Instead of pair `HashMap.containsKey`/`HashMap.get` method calls, we can use single call `HashMap.getOrDefault`. It's faster and clearer.
------------- Commit messages: - [PATCH] Avoid redundant HashMap.containsKey calls in ZoneInfoFile Changes: https://git.openjdk.java.net/jdk/pull/8487/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8487&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8287053 Stats: 6 lines in 1 file changed: 0 ins; 3 del; 3 mod Patch: https://git.openjdk.java.net/jdk/pull/8487.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/8487/head:pull/8487 PR: https://git.openjdk.java.net/jdk/pull/8487
