Non-static method cannot be referenced from a static context

使用范型类的方法引用时会出现上下文获取不到范型

在方法前指定对应的范型即可

        List<Pair<String, Long>> data = new ArrayList<>();
        // Non-static method cannot be referenced from a static context
        data.stream()
                .sorted(Comparator.comparing(Pair::getValue).reversed())
                .collect(Collectors.toList());
        // 指定对应的范型
        data.stream()
                .sorted(Comparator.<Pair<String, Long>, Long>comparing(Pair::getValue).reversed())
                .collect(Collectors.toList());