.repaint();
                panel_5.updateUI();


                contentPane.revalidate();
                contentPane.repaint();

            JOptionPane.showMessageDialog(null, "Saved !");

        }
    });
    button_4.setBounds(873, 396, 75, 33);
    contentPane.add(button_4);
}
The result is, when I click SAVE button and close the Frame in newFoodUI, I will reopen back by click the FOOD button to check whether the text I wrote has been saved or not. But its not saving the text I wrote. 
解决方案
You have to save the value from the textfeld textField_3.getText() and set this value manually to textfeld when showing textField_3.setText(value). So you have to keep your value in your project or store persistent somewhere.

                        
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