diff --git a/src/main/java/org/apache/commons/lang3/BooleanUtils.java b/src/main/java/org/apache/commons/lang3/BooleanUtils.java
index bad27b667..9b2bd117a 100644
--- a/src/main/java/org/apache/commons/lang3/BooleanUtils.java
+++ b/src/main/java/org/apache/commons/lang3/BooleanUtils.java
@@ -263,7 +263,7 @@ public class BooleanUtils {
     public static boolean oneHot(final boolean... array) {
         ObjectUtils.requireNonEmpty(array, "array");
         boolean result = false;
-        for (boolean element: array) {
+        for (final boolean element: array) {
             if (element) {
                 if (result) {
                     return false;
diff --git a/src/main/java/org/apache/commons/lang3/CharSet.java b/src/main/java/org/apache/commons/lang3/CharSet.java
index 731c9c297..e3b4728ae 100644
--- a/src/main/java/org/apache/commons/lang3/CharSet.java
+++ b/src/main/java/org/apache/commons/lang3/CharSet.java
@@ -22,6 +22,7 @@ import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Map;
 import java.util.Set;
+import java.util.stream.Stream;
 
 /**
  * <p>A set of characters.</p>
@@ -172,9 +173,7 @@ public class CharSet implements Serializable {
      * @throws NullPointerException if set is {@code null}
      */
     protected CharSet(final String... set) {
-        for (final String s : set) {
-            add(s);
-        }
+        Stream.of(set).forEach(this::add);
     }
 
     /**
diff --git a/src/main/java/org/apache/commons/lang3/CharSetUtils.java b/src/main/java/org/apache/commons/lang3/CharSetUtils.java
index 30d83b7ff..733423dd1 100644
--- a/src/main/java/org/apache/commons/lang3/CharSetUtils.java
+++ b/src/main/java/org/apache/commons/lang3/CharSetUtils.java
@@ -16,6 +16,8 @@
  */
 package org.apache.commons.lang3;
 
+import org.apache.commons.lang3.stream.Streams;
+
 /**
  * <p>Operations on {@link CharSet} instances.</p>
  *
@@ -101,14 +103,7 @@ public class CharSetUtils {
      * @return whether or not the String is empty
      */
     private static boolean deepEmpty(final String[] strings) {
-        if (strings != null) {
-            for (final String s : strings) {
-                if (StringUtils.isNotEmpty(s)) {
-                    return false;
-                }
-            }
-        }
-        return true;
+        return Streams.of(strings).allMatch(StringUtils::isEmpty);
     }
 
     /**
diff --git a/src/main/java/org/apache/commons/lang3/time/DurationFormatUtils.java b/src/main/java/org/apache/commons/lang3/time/DurationFormatUtils.java
index 44156bd7e..88fcdd1ac 100644
--- a/src/main/java/org/apache/commons/lang3/time/DurationFormatUtils.java
+++ b/src/main/java/org/apache/commons/lang3/time/DurationFormatUtils.java
@@ -22,6 +22,7 @@ import java.util.Calendar;
 import java.util.Date;
 import java.util.GregorianCalendar;
 import java.util.TimeZone;
+import java.util.stream.Stream;
 
 import org.apache.commons.lang3.StringUtils;
 import org.apache.commons.lang3.Validate;
@@ -578,12 +579,7 @@ public class DurationFormatUtils {
          * @return boolean {@code true} if contained
          */
         static boolean containsTokenWithValue(final Token[] tokens, final Object value) {
-            for (final Token token : tokens) {
-                if (token.getValue() == value) {
-                    return true;
-                }
-            }
-            return false;
+            return Stream.of(tokens).anyMatch(token -> token.getValue() == value);
         }
 
         private final Object value;