JAVA - How to call external application

try {
  Process p = Runtime.getRuntime().exec( "notepad.exe" );

} catch ( IOException ex ) {
  Logger.getLogger( Window.class.getName() ).log( Level.SEVERE, null, ex );
}

When you need to call it with parameter(s):

try {
  Process p = Runtime.getRuntime().exec( "notepad.exe c:\\test.txt" );

} catch (IOException ex) {
  Logger.getLogger( Window.class.getName() ).log( Level.SEVERE, null, ex );
}

When you use java.lang.Process.WaitFor() function your application will be wait to the end of the called program.

try {
  Process p = Runtime.getRuntime().exec( "notepad.exe c:\\test.txt" );

  try {
    /* -- wait for end of notepad.exe */
    p.waitFor();
  } catch ( InterruptedException ex ) {
    Logger.getLogger( Window.class.getName() ).log( Level.SEVERE, null, ex );
  }

} catch (IOException ex) {
  Logger.getLogger(Window.class.getName()).log(Level.SEVERE, null, ex);
}