Java记录

　　//BigDecimal 去掉结尾的0
    @Test
    public void DecimalTest(){
        String test1 = BigDecimal.valueOf(45.00).stripTrailingZeros().toPlainString();

        assert  "45".equals(test1) : "失败";
    }

Java 时间处理  https://github.com/JodaOrg/joda-time

java排序

List.stream().sorted(Comparator.comparing(Model::getItem).reversed())
                                         .collect(Collectors.toList());