將jtextfield值從一個類傳遞到另一個類

Question

我有一個關於如何單擊按鈕將jextfield的值從一幀傳遞到第二幀的jtextfield的問題。

下面的示例在凈工資文本字段中輸入值之后，單擊添加按鈕，該值將傳遞到第二幀的凈工資文本字段中。

框架1.我試圖在按鈕上添加actionlistener以獲取文本，但是如何在第二個框架中設置它呢？ 感謝任何人都可以提供一些建議和幫助。

public class Frame1 extends JFrame{
public Frame1() {

    JPanel guiPanel = new JPanel(new GridBagLayout());

    JLabel Nett = new JLabel("Nett Wage: ");
    final JTextField nettNameTextField = new JTextField(10);
    JButton addButton = new JButton("Add");


    JPanel fields = new JPanel(new GridBagLayout());

    GridBagConstraints labelGBC = new GridBagConstraints();
    labelGBC.insets = new Insets(10, 3, 3, 3);
    GridBagConstraints fieldGBC = new GridBagConstraints();
    fieldGBC.insets = new Insets(10, 3, 3, 3);
    GridBagConstraints titleGBC = new GridBagConstraints();
    fieldGBC.gridwidth = GridBagConstraints.REMAINDER;


    fields.add(Nett, labelGBC);
    fields.add(nettNameTextField, fieldGBC);


    JPanel buttons = new JPanel(new GridBagLayout());

    GridBagConstraints addButtonGBC = new GridBagConstraints();
    addButtonGBC.insets = new Insets(40, 3, 3, 3);
    cancelButtonGBC.gridwidth = GridBagConstraints.REMAINDER;
    buttons.add(addButton, addButtonGBC);


    GridBagConstraints gbc = new GridBagConstraints();
    gbc.gridwidth = GridBagConstraints.REMAINDER;
    guiPanel.add(fields, gbc);
    guiPanel.add(buttons, gbc);


    add(guiPanel, BorderLayout.CENTER);

    /*addButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            String value = nettNameTextField.getText();

        }
    });*/

框架2。如何在此處在文本字段中設置值？

public class Frame2 extends JFrame {
public Frame2() {


    JPanel guiPanel = new JPanel(new GridBagLayout());


    JLabel nett = new JLabel("Nett Wage: ");
    JTextField nettNameTextField = new JTextField(10);


    JPanel fields = new JPanel(new GridBagLayout());


    GridBagConstraints labelGBC = new GridBagConstraints();
    labelGBC.insets = new Insets(10, 3, 3, 3);
    GridBagConstraints fieldGBC = new GridBagConstraints();
    fieldGBC.insets = new Insets(10, 3, 3, 3);
    //GridBagConstraints titleGBC = new GridBagConstraints();
    fieldGBC.gridwidth = GridBagConstraints.REMAINDER;




    JPanel savingspanel = new JPanel(new GridBagLayout());

    GridBagConstraints totallabelsGBC = new GridBagConstraints();
    totallabelsGBC.insets = new Insets(10, 3, 3, 3);
    GridBagConstraints totalfieldGBC = new GridBagConstraints();
    totalfieldGBC.insets = new Insets(10, 3, 3, 3);
    totalfieldGBC.gridwidth = GridBagConstraints.REMAINDER;
    savingspanel.add(nett, labelGBC);
    savingspanel.add(nettNameTextField, fieldGBC);



    add(guiPanel, BorderLayout.CENTER);                      
        }       
}                 
}

Answer 1

如果在Frame1之前存在Frame2的實例

在Frame1中，在構造函數或mutator方法中傳遞Frame2的實例。

public Frame1(Frame2 frame2)
{
    this.frame2 = frame2;
}

然后在Frame2 ，有一個可以更新值的方法，例如updateNetWage 。

public void updateNetWage(String value)
{
    nettNameTextField.setText(value);
}

然后，您可以在actionListener函數中簡單地調用：

frame2.updateNetWage(value);

如果Frame2的實例不可用

您可以為Frame2定義一個參數構造Frame2 ，因此您可以創建一個包含值的新對象。

public Frame2(String netNameValue)
{
    nettNameTextField.setText(netNameValue);
}