Polish some Collectors

See gh-13727

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/endpoint/ExposeExcludePropertyEndpointFilter.java

@@ -20,7 +20,6 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
-import java.util.HashSet;
 import java.util.Locale;
 import java.util.Set;
 import java.util.stream.Collectors;
@@ -83,7 +82,7 @@ public class ExposeExcludePropertyEndpointFilter<E extends ExposableEndpoint<?>>
 			return Collections.emptySet();
 		}
 		return items.stream().map((item) -> item.toLowerCase(Locale.ENGLISH))
-				.collect(Collectors.toCollection(HashSet::new));
+				.collect(Collectors.toSet());
 	}
 
 	@Override

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/MetricsEndpoint.java

@@ -158,7 +158,7 @@ public class MetricsEndpoint {
 	private <K, V, T> List<T> asList(Map<K, V> map, BiFunction<K, V, T> mapper) {
 		return map.entrySet().stream()
 				.map((entry) -> mapper.apply(entry.getKey(), entry.getValue()))
-				.collect(Collectors.toCollection(ArrayList::new));
+				.collect(Collectors.toList());
 	}
 
 	/**

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/AutoConfigurations.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2018 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,7 +16,6 @@
 
 package org.springframework.boot.autoconfigure;
 
-import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.List;
@@ -48,11 +47,11 @@ public class AutoConfigurations extends Configurations implements Ordered {
 	@Override
 	protected Collection<Class<?>> sort(Collection<Class<?>> classes) {
 		List<String> names = classes.stream().map(Class::getName)
-				.collect(Collectors.toCollection(ArrayList::new));
+				.collect(Collectors.toList());
 		List<String> sorted = SORTER.getInPriorityOrder(names);
 		return sorted.stream()
 				.map((className) -> ClassUtils.resolveClassName(className, null))
-				.collect(Collectors.toCollection(ArrayList::new));
+				.collect(Collectors.toList());
 	}
 
 	@Override