java - JTextField 不能被引用
问题描述
我正在开发一个使用 SQL Server 和 Java 进行员工管理的项目。在为addEmployee
我添加功能时遇到了这个问题。
我无法引用JTextField
组件(txtName
和txtAge
)txtAddress
。我可能完全错过了一些东西。在尝试为按钮创建jButtonActionPerformed()
方法时,所有文本字段都给出错误,并且没有任何文本字段名称显示为自动更正,就好像它们不存在一样。Add
getText()
有人可以帮我弄清楚如何在这段代码中使用文本字段对象吗?
public class EmployeeDialog extends javax.swing.JDialog {
/**
* Creates new form EmployeeDialog
*/
public EmployeeDialog(java.awt.Frame parent, boolean modal) {
super(parent, modal);
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
javax.swing.JLabel jLabel1 = new javax.swing.JLabel();
javax.swing.JLabel jLabel2 = new javax.swing.JLabel();
javax.swing.JLabel jLabel3 = new javax.swing.JLabel();
javax.swing.JTextField txtAddress = new javax.swing.JTextField();
javax.swing.JTextField txtAge = new javax.swing.JTextField();
javax.swing.JButton btnCancel = new javax.swing.JButton();
javax.swing.JButton jButton1 = new javax.swing.JButton();
javax.swing.JTextField txtName = new javax.swing.JTextField();
setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
jLabel1.setText("Name:");
jLabel2.setText("Age:");
jLabel3.setText("Address:");
btnCancel.setText("Cancel");
btnCancel.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnCancelActionPerformed(evt);
}
});
jButton1.setText("Add");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(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(46, 46, 46)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGap(33, 33, 33)
.addComponent(jButton1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 155, Short.MAX_VALUE)
.addComponent(btnCancel))
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel3)
.addComponent(jLabel2)
.addComponent(jLabel1))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(txtAge)
.addComponent(txtAddress)
.addComponent(txtName, javax.swing.GroupLayout.DEFAULT_SIZE, 240, Short.MAX_VALUE))))
.addContainerGap(57, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(32, 32, 32)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel1)
.addComponent(txtName, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel2)
.addComponent(txtAge, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel3)
.addComponent(txtAddress, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(45, 45, 45)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(btnCancel)
.addComponent(jButton1))
.addContainerGap(17, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void btnCancelActionPerformed(java.awt.event.ActionEvent evt) {
this.dispose();
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
String name = txtName.getText();
int age = Integer.parseInt(txtAge.getText());
String address = txtAddress.getText();
Employee e = new Employee (name, age, address);
EmployeeManager em = (EmployeeManager) this.getParent();
em.addEmployee(e);
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* 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(EmployeeDialog.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(EmployeeDialog.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(EmployeeDialog.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(EmployeeDialog.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the dialog */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
EmployeeDialog dialog = new EmployeeDialog(new javax.swing.JFrame(), true);
dialog.addWindowListener(new java.awt.event.WindowAdapter() {
@Override
public void windowClosing(java.awt.event.WindowEvent e) {
System.exit(0);
}
});
dialog.setVisible(true);
}
});
}
// Variables declaration - do not modify
// End of variables declaration
}
解决方案
您尝试访问的所有字段都被定义为该initComponents
方法的局部变量。它们将无法在其上下文之外访问......
private void initComponents() {
javax.swing.JLabel jLabel1 = new javax.swing.JLabel();
javax.swing.JLabel jLabel2 = new javax.swing.JLabel();
javax.swing.JLabel jLabel3 = new javax.swing.JLabel();
javax.swing.JTextField txtAddress = new javax.swing.JTextField();
javax.swing.JTextField txtAge = new javax.swing.JTextField();
javax.swing.JButton btnCancel = new javax.swing.JButton();
javax.swing.JButton jButton1 = new javax.swing.JButton();
javax.swing.JTextField txtName = new javax.swing.JTextField();
转到您班级的 Netbeans 表单设计器。单击其中一个字段,选择“代码”选项卡并取消选中“使用局部变量”选项
重复并冲洗您希望能够从整个班级中访问的所有组件
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