private void button4ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_button4ActionPerformed
        // TODO add your handling code here:
        if (step == false && clicked == false) {
            step = true;
            synchronized (this) {
                this.notifyAll();
            }
        }
    }//GEN-LAST:event_button4ActionPerformed