Move file as Java8.
Add 'Stream' learning test.
Add 'match' pattern test.
Change call 'Method reference'.
Add 'grouping' on test.
Add new function 'java.util.List', 'java.util.Map' on test.
Change Javadoc comment.
Add stream 'lazy evaluation' on test.
Add 'DateTime API' on test.
Delete .project
Add 'Optional' on test.
Merge branch 'feature/java8' of git@github.com:naotawool/learning_java.git into feature/java8
Merge pull request #1 from naotawool/feature/java8

Feature/java8