Start notepad with java

Open notepad with java

private void execute() {
  Runtime r=Runtime.getRuntime();
  try {
   Process p=r.exec("notepad.exe");
  } catch (IOException e) {
   e.printStackTrace();
  }
 }

Open a file in notepad with java

private void execute() {
  Runtime r=Runtime.getRuntime();
  try {
   Process p=r.exec("notepad.exe C://yourfile.txt");
  } catch (IOException e) {
   e.printStackTrace();
  }
 }