Code:
ChangeDetector changeDetector = new ChangeDetector("unplugged","plugged");
System.out.println(changeDetector.detectChange("unplugged"));
System.out.println(changeDetector.detectChange("plugged"));
System.out.println(changeDetector.detectChange("unplugged"));
System.out.println(changeDetector.detectChange("hi"));
System.out.println(changeDetector.detectChange("unplugged"));
System.out.println(changeDetector.detectChange("plugged"));
I've been coding this little boiler plate code too many times, so it was time to make an auxiliary class.