Question

关于java的JTextArea显示问题：把str对象在JTextArea对象中显示出来，麻烦改下代码，文本框可以不用管它

public class JH extends JFrame {

private JPanel contentPane;
static private JTextArea jta;
private JTextField textField;

/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
JH frame = new JH();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
// jta = new JTextArea();
// JScrollPane jspane = new JScrollPane(jta,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
}

/**
* Create the frame.
*/
public JH() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);

JTextArea textArea = new JTextArea();
textArea.setBounds(10, 18, 424, 112);
textArea.setAutoscrolls(true);
contentPane.add(textArea);

JButton btnNewButton = new JButton("New button");
btnNewButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
try {
String str="你是谁？";
jta =new JTextArea(str);
// textField.setText(str);

} catch (Exception e1) {
System.out.println("错误");
}
}
});
btnNewButton.setBounds(70, 171, 93, 23);
contentPane.add(btnNewButton);

textField = new JTextField();
textField.setBounds(36, 140, 77, 21);
contentPane.add(textField);
textField.setColumns(10);
}

}

Answer 1

public class JH extends JFrame {

private JPanel contentPane;
static private JTextArea jta;
private JTextField textField;

/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
JH frame = new JH();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
// jta = new JTextArea();
// JScrollPane jspane = new JScrollPane(jta,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
}

/**
* Create the frame.
*/
public JH() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);

JTextArea textArea = new JTextArea();
textArea.setBounds(10, 18, 424, 112);
textArea.setAutoscrolls(true);
contentPane.add(textArea);

JButton btnNewButton = new JButton("New button");
btnNewButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
try {
String str="你是谁？";
//jta =new JTextArea(str);
textArea.setText(str);
// textField.setText(str);

} catch (Exception e1) {
System.out.println("错误");
}
}
});
btnNewButton.setBounds(70, 171, 93, 23);
contentPane.add(btnNewButton);

textField = new JTextField();
textField.setBounds(36, 140, 77, 21);
contentPane.add(textField);
textField.setColumns(10);
}

}