java 自定义类似C++ Pair

    public static class GenericPair<E extends Object, F extends Object> {        private E first;        private F second;        public GenericPair(){        }        public E getFirst() {            return first;        }        public void setFirst(E first) {            this.first = first;        }        public F getSecond() {            return second;        }        public void setSecond(F second) {            this.second = second;        }    }