update to using jdk11 by default, except link to jdk10 javadocs;
sync @docRoot references in javadoc with upstream

drainTo(Collection) should delegate to drainTo(Collection, int) as done elsewhere

convert to Objects.requireNonNull

compare longs against 0L, not 0

bytecode golf

never use wildcard imports

remove redundant initializations to null or 0

Waiting threads should not retain a reference to the first task in queue

use blessed modifier order

no blank line between javadoc and corresponding code

whitespace

make drainTo methods more robust when c.add throws

fix javac 7 [rawtypes] warnings

Update Creative Commons license URL in legal notices

Sync with OpenJDK; whitespace

6609775: Reduce context switches in DelayQueue due to signalAll

Location of Collections Guide has changed

Incorporate review suggestions

Use snapshot iterators

Fix timed poll

doc fixes

Clarify specs

Avoid generics warnings; clarify javadocs

doc fixes

E o -> E e

CopyOnWriteArraySet and ConcurrentHashMap no longer implement Cloneable
Improve javadoc wording in other classes

Override javadoc specs when overriding AbstractQueue implementations
Clarify atomicity in BlockingQueue

javadoc lint; Thread.interrupt shouldn't throw exception if thread dead

Adapt to AbstractQueuedSynchronizer

Changed doc strings for generic params

Redeclare some Conditions as ReentrantLock.ConditionObjects

Fix some javadoc inconsistencies

Adapt AbstractQueue changes; Conditionalize CancellableTask.reset; new TimeUnit methods

ScheduledExecutor must prestart core threads

Misc doc touch-ups

Clarify iterator semantics

Add Collection constructor, fix typo

Added missing javadoc tags; minor reformatting

re-check-in initial implementations