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Java static code analysis

Unique rules to find Bugs, Vulnerabilities, Security Hotspots, and Code Smells in your JAVA code

Filtered: 55 rules found

pitfall

Impact

Clean code attribute

"java.time" classes should be used for dates and times

consistency - conventional

maintainability

Code Smell

MajorSonarSource default severity
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Why is this an issue?

The old, much-derided Date and Calendar classes have always been confusing and difficult to use properly, particularly in a multi-threaded context. JodaTime has long been a popular alternative, but now an even better option is built-in. Java 8’s JSR 310 implementation offers specific classes for:

Class	Use for
LocalDate	a date, without time of day, offset, or zone
LocalTime	the time of day, without date, offset, or zone
LocalDateTime	the date and time, without offset, or zone
OffsetDate	a date with an offset such as +02:00, without time of day, or zone
OffsetTime	the time of day with an offset such as +02:00, without date, or zone
OffsetDateTime	the date and time with an offset such as +02:00, without a zone
ZonedDateTime	the date and time with a time zone and offset
YearMonth	a year and month
MonthDay	month and day
Year/MonthOfDay/DayOfWeek/…	classes for the important fields
DateTimeFields	stores a map of field-value pairs which may be invalid
Calendrical	access to the low-level API
Period	a descriptive amount of time, such as "2 months and 3 days"

Noncompliant code example

Date now = new Date();  // Noncompliant
DateFormat df = new SimpleDateFormat("dd.MM.yyyy");
Calendar christmas  = Calendar.getInstance();  // Noncompliant
christmas.setTime(df.parse("25.12.2020"));

Compliant solution

LocalDate now = LocalDate.now();  // gets calendar date. no time component
LocalTime now2 = LocalTime.now(); // gets current time. no date component
LocalDate christmas = LocalDate.of(2020,12,25);

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