我正在尝试构建一个具有文本区域控制台的应用程序，我无法将文本追加或添加到jtextarea内的文本中。我想知道是否有人可以帮助我解决为什么我的代码没有显示错误？
代码如下：
表格1：
package com.company;
public class Form1 extends javax.swing.JFrame {
private javax.swing.JButton btnComboBox;
private javax.swing.JComboBox<String> comboOne;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
public Form1() {
initComponents();
}
@SuppressWarnings("unchecked")
private void initComponents() {
jLabel2 = new javax.swing.JLabel();
comboOne = new javax.swing.JComboBox<>();
jLabel3 = new javax.swing.JLabel();
btnComboBox = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel2.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
jLabel2.setText("SELECT PRINTER:");
comboOne.setModel(new javax.swing.DefaultComboBoxModel<>(new String[] { "Printer 1", "Printer 2", "Printer 3", "Printer 4" }));
comboOne.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
comboOneActionPerformed(evt);
}
});
jLabel3.setFont(new java.awt.Font("Tahoma", 1, 11));
jLabel3.setText("ZEBRA PRINTER ");
btnComboBox.setText("GO");
btnComboBox.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnComboBoxActionPerformed(evt);
}
});
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(154, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jLabel3, javax.swing.GroupLayout.PREFERRED_SIZE, 90, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(comboOne, javax.swing.GroupLayout.Alignment.LEADING, 0, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jLabel2, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 93, Short.MAX_VALUE)
.addComponent(btnComboBox, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))
.addGap(153, 153, 153))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel3)
.addGap(18, 18, 18)
.addComponent(jLabel2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(comboOne, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(btnComboBox)
.addContainerGap(176, Short.MAX_VALUE))
);
pack();
}
private void comboOneActionPerformed(java.awt.event.ActionEvent evt) {
Object selected = comboOne.getSelectedItem().toString();
}
private void btnComboBoxActionPerformed(java.awt.event.ActionEvent evt) {
// Opens a new form, converts the object selected in combobox too a string
// Passes string to openMe on form 2
Form2 f2 = new Form2();
f2.openMe(comboOne.getSelectedItem().toString());
this.setEnabled(false);
}
public static void main(String args[]) {
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(Form1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Form1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Form1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Form1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Form1().setVisible(true);
}
});
}
}
表格2：
package com.company;
public class Form2 extends javax.swing.JFrame {
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel3;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JTextArea jta;
public Form2() {
initComponents();
jta.append("----- Console Output ------\n");
jta.append("----------------------------------");
}
@SuppressWarnings("unchecked")
private void initComponents() {
jLabel1 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
jta = new javax.swing.JTextArea();
jScrollPane2 = new javax.swing.JScrollPane();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel1.setText("Console");
jLabel3.setFont(new java.awt.Font("Tahoma", 1, 11));
jLabel3.setText("ZEBRA PRINTER ");
jta.setColumns(20);
jta.setRows(5);
jScrollPane2.setViewportView(jta);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel1))
.addGroup(layout.createSequentialGroup()
.addGap(158, 158, 158)
.addComponent(jLabel3)))
.addGap(0, 192, Short.MAX_VALUE))
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jScrollPane2)))
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(12, 12, 12)
.addComponent(jLabel3)
.addGap(17, 17, 17)
.addComponent(jLabel1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jScrollPane2, javax.swing.GroupLayout.DEFAULT_SIZE, 276, Short.MAX_VALUE)
.addContainerGap())
);
pack();
}
public void openMe(String message) {
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(Form2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Form2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Form2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Form2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Form2().setVisible(true);
new Form1().setVisible(false);
}
});
System.out.println("----- Console Output ------");
System.out.println("---------------------------");
System.out.println("Printer selected: "+ message);
System.out.println("---------------------------");
System.out.println("\n");
jta.setText(message);
jta.append("Printer selected:"+message);
}
}
任何帮助一如既往的赞赏。