question: creates a callable which immediately returns a preset value each time it is called . concode_field_sep PlaceHolder placeHolder concode_field_sep Callable<T> threadRenaming concode_elem_sep Runnable threadRenaming concode_elem_sep boolean trySetName
target: Callable < T > function ( @ Nullable final T arg0 ) { return new Callable < T > ( ) { @ Override public T call ( ) { return arg0 ; } } ; }