ensures that an object reference passed as a parameter to the calling method is not null . concode_field_sep PlaceHolder placeHolder concode_field_sep void checkState concode_elem_sep String format concode_elem_sep void checkArgument concode_elem_sep void checkArgument concode_elem_sep String checkNotNullNorEmpty concode_elem_sep T checkNotNullNorEmpty
T function ( T arg0 ) { if ( arg0 == null ) { throw new NullPointerException ( ) ; } return arg0 ; }