Code:
char letter;
char newletter;
char[]alf={'A','a','B','b','C','c','D','d','E','e','F','f','G','g','H','h','I','i','J','j','K','k','L','l','M','m','N','n','O','o','P','p','Q','q','R','r','S','s','T','t','U','u','V','v','W','w','X','x','Y','y','Z','z'};
char[]fla={'Z','z','Y','y','X','x','W','w','V','v','U','u','T','t','S','s','R','r','Q','q','P','p','O','o','N','n','M','m','L','l','K','k','J','j','I','i','H','h','G','g','F','f','E','e','D','d','C','c','B','b','A','a'};
private void OutputKeyReleased(java.awt.event.KeyEvent evt) {
String result;
String s=Input.getText();
letter=s.charAt(0);
for (int i = 0; i<alf.length;i++){
if (letter==alf[i]){
newletter=fla[i];
result=Character.toString(newletter);
Output.setText(result);
}
}
}