You can't always just use the KeyEvent.VK... variable.
For example on my keyboard the "%" character is above the "5". To use a Robot to type a "5", the code would be:
robot.keyPress(KeyEvent.VK_5);
robot.keyRelease(KeyEvent.VK_5);
and use a Robot to type a "%", the code would be:
robot.keyPress(KeyEvent.VK_SHIFT);
robot.keyPress(KeyEvent.VK_5);
robot.keyRelease(KeyEvent.VK_5);
robot.keyRelease(KeyEvent.VK_SHIFT);
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