Java APIs

Why am i getting a return of both true and false on a boolean at the same time?
This is part of my code:

switch (cStoreInput)
 {
    //case ' ': if(!isInputValid(getInputOnString())) Error.errorVarOrFunctionDoesNotExist(nRow); break;
    //case ';': if(!isInputValid(getInputOnString())) Error.errorVarOrFunctionDoesNotExist(nRow); break;
    case ' ': System.out.println(isInputValid(getInputOnString())); break;
}

private static boolean isInputValid(String strInput)
    {
        if (strInput.equals("abc"))
        {
            strValueTryingToStore = strInput;
            nCurrentState = 0;
            if (isTextValid() != null)  return true;
        }

        return false;
    }

in cmd, it says
true
false

Im pretty sure it should return true, but why is there a false? I only called that boolean function once.

btw, all of my functions are in static.