java - JTextField无法在Netbeans IDE中按预期方式工作

我有一个名为MainFrem的班级

public class MainFrem extends javax.swing.JFrame {

    public MainFrem() {
        initComponents();

    }

    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        ok = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        ok.setText("ok");
        ok.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                okActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(74, 74, 74)
                .addComponent(ok)
                .addContainerGap(144, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(62, 62, 62)
                .addComponent(ok)
                .addContainerGap(70, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>

    private void okActionPerformed(java.awt.event.ActionEvent evt) {
        new SecondClass().setVisible(true);
        System.out.println("Ok button Pressed.");
        new SecondClass().FeelIn.setText("Operation Successful.");

    }

    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new MainFrem().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify
    private javax.swing.JButton ok;
    // End of variables declaration
}

第二类是

public class SecondClass extends javax.swing.JFrame {
    public SecondClass() {
        initComponents();
    }
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        FeelIn = new javax.swing.JTextField();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(48, 48, 48)
                .addComponent(FeelIn, javax.swing.GroupLayout.PREFERRED_SIZE, 67, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(62, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(29, 29, 29)
                .addComponent(FeelIn, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(53, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new SecondClass().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify
    public javax.swing.JTextField FeelIn;
    // End of variables declaration
}

我正在使用NetBeans IDE，并且大多数代码是由IDE生成的。在名为Mainfrem的类中，我编写了以下代码，这是我在两个类中编写的唯一代码。

private void okActionPerformed(java.awt.event.ActionEvent evt) {
    new SecondClass().setVisible(true);
    System.out.println("Ok button Pressed.");
    new SecondClass().FeelIn.setText("Operation Successful.");

}

在名为MainFrem的类中，我使用一个JButton并设置动作侦听器，如上所示，在名为SecondClass的类中，我仅添加了一个名为FeelIn的JTextField。我试图按类ok中的MainFrem按钮，并将SecondClass中的JTextField更改为Operation Successful.。 SecondClass中的JTextField不会更改为Operation Successful是否有解决此问题的方法。

最佳答案

您两次都拨打new SecondClass()。我假设您要执行的操作是：

private void okActionPerformed(java.awt.event.ActionEvent evt) {
    SecondClass frame = new SecondClass()
    frame.setVisible(true);
    System.out.println("Ok button Pressed.");
    frame.FeelIn.setText("Operation Successful.");
}