In Java Swing, can I receive Caret events in real time?

In Java Swing, can I receive Caret events in real time?

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In Java Swing, can I receive Caret events in real time?
Tag : java , By : user185949
Date : November 26 2020, 01:01 AM

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How do I write logs and display them real-time in a Java Swing application?

Tag : java , By : toma
Date : March 29 2020, 07:55 AM
will help you Create a wrapper that
updates your JTextArea logs via log4j, SLF4J or Apache Commons Logging or another logging framework
public void log(String msg) {

Java Swing Reset Caret

Tag : java , By : TBG
Date : March 29 2020, 07:55 AM
it should still fix some issue You just have to call myTextArea.setCaretPosition(0).

TCP how to send/receive real-time large packets in Java?

Tag : java , By : Lord Zantor
Date : March 29 2020, 07:55 AM
help you fix your problem The trouble you're having is how InputStreams work. When you call read(buf,offset,length) it doesn't always read length bytes everytime. It simply reads what is available() on the InputStream, and returns the number of bytes it read. So you need to continue to call read until you've actually read length bytes.
int len = 0;
int expectedLength = sockInput.readInt();
byte[] buf = new byte[ expectedLength ];
while( len != buf.length ) {
   len += sockInput.read( buf, len, buf.length );

// now you have a buffer with expectedLength data in it.
DataInputStream ds = new DataInputStream( sock.getInputStream() );
ds.readFully( buf, 0, buf.length );
Reader reader = new InputStreamReader( sockInput.getInputStream(), "UTF-8" );

Swing JTextArea caret events

Tag : java , By : mux
Date : March 29 2020, 07:55 AM
it fixes the issue Are there any events fired when caret is "blinking"? , Check the method of DefaultCaret
protected synchronized void damage(Rectangle r)

Java Swing.Timer get real time millisecond

Tag : java , By : shehan
Date : March 29 2020, 07:55 AM
this will help You will want to get rid of that while (true) and instead use the Swing Timer in its place since that is what the Timer is for -- to repeatedly make calls in a Swing GUI without having to resort to a thread-breaking while (true) construct. You will want to give your Timer a reasonable delay time. 0? Common sense tells you not to use this. 12, 15 -- better. For a Swing Timer to work, you need to have an active Swing event thread, and this can be obtained by showing a Swing GUI, any GUI such as a JOptionPane.
For example:
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.Timer;

class Lsen implements ActionListener {
   public static final int MSECS_PER_SEC = 1000;
   public static final int SECS_PER_MIN = 60;
   public static final int MIN_PER_HR = 60;
   private static final String TIME_FORMAT = "%02d:%02d:%02d:%03d";

   private long startTime;
   private JTextField timeField;

   public Lsen(JTextField timeField) {
      this.timeField = timeField;

   public void actionPerformed(ActionEvent e) {
      if (startTime == 0L) {
         startTime = System.currentTimeMillis();
      } else {
         long currentTime = System.currentTimeMillis();
         int diffTime = (int) (currentTime - startTime);

         int mSecs = diffTime % MSECS_PER_SEC;
         diffTime /= MSECS_PER_SEC;

         int sec = diffTime % SECS_PER_MIN;
         diffTime /= SECS_PER_MIN;

         int min = diffTime % MIN_PER_HR;
         diffTime /= MIN_PER_HR;

         int hours = diffTime;

         String time = String.format(TIME_FORMAT, hours, min, sec, mSecs);
         // System.out.println("Time: " + time);

public class StopWatchMain {
   private static final int TIMER_DELAY = 15;

   public static void main(String[] args) {
      final JTextField timeField = new JTextField(10);
      JPanel panel = new JPanel();
      panel.add(new JLabel("Elapsed Time:"));

      Lsen l = new Lsen(timeField);
      Timer t = new Timer(TIMER_DELAY, l);
      JOptionPane.showMessageDialog(null, panel);
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