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squid:S1319 - Declarations should use Java collection interfaces such as List rather than specific implementation classes such as LinkedList	https://github.com/wncoder/java-design-patterns/commit/e4c34b1e22a532dea42b03623eef6f34ff48e864
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Fix PMD violations #327	https://github.com/wncoder/java-design-patterns/commit/5f033be54fef0976fd874381591a527c19059286
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Adjust checkstyle rules. Make checkstyle fail the build when violations are found. Correct all current checkstyle violations.	https://github.com/wncoder/java-design-patterns/commit/cec9a99410a0544ff0f1a5853443ef9dcff0a9e7
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[refactor] Remove unnecessary declarations in observer pattern.	https://github.com/wncoder/java-design-patterns/commit/33cd28f7cd1518c54b9307ce668f6d25e612f1b3
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Added unit tests for each of the patterns.	https://github.com/wncoder/java-design-patterns/commit/6301e0bc111e280374f0589495e1313fbd77736e
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	https://github.com/iluwatar
iluwatar	https://github.com/wncoder/java-design-patterns/commits?author=iluwatar
3bc005f	https://github.com/wncoder/java-design-patterns/commit/3bc005f4b7bfb4411376998af1c72865423f0864
	https://github.com/wncoder/java-design-patterns/blob/3bc005f4b7bfb4411376998af1c72865423f0864/observer/src
	https://github.com/wncoder/java-design-patterns/tree/3bc005f4b7bfb4411376998af1c72865423f0864
added observer sample	https://github.com/wncoder/java-design-patterns/commit/b3d48cc4dfa07c33ae2235ac2a701e2bded62fa4
	https://github.com/iluwatar
iluwatar	https://github.com/wncoder/java-design-patterns/commits?author=iluwatar
b3d48cc	https://github.com/wncoder/java-design-patterns/commit/b3d48cc4dfa07c33ae2235ac2a701e2bded62fa4
	https://github.com/wncoder/java-design-patterns/blob/b3d48cc4dfa07c33ae2235ac2a701e2bded62fa4/observer/src
	https://github.com/wncoder/java-design-patterns/tree/b3d48cc4dfa07c33ae2235ac2a701e2bded62fa4
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