diff options
| -rw-r--r-- | poi/src/main/java/org/apache/poi/util/BitFieldFactory.java | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/poi/src/main/java/org/apache/poi/util/BitFieldFactory.java b/poi/src/main/java/org/apache/poi/util/BitFieldFactory.java index 4893d5e61b..40e69cb0bd 100644 --- a/poi/src/main/java/org/apache/poi/util/BitFieldFactory.java +++ b/poi/src/main/java/org/apache/poi/util/BitFieldFactory.java @@ -18,13 +18,13 @@ package org.apache.poi.util; -import java.util.*; +import java.util.concurrent.ConcurrentHashMap; /** * Returns immutable Bitfield instances. */ public class BitFieldFactory { - private static Map<Integer, BitField> instances = new HashMap<>(); + private static final ConcurrentHashMap<Integer, BitField> instances = new ConcurrentHashMap<>(); public static BitField getInstance(int mask) { return instances.computeIfAbsent(mask, k -> new BitField(mask)); |