diff --git a/src/main/java/xyz/zhouxy/plusone/commons/collection/AbstractMapWrapper.java b/src/main/java/xyz/zhouxy/plusone/commons/collection/AbstractMapWrapper.java
index f8a9d21..bd9c967 100644
--- a/src/main/java/xyz/zhouxy/plusone/commons/collection/AbstractMapWrapper.java
+++ b/src/main/java/xyz/zhouxy/plusone/commons/collection/AbstractMapWrapper.java
@@ -20,6 +20,7 @@ import java.util.Collection;
 import java.util.Collections;
 import java.util.Map;
 import java.util.Map.Entry;
+import java.util.Objects;
 import java.util.Optional;
 import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
@@ -166,6 +167,24 @@ public abstract class AbstractMapWrapper<K, V, T extends AbstractMapWrapper<K, V
         return this.map.toString();
     }
 
+    @Override
+    public int hashCode() {
+        return Objects.hash(map);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (getClass() != obj.getClass())
+            return false;
+        @SuppressWarnings("rawtypes")
+        AbstractMapWrapper other = (AbstractMapWrapper) obj;
+        return Objects.equals(map, other.map);
+    }
+
     public abstract static class Builder<K, V, T extends AbstractMapWrapper<K, V, T>> {
         protected final Map<K, V> map;
         protected Consumer<K> keyChecker;