Question

我是java的新手，并尝试在NetBeans 7.4中创建一个表单，该表单将采用名为“name”的变量并将其用作jTextField的显示名称。我尝试了很多东西，这是我能得到的尽可能接近（不起作用，但我没有错误）。您能否查看代码并帮助我了解我所缺少的内容。 class StatusScreen扩展了javax.swing.JFrame {

public StatusScreen() {                         // Creates new form StatusScreen
    initComponents();
}

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

    PartName = new javax.swing.JTextField();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
    addWindowListener(new java.awt.event.WindowAdapter() {
        public void windowOpened(java.awt.event.WindowEvent evt) {
            formWindowOpened(evt);
        }
    });

    PartName.setEditable(false);
    PartName.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
    PartName.setHorizontalAlignment(javax.swing.JTextField.CENTER);

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
            .addContainerGap()
            .addComponent(PartName, javax.swing.GroupLayout.DEFAULT_SIZE, 380, Short.MAX_VALUE)
            .addContainerGap())
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addContainerGap()
            .addComponent(PartName, javax.swing.GroupLayout.PREFERRED_SIZE, 54, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addContainerGap(235, Short.MAX_VALUE))
    );

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

private void formWindowOpened(java.awt.event.WindowEvent evt) {                                  
    setExtendedState(JFrame.MAXIMIZED_BOTH);
}                                 

//public static void main(String args[]) {                      //This is here for class testing.
public void showStatusScreen(final String name){                //This is program entry point.
    /* Set the Nimbus look and feel */
    //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
    /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
     * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
     */
    try {
        for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
            if ("Nimbus".equals(info.getName())) {
                javax.swing.UIManager.setLookAndFeel(info.getClassName());
                break;
            }
        }
    } catch (ClassNotFoundException ex) {
        java.util.logging.Logger.getLogger(StatusScreen.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
        java.util.logging.Logger.getLogger(StatusScreen.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
        java.util.logging.Logger.getLogger(StatusScreen.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
        java.util.logging.Logger.getLogger(StatusScreen.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    }
    //</editor-fold>

    java.awt.EventQueue.invokeLater(new Runnable() {            //To create and display the form
        @Override
        public void run() {
            new StatusScreen().setVisible(true);
        }
    });
    java.awt.EventQueue.invokeLater(new Runnable() {            //Trying to initialize the PartName field with String name (not working)
  @Override
  public void run() {                                           //Trying to initialize the PartName field with String name
     PartName.setText(name);                                    //Trying to initialize the PartName field with String name
  }                                                             //Trying to initialize the PartName field with String name

}）; }

// Variables declaration - do not modify                     
private javax.swing.JTextField PartName;
// End of variables declaration

}

Answer 1

要解决的问题：

您不需要两个线程来运行应用程序，然后另一个线程来设置文本。在一个地方做两件事
PartName是StatusScreen类中的字段。因此，您需要创建StatusScreen的实例并使用一个将调用PartName.setText(name)的setter方法。如果没有它的实例，则无法调用另一个类的字段。

主要方法包括以下内容：

StatusScreen ss = new StatusScreen();
ss.setVisible(true);
ss.setPartName(name);

setPartName方法类似于：

public void setPartName(String name){
    PartName.setText(name);
}

如何将变量加载为jTextField显示文本

1 个答案: