ensures the truth of an expression involving one or more parameters to the calling method . concode_field_sep PlaceHolder placeHolder concode_field_sep T checkNotNull concode_elem_sep T checkNotNull concode_elem_sep T checkNotNull concode_elem_sep void checkState concode_elem_sep void checkState concode_elem_sep void checkState
void function ( boolean arg0 , String arg1 , Object ... arg2 ) { if ( ! arg0 ) { throw new IllegalArgumentException ( String . format ( arg1 , arg2 ) ) ; } }