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 f1e6bc2..990474f 100644
--- a/src/main/java/xyz/zhouxy/plusone/commons/collection/AbstractMapWrapper.java
+++ b/src/main/java/xyz/zhouxy/plusone/commons/collection/AbstractMapWrapper.java
@@ -57,9 +57,7 @@ public abstract class AbstractMapWrapper<K, V, T extends AbstractMapWrapper<K, V
     }
 
     public final T putAll(Map<? extends K, ? extends V> m) {
-        for (Entry<? extends K, ? extends V> entry : m.entrySet()) {
-            put(entry.getKey(), entry.getValue());
-        }
+        m.forEach(this::put);
         return getSelf();
     }
 
@@ -183,9 +181,7 @@ public abstract class AbstractMapWrapper<K, V, T extends AbstractMapWrapper<K, V
         }
 
         public Builder<K, V, T> putAll(Map<? extends K, ? extends V> m) {
-            for (Entry<? extends K, ? extends V> entry : m.entrySet()) {
-                put(entry.getKey(), entry.getValue());
-            }
+            m.forEach(this::put);
             return this;
         }
 
diff --git a/src/main/java/xyz/zhouxy/plusone/commons/util/PreconditionsExt.java b/src/main/java/xyz/zhouxy/plusone/commons/util/PreconditionsExt.java
index f18b0e4..c6ffbec 100644
--- a/src/main/java/xyz/zhouxy/plusone/commons/util/PreconditionsExt.java
+++ b/src/main/java/xyz/zhouxy/plusone/commons/util/PreconditionsExt.java
@@ -16,6 +16,7 @@
 
 package xyz.zhouxy.plusone.commons.util;
 
+import java.util.Arrays;
 import java.util.function.Supplier;
 
 import com.google.common.base.Preconditions;
@@ -37,17 +38,13 @@ public class PreconditionsExt {
 
     public static <T, E extends Throwable> void checkAllNotNull(Iterable<T> values) throws E {
         Preconditions.checkNotNull(values);
-        for (T item : values) {
-            Preconditions.checkNotNull(item);
-        }
+        values.forEach(Preconditions::checkNotNull);
     }
 
     @SafeVarargs
     public static <T, E extends Throwable> void checkAllNotNull(T... values) throws E {
         Preconditions.checkNotNull(values);
-        for (T item : values) {
-            Preconditions.checkNotNull(item);
-        }
+        Arrays.stream(values).forEach(Preconditions::checkNotNull);
     }
 
     private PreconditionsExt() {