Simplify some code

See gh-18077

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/health/IncludeExcludeGroupMemberPredicate.java

@@ -54,10 +54,7 @@ class IncludeExcludeGroupMemberPredicate implements Predicate<String> {
 		if (names == null) {
 			return Collections.emptySet();
 		}
-		Set<String> cleaned = new LinkedHashSet<>(names.size());
-		for (String name : names) {
-			cleaned.add(name);
-		}
+		Set<String> cleaned = new LinkedHashSet<>(names);
 		return Collections.unmodifiableSet(cleaned);
 	}
 

spring-boot-project/spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/web/servlet/SpringBootMockMvcBuilderCustomizerTests.java

@@ -109,10 +109,7 @@ class SpringBootMockMvcBuilderCustomizerTests {
 
 		@Override
 		public void write(List<String> lines) {
-			List<String> written = new ArrayList<>();
-			for (String line : lines) {
-				written.add(line);
-			}
+			List<String> written = new ArrayList<>(lines);
 			synchronized (this.monitor) {
 				this.allWritten.add(written);
 			}