Java-How to extend InputStream to read from a JTextField?

Question

Working on a project I got into running java applications through a small console-like window. Thanks to the wonderful community in here I managed to solve the problem with

Answer 1

What I don't understand if why you need a JTextField that extends InputStream? Basically, what you are looking for is:

1. Add an ActionListener on the JTextField (ie, when use presses Enter, actionPerformed will be invoked)
2. You need to grab the text of the JTextField using getText()
3. You can then "transform" the String text to an InputStream with new ByteArrayInputStream(text.getBytes("UTF-8"));

Here is a small snippet that should get you the basic idea:

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;

import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;

public class TestTextField {

    private void initUI() {
        JFrame frame = new JFrame(TestTextField.class.getSimpleName());
        frame.setLayout(new FlowLayout());
        final JTextField textfield = new JTextField(20);
        textfield.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                try {
                    String text = textfield.getText();
                    InputStream is = new ByteArrayInputStream(text.getBytes("UTF-8"));
                    // Here do something with your input stream (something non-blocking)
                    System.err.println(text);
                } catch (UnsupportedEncodingException e1) {
                    e1.printStackTrace();
                }

            }
        });
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(textfield);
        frame.setSize(300, 300);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                new TestTextField().initUI();
            }
        });
    }

}