5 Java Classes No one know about | Java Puzzle |

The same classes will definitely make programming easier, faster, and more efficient for you.
1. The DoubleSummaryStatistics Class
Although initially confusing, the DoubleSummaryStatistics class is simply used to collect statistics. Information such as the average, the maximum, and the minimum can be stored.
2. The StringTokenizer Class
The StringTokenizer class works with strings. Specifically, it decomposes a string into tokens. This offers a quick alternative for separating words in a string, an important aspect of string manipulation.
3. The Currency Class
As its name suggests, the currency class is used when working with currency values. Methods in this class allow access and manipulation of currency-related aspects. I find this particular class useful when designing financial applications or programs.
4. The TimeZone Class
The Timezone Class is used to get UTC time zone offsets. A UTC offset is the amount of time a certain time zone is ahead of or behind the Coordinated Universal Time (UTC).
5. The GregorianCalendar Class
The Gregorian Calendar Class is a concrete subclass of the Calendar class.
The Calendar class is an abstract class. A concrete subclass is a subclass of an abstract class.

0:00 Introduction
0:25 DoubleSummary Statistics
2:50 StringTokenizer
6:54 Currency
8:09 TimeZone
10:26 GregorianCalendar