diff --git a/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/OnClassCondition.java b/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/OnClassCondition.java
index c1659c1af4c..e28bba5bd27 100644
--- a/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/OnClassCondition.java
+++ b/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/OnClassCondition.java
@@ -16,6 +16,7 @@
 
 package org.springframework.boot.autoconfigure.condition;
 
+import java.util.Collections;
 import java.util.Iterator;
 import java.util.LinkedList;
 import java.util.List;
@@ -101,9 +102,7 @@ class OnClassCondition extends SpringBootCondition {
 	private void addAll(List<String> list, List<Object> itemsToAdd) {
 		if (itemsToAdd != null) {
 			for (Object item : itemsToAdd) {
-				for (String arrayItem : (String[]) item) {
-					list.add(arrayItem.toString());
-				}
+				Collections.addAll(list, (String[]) item);
 			}
 		}
 	}
diff --git a/spring-boot/src/main/java/org/springframework/boot/SpringApplication.java b/spring-boot/src/main/java/org/springframework/boot/SpringApplication.java
index 098d8e4450b..1d7cb617861 100644
--- a/spring-boot/src/main/java/org/springframework/boot/SpringApplication.java
+++ b/spring-boot/src/main/java/org/springframework/boot/SpringApplication.java
@@ -455,12 +455,9 @@ public class SpringApplication {
 	 * @see #configureEnvironment(ConfigurableEnvironment, String[])
 	 */
 	protected void configureProfiles(ConfigurableEnvironment environment, String[] args) {
-		Set<String> profiles = new LinkedHashSet<String>();
 		environment.getActiveProfiles(); // ensure they are initialized
 		// But these ones should go first (last wins in a property key clash)
-		for (String profile : this.profiles) {
-			profiles.add(profile);
-		}
+		Set<String> profiles = new LinkedHashSet<String>(this.profiles);
 		profiles.addAll(Arrays.asList(environment.getActiveProfiles()));
 		environment.setActiveProfiles(profiles.toArray(new String[profiles.size()]));
 	}
diff --git a/spring-boot/src/test/java/org/springframework/boot/context/web/SpringBootServletInitializerTests.java b/spring-boot/src/test/java/org/springframework/boot/context/web/SpringBootServletInitializerTests.java
index 96c80438e14..34a0f525ac4 100644
--- a/spring-boot/src/test/java/org/springframework/boot/context/web/SpringBootServletInitializerTests.java
+++ b/spring-boot/src/test/java/org/springframework/boot/context/web/SpringBootServletInitializerTests.java
@@ -16,6 +16,7 @@
 
 package org.springframework.boot.context.web;
 
+import java.util.Collections;
 import java.util.LinkedHashSet;
 import java.util.Set;
 
@@ -73,9 +74,7 @@ public class SpringBootServletInitializerTests {
 
 	private Matcher<? super Set<Object>> equalToSet(Object... items) {
 		Set<Object> set = new LinkedHashSet<Object>();
-		for (Object item : items) {
-			set.add(item);
-		}
+		Collections.addAll(set, items);
 		return equalTo(set);
 	}