diff --git a/src/main/java/org/apache/commons/lang3/builder/DiffBuilder.java b/src/main/java/org/apache/commons/lang3/builder/DiffBuilder.java
index 183a0450a..b2dd21269 100644
--- a/src/main/java/org/apache/commons/lang3/builder/DiffBuilder.java
+++ b/src/main/java/org/apache/commons/lang3/builder/DiffBuilder.java
@@ -948,19 +948,13 @@ public class DiffBuilder<T> implements Builder<DiffResult<T>> {
      * @throws NullPointerException if field name is {@code null}
      * @since 3.5
      */
-    public DiffBuilder<T> append(final String fieldName,
-            final DiffResult<T> diffResult) {
+    public DiffBuilder<T> append(final String fieldName, final DiffResult<T> diffResult) {
         validateFieldNameNotNull(fieldName);
         Validate.notNull(diffResult, "diffResult");
         if (objectsTriviallyEqual) {
             return this;
         }
-
-        for (final Diff<?> diff : diffResult.getDiffs()) {
-            append(fieldName + "." + diff.getFieldName(),
-                   diff.getLeft(), diff.getRight());
-        }
-
+        diffResult.getDiffs().forEach(diff -> append(fieldName + "." + diff.getFieldName(), diff.getLeft(), diff.getRight()));
         return this;
     }
 
diff --git a/src/main/java/org/apache/commons/lang3/builder/DiffResult.java b/src/main/java/org/apache/commons/lang3/builder/DiffResult.java
index df1ec7e5b..9c3f5fcf3 100644
--- a/src/main/java/org/apache/commons/lang3/builder/DiffResult.java
+++ b/src/main/java/org/apache/commons/lang3/builder/DiffResult.java
@@ -197,13 +197,12 @@ public class DiffResult<T> implements Iterable<Diff<?>> {
         final ToStringBuilder lhsBuilder = new ToStringBuilder(lhs, style);
         final ToStringBuilder rhsBuilder = new ToStringBuilder(rhs, style);
 
-        for (final Diff<?> diff : diffList) {
+        diffList.forEach(diff -> {
             lhsBuilder.append(diff.getFieldName(), diff.getLeft());
             rhsBuilder.append(diff.getFieldName(), diff.getRight());
-        }
+        });
 
-        return String.format("%s %s %s", lhsBuilder.build(), DIFFERS_STRING,
-                rhsBuilder.build());
+        return String.format("%s %s %s", lhsBuilder.build(), DIFFERS_STRING, rhsBuilder.build());
     }
 
     /**
diff --git a/src/main/java/org/apache/commons/lang3/concurrent/MultiBackgroundInitializer.java b/src/main/java/org/apache/commons/lang3/concurrent/MultiBackgroundInitializer.java
index 9ce572d5a..e08552099 100644
--- a/src/main/java/org/apache/commons/lang3/concurrent/MultiBackgroundInitializer.java
+++ b/src/main/java/org/apache/commons/lang3/concurrent/MultiBackgroundInitializer.java
@@ -98,9 +98,9 @@ import org.apache.commons.lang3.Validate;
 public class MultiBackgroundInitializer
         extends
         BackgroundInitializer<MultiBackgroundInitializer.MultiBackgroundInitializerResults> {
+
     /** A map with the child initializers. */
-    private final Map<String, BackgroundInitializer<?>> childInitializers =
-        new HashMap<>();
+    private final Map<String, BackgroundInitializer<?>> childInitializers = new HashMap<>();
 
     /**
      * Creates a new instance of {@link MultiBackgroundInitializer}.
@@ -156,13 +156,7 @@ public class MultiBackgroundInitializer
      */
     @Override
     protected int getTaskCount() {
-        int result = 1;
-
-        for (final BackgroundInitializer<?> bi : childInitializers.values()) {
-            result += bi.getTaskCount();
-        }
-
-        return result;
+        return 1 + childInitializers.values().stream().mapToInt(BackgroundInitializer::getTaskCount).sum();
     }
 
     /**
@@ -180,30 +174,29 @@ public class MultiBackgroundInitializer
         final Map<String, BackgroundInitializer<?>> inits;
         synchronized (this) {
             // create a snapshot to operate on
-            inits = new HashMap<>(
-                    childInitializers);
+            inits = new HashMap<>(childInitializers);
         }
 
         // start the child initializers
         final ExecutorService exec = getActiveExecutor();
-        for (final BackgroundInitializer<?> bi : inits.values()) {
+        inits.values().forEach(bi -> {
             if (bi.getExternalExecutor() == null) {
                 // share the executor service if necessary
                 bi.setExternalExecutor(exec);
             }
             bi.start();
-        }
+        });
 
         // collect the results
         final Map<String, Object> results = new HashMap<>();
         final Map<String, ConcurrentException> excepts = new HashMap<>();
-        for (final Map.Entry<String, BackgroundInitializer<?>> e : inits.entrySet()) {
+        inits.entrySet().forEach(e -> {
             try {
                 results.put(e.getKey(), e.getValue().get());
             } catch (final ConcurrentException cex) {
                 excepts.put(e.getKey(), cex);
             }
-        }
+        });
 
         return new MultiBackgroundInitializerResults(inits, results, excepts);
     }