#purpose: for create a nice interface for an excellent project
#especially look at the variable rv, it just for debugging in order to get the error reason
public native String sendMessage(int rv);
public native String changeMessage(String s, int rv);
public native String[] getMessage(int rv);
public native String[] setMessage(String sendMessage1, String sendMessage2, int rv);
public native String[] checkMessage(String[] sMessage, int rv);
public native void cleanMessage(String[] sMessage, int rv);