According to www.codekatas.org
Code Kata is a term coined by Dave Thomas, co-author of the book The Pragmatic Programmer, in a bow to the Japanese concept of kata in the martial arts. A code kata is an exercise in programming which helps a programmer hone their skills through practice and repetition.
Also refer codekata.com
The Java8 Code Kata is created to walk-through java8 new API functions. I hope this helps you learn Java8 and get used to it. Repeating exercises will definitely upgrade your skills.
Edit the unit tests to pass them by following its description.
Test sample.
@Test
@Necessity(true)
public void simpleAddition() {
/**
* Get an addition result of 1 and 2 by using an operator "+".
*/
Integer added = null;
assertThat(added, is(3));
}
You need to edit the program under the comment.
Solution sample.
@Test
@Necessity(true)
public void simpleAddition() {
/**
* Get an addition result of 1 and 2 by using an operator "+".
*/
Integer added = 1 + 2;
assertThat(added, is(3));
}
Most tests are annotated with @Necessity(true)
which means the test only requires basic knowledge.
Tests annotated with @Necessity(false)
are more difficult and need to think to solve them.
Check the 'solution' branch, but please try to solve by yourself at first.
- Exercise1Test.java
Iterable#forEach
, Collection#removeIf
, List#replaceAll
, List#sort
, Collection#stream
and Collection#parallelStream
- Exercise2Test.java
Map#getOrDefault
, Map#putIfAbsent
, Map#merge
and Map#computeIfPresent
- Exercise1Test.java
Stream#filter
and Stream#map
- Exercise2Test.java
Stream#sorted
, Stream#distinct
, Stream#limit
and Stream#flatMap
- Exercise3Test.java
Stream#count
, Stream#max
and Stream#min
- Exercise4Test.java
Stream#findFirst
, Stream#allMatch
, Stream#anyMatch
and Stream#noneMatch
- Exercise5Test.java
Stream#collect
and Collectors
- Exercise6Test.java
Stream#of
and Stream#iterate
- Exercise7Test.java
IntStream
, LongStream
and DoubleStream
- Exercise8Test.java
Advanced problems
- Exercise9Test.java
Collector
- Exercise1Test.java
LocalDate#of
, LocalDate#parse
, LocalDate#with
, LocalDate#plus
, LocalDate#minus
, LocalDate#isAfter
, LocalDate#isBefore
and LocalDate#until
- Exercise2Test.java
LocalTime#of
, LocalTime#parse
, LocalTime#with
, LocalTime#plus
, LocalTime#minus
, LocalTime#isAfter
, LocalTime#isBefore
and LocalTime#truncatedTo
- Exercise3Test.java
LocalDateTime#of
, LocalDateTime#parse
, LocalDateTime#format
, LocalDateTime#toLocalDate
, LocalDateTime#toLocalTime
, LocalDate#atTime
and LocalTime#atDate
- Exercise4Test.java
ZonedDateTime#of
, ZonedDateTime#parse
, ZonedDateTime#format
, LocalDateTime#atZone
, ZonedDateTime#withZoneSameInstant
and ZonedDateTime#withZoneSameLocal
- Exercise5Test.java
LocalDateTime
to java.sql.Timestamp
, LocalDate
to java.sql.Date
, and vice versa