Polish (Linked)HashSet usage

See gh-32291

spring-context/src/main/java/org/springframework/context/annotation/ConfigurationClassParser.java

@@ -25,6 +25,7 @@ import java.util.Collections;
 import java.util.Comparator;
 import java.util.Deque;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.Iterator;
 import java.util.LinkedHashMap;
 import java.util.LinkedHashSet;
@@ -494,12 +495,11 @@ class ConfigurationClassParser {
 	}
 
 	/**
-	 * Returns {@code @Import} class, considering all meta-annotations.
+	 * Returns {@code @Import} classes, considering all meta-annotations.
 	 */
 	private Set<SourceClass> getImports(SourceClass sourceClass) throws IOException {
 		Set<SourceClass> imports = new LinkedHashSet<>();
-		Set<SourceClass> visited = new LinkedHashSet<>();
-		collectImports(sourceClass, imports, visited);
+		collectImports(sourceClass, imports, new HashSet<>());
 		return imports;
 	}
 
@@ -1038,7 +1038,7 @@ class ConfigurationClassParser {
 				return Collections.emptySet();
 			}
 			String[] classNames = (String[]) annotationAttributes.get(attribute);
-			Set<SourceClass> result = new LinkedHashSet<>();
+			Set<SourceClass> result = CollectionUtils.newLinkedHashSet(classNames.length);
 			for (String className : classNames) {
 				result.add(getRelated(className));
 			}

spring-context/src/main/java/org/springframework/context/aot/RuntimeHintsBeanFactoryInitializationAotProcessor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -36,6 +36,7 @@ import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
 import org.springframework.context.annotation.ImportRuntimeHints;
 import org.springframework.core.log.LogMessage;
 import org.springframework.lang.Nullable;
+import org.springframework.util.CollectionUtils;
 
 /**
  * {@link BeanFactoryInitializationAotProcessor} implementation that processes
@@ -76,8 +77,9 @@ class RuntimeHintsBeanFactoryInitializationAotProcessor implements BeanFactoryIn
 	private Set<Class<? extends RuntimeHintsRegistrar>> extractFromBeanDefinition(String beanName,
 			ImportRuntimeHints annotation) {
 
-		Set<Class<? extends RuntimeHintsRegistrar>> registrars = new LinkedHashSet<>();
-		for (Class<? extends RuntimeHintsRegistrar> registrarClass : annotation.value()) {
+		Class<? extends RuntimeHintsRegistrar>[] registrarClasses = annotation.value();
+		Set<Class<? extends RuntimeHintsRegistrar>> registrars = CollectionUtils.newLinkedHashSet(registrarClasses.length);
+		for (Class<? extends RuntimeHintsRegistrar> registrarClass : registrarClasses) {
 			if (logger.isTraceEnabled()) {
 				logger.trace(LogMessage.format("Loaded [%s] registrar from annotated bean [%s]",
 						registrarClass.getCanonicalName(), beanName));

spring-core/src/main/java/org/springframework/aot/hint/BindingReflectionHintsRegistrar.java

@@ -22,6 +22,7 @@ import java.lang.reflect.Field;
 import java.lang.reflect.Method;
 import java.lang.reflect.RecordComponent;
 import java.lang.reflect.Type;
+import java.util.HashSet;
 import java.util.LinkedHashSet;
 import java.util.Set;
 import java.util.function.Consumer;
@@ -63,7 +64,7 @@ public class BindingReflectionHintsRegistrar {
 	 * @param types the types to register
 	 */
 	public void registerReflectionHints(ReflectionHints hints, Type... types) {
-		Set<Type> seen = new LinkedHashSet<>();
+		Set<Type> seen = new HashSet<>();
 		for (Type type : types) {
 			registerReflectionHints(hints, seen, type);
 		}

spring-orm/src/main/java/org/springframework/orm/jpa/persistenceunit/PersistenceManagedTypesScanner.java

@@ -21,7 +21,6 @@ import java.io.IOException;
 import java.net.URL;
 import java.util.ArrayList;
 import java.util.HashSet;
-import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Set;
 
@@ -46,6 +45,7 @@ import org.springframework.core.type.filter.AnnotationTypeFilter;
 import org.springframework.core.type.filter.TypeFilter;
 import org.springframework.lang.Nullable;
 import org.springframework.util.ClassUtils;
+import org.springframework.util.CollectionUtils;
 import org.springframework.util.ResourceUtils;
 
 /**
@@ -66,7 +66,7 @@ public final class PersistenceManagedTypesScanner {
 	private static final boolean shouldIgnoreClassFormatException =
 			SpringProperties.getFlag(IGNORE_CLASSFORMAT_PROPERTY_NAME);
 
-	private static final Set<AnnotationTypeFilter> entityTypeFilters = new LinkedHashSet<>(4);
+	private static final Set<AnnotationTypeFilter> entityTypeFilters = CollectionUtils.newLinkedHashSet(4);
 
 	static {
 		entityTypeFilters.add(new AnnotationTypeFilter(Entity.class, false));

spring-test/src/main/java/org/springframework/mock/web/MockServletContext.java

@@ -93,7 +93,7 @@ public class MockServletContext implements ServletContext {
 
 	private static final String TEMP_DIR_SYSTEM_PROPERTY = "java.io.tmpdir";
 
-	private static final Set<SessionTrackingMode> DEFAULT_SESSION_TRACKING_MODES = new LinkedHashSet<>(4);
+	private static final Set<SessionTrackingMode> DEFAULT_SESSION_TRACKING_MODES = CollectionUtils.newLinkedHashSet(3);
 
 	static {
 		DEFAULT_SESSION_TRACKING_MODES.add(SessionTrackingMode.COOKIE);

spring-test/src/main/java/org/springframework/test/context/TestContextManager.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -20,7 +20,6 @@ import java.lang.reflect.Constructor;
 import java.lang.reflect.Method;
 import java.util.ArrayList;
 import java.util.Collections;
-import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Set;
 
@@ -29,6 +28,7 @@ import org.apache.commons.logging.LogFactory;
 
 import org.springframework.lang.Nullable;
 import org.springframework.util.ClassUtils;
+import org.springframework.util.CollectionUtils;
 import org.springframework.util.ReflectionUtils;
 
 /**
@@ -92,7 +92,7 @@ public class TestContextManager {
 
 	private static final Log logger = LogFactory.getLog(TestContextManager.class);
 
-	private static final Set<Class<? extends Throwable>> skippedExceptionTypes = new LinkedHashSet<>(4);
+	private static final Set<Class<? extends Throwable>> skippedExceptionTypes = CollectionUtils.newLinkedHashSet(3);
 
 	static {
 		// JUnit Jupiter

spring-web/src/testFixtures/java/org/springframework/web/testfixture/servlet/MockServletContext.java

@@ -93,7 +93,7 @@ public class MockServletContext implements ServletContext {
 
 	private static final String TEMP_DIR_SYSTEM_PROPERTY = "java.io.tmpdir";
 
-	private static final Set<SessionTrackingMode> DEFAULT_SESSION_TRACKING_MODES = new LinkedHashSet<>(4);
+	private static final Set<SessionTrackingMode> DEFAULT_SESSION_TRACKING_MODES = CollectionUtils.newLinkedHashSet(3);
 
 	static {
 		DEFAULT_SESSION_TRACKING_MODES.add(SessionTrackingMode.COOKIE);