JTextArea not displaying text

Question

In my function for displaying text in textarea,i have written following lines of code but it is not displaying any text

        jTextArea1.setText( Packet +\         


        

Answer 1

Since your code snippet is just too small to give a correct answer I can think of:

1. When you are inside the update of jTextArea, Packet is null? Can you check that.

2. While calling this method is jTextArea has any text on it ? If none and Packet is null you wont see any result.

Edit: As per comment:

To append text use append, also read the tutorial

Though I would expect setText to show the text atleast first time, see below a bare minimum example code:

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.JTextField;

public class TestJTextArea {
    static void init() {
        JFrame frame = new JFrame();
        frame.setLayout(new BorderLayout());
        final JTextArea textArea = new JTextArea();
        frame.add(textArea, BorderLayout.NORTH);
        final JTextField textField = new JTextField();
        frame.add(textField,BorderLayout.CENTER);
        JButton button = new JButton("Add");
        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                textArea.setText(textField.getText());
            }
        });
        frame.add(button,BorderLayout.SOUTH);
        frame.pack();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        init();
    }
}

And with that I also agree with @Hovercraft Full Of Eels that you may have a Swing threading issue, or just use append to append text