System.setIn just changes the standard input device of the current application. You can use the following example:
public class NewSystemIn {
public static void main(String ...args) {
Scanner scanner = new Scanner(System.in);
while (scanner.hasNextLine()) {
System.out.println(scanner.nextLine());
}
}
}when Program 1 outputs the contents of a custom input device, Program 2 still behaves normally (can read keyboard input).
Keyboard won't be implemented so easily.
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