Question

Is there any way to turn off the monitor screen light using java code like a screen saver does.Pressing a button will turn off the screen light and for pressing any key or mouse move the light comes back.

Answer 1

That is a function that is already implemented by your operating system. It is tied in so deeply within operation system and hardware dependent functions turning it’s difficult to do it in pure Java, anyway you can easily do it on C++

#include <windows.h>
#include <ctime>

int main() {
  int seconds = 10;
  clock_t delay = seconds *CLOCKS_PER_SEC, start = clock();

  while(clock() - start < delay)
    SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, (LPARAM) 2);

  SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, (LPARAM) 2);
  return 0;
}