a function that maps to the first element in a pair . concode_field_sep A first concode_elem_sep B second concode_field_sep A getFirst concode_elem_sep int hashCode concode_elem_sep Pair<A,B> of concode_elem_sep boolean equals concode_elem_sep B getSecond concode_elem_sep String toString concode_elem_sep Function<Pair<A,B>,B> secondFunction concode_elem_sep Comparator<Pair<T,B>> compareByFirst
Function < Pair < A , B > , A > function ( ) { return new Function < Pair < A , B > , A > ( ) { @ Override public A apply ( Pair < A , B > arg0 ) { return arg0 . first ; } } ; }