How to capture key combination press in java

Though it may appear extremely easy to someone who has mastered it, I wanna paste some useful code here both for myself to keep a note and for those who haven’t ever addressed this problem to use as a guideline.

Code snippet (catch “ctrl+shift+`”):

public final static int CTRL_SHIFT_MASK =
KeyEvent.SHIFT_MASK | KeyEvent.CTRL_MASK;

if ((evt.getModifiers() & CTRL_SHIFT_MASK) != 0) {
if (inputEnabled) holdInput(true);

// Press “Ctrl+Shift+`” to toggle view only option.
if ((evt.getModifiers() & CTRL_SHIFT_MASK) == CTRL_SHIFT_MASK &&
keyCode == KeyEvent.VK_BACK_QUOTE) {
boolean viewOnly = !_vc.getConfigManager().isViewOnly();
_vc.getConfigManager().setViewOnly(viewOnly);
if (!viewOnly) {
inputRecorder.setPaused(false);
inputRecorder.setLastLogTime(System.currentTimeMillis());
} else {
inputRecorder.setPaused(true);
}
clearInput();
return;
}

Here key combination restricts to the pattern of modifier key(s) (ctrl, shift, alt) plus ordinary character key or only combination of modifier keys themselves.

The end.