I have form and that have a label I would when I run the program my counter count in label
but when i run that's nothing open the form and nothing and that's my cod where error

private static int totalNum = 0;
    private void formWindowActivated(java.awt.event.WindowEvent evt) {
      class Counter extends Thread {
  private int currentNum, loopLimit;

  public Counter(int loopLimit) {
    this.loopLimit = loopLimit;
    currentNum = totalNum++;

  private void pause(double seconds) {
    try { Thread.sleep(Math.round(1000.0*seconds)); }
    catch(InterruptedException ie) {}
  public void run() {
    for(int i=0; i<loopLimit; i++) {
      jLabel1.setText(String.valueOf(currentNum)+String.valueOf(i) );

Where are the form and the label? Where do you make them visible? We need the rest of your code.