Replace Integer with Item class
fix imports
add MapTest.testConcurrentAccess
use more tactful language
never run testBug8186171 on jdk older than jdk10
tweak the "for" loop to make it look less like a lambda
8222930: ConcurrentSkipListMap.clone() shares size variable between original and clone
improve testBug8210280
Add missing test found while investigating JDK-8210280
fix "dangling" javadoc comments
8186171: HashMap: Entry.setValue may not work after Iterator.remove() called for previous entries
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