src/share/classes/java/util/concurrent/ConcurrentHashMap.java

rev 7682 : 8021591: Additional explicit null checks
Reviewed-by: duke

@@ -48,10 +48,11 @@
 import java.util.HashMap;
 import java.util.Hashtable;
 import java.util.Iterator;
 import java.util.Map;
 import java.util.NoSuchElementException;
+import java.util.Objects;
 import java.util.Set;
 import java.util.Spliterator;
 import java.util.concurrent.ConcurrentMap;
 import java.util.concurrent.ForkJoinPool;
 import java.util.concurrent.atomic.AtomicReference;

@@ -4409,10 +4410,11 @@
             }
             return true;
         }
 
         public final boolean removeAll(Collection<?> c) {
+            Objects.requireNonNull(c);
             boolean modified = false;
             for (Iterator<E> it = iterator(); it.hasNext();) {
                 if (c.contains(it.next())) {
                     it.remove();
                     modified = true;

@@ -4420,10 +4422,11 @@
             }
             return modified;
         }
 
         public final boolean retainAll(Collection<?> c) {
+            Objects.requireNonNull(c);
             boolean modified = false;
             for (Iterator<E> it = iterator(); it.hasNext();) {
                 if (!c.contains(it.next())) {
                     it.remove();
                     modified = true;