Use modern language features in tests

spring-core/src/test/java/org/springframework/core/ParameterizedTypeReferenceTests.java

@@ -34,21 +34,21 @@ class ParameterizedTypeReferenceTests {
 
 	@Test
 	void stringTypeReference() {
-		ParameterizedTypeReference<String> typeReference = new ParameterizedTypeReference<String>() {};
+		ParameterizedTypeReference<String> typeReference = new ParameterizedTypeReference<>() {};
 		assertThat(typeReference.getType()).isEqualTo(String.class);
 	}
 
 	@Test
 	void mapTypeReference() throws Exception {
 		Type mapType = getClass().getMethod("mapMethod").getGenericReturnType();
-		ParameterizedTypeReference<Map<Object,String>> typeReference = new ParameterizedTypeReference<Map<Object,String>>() {};
+		ParameterizedTypeReference<Map<Object,String>> typeReference = new ParameterizedTypeReference<>() {};
 		assertThat(typeReference.getType()).isEqualTo(mapType);
 	}
 
 	@Test
 	void listTypeReference() throws Exception {
 		Type listType = getClass().getMethod("listMethod").getGenericReturnType();
-		ParameterizedTypeReference<List<String>> typeReference = new ParameterizedTypeReference<List<String>>() {};
+		ParameterizedTypeReference<List<String>> typeReference = new ParameterizedTypeReference<>() {};
 		assertThat(typeReference.getType()).isEqualTo(listType);
 	}
 

spring-core/src/test/java/org/springframework/core/convert/converter/DefaultConversionServiceTests.java

@@ -1096,10 +1096,9 @@ class DefaultConversionServiceTests {
 
 		@Override
 		public boolean equals(Object o) {
-			if (!(o instanceof SSN)) {
+			if (!(o instanceof SSN ssn)) {
 				return false;
 			}
-			SSN ssn = (SSN) o;
 			return this.value.equals(ssn.value);
 		}
 
@@ -1137,10 +1136,9 @@ class DefaultConversionServiceTests {
 
 		@Override
 		public boolean equals(Object o) {
-			if (!(o instanceof ISBN)) {
+			if (!(o instanceof ISBN isbn)) {
 				return false;
 			}
-			ISBN isbn = (ISBN) o;
 			return this.value.equals(isbn.value);
 		}
 

spring-core/src/test/java/org/springframework/core/env/CustomEnvironmentTests.java

@@ -75,7 +75,7 @@ class CustomEnvironmentTests {
 			@Override
 			@SuppressWarnings("serial")
 			protected Set<String> getReservedDefaultProfiles() {
-				return new HashSet<String>() {{
+				return new HashSet<>() {{
 						add("rd1");
 						add("rd2");
 				}};

spring-core/src/test/java/org/springframework/core/env/PropertySourceTests.java

@@ -37,10 +37,10 @@ class PropertySourceTests {
 	@Test
 	@SuppressWarnings("serial")
 	void equals() {
-		Map<String, Object> map1 = new HashMap<String, Object>() {{
+		Map<String, Object> map1 = new HashMap<>() {{
 			put("a", "b");
 		}};
-		Map<String, Object> map2 = new HashMap<String, Object>() {{
+		Map<String, Object> map2 = new HashMap<>() {{
 			put("c", "d");
 		}};
 		Properties props1 = new Properties() {{
@@ -69,10 +69,10 @@ class PropertySourceTests {
 	@Test
 	@SuppressWarnings("serial")
 	void collectionsOperations() {
-		Map<String, Object> map1 = new HashMap<String, Object>() {{
+		Map<String, Object> map1 = new HashMap<>() {{
 			put("a", "b");
 		}};
-		Map<String, Object> map2 = new HashMap<String, Object>() {{
+		Map<String, Object> map2 = new HashMap<>() {{
 			put("c", "d");
 		}};
 

spring-core/src/test/java/org/springframework/util/concurrent/FutureAdapterTests.java

@@ -41,7 +41,7 @@ class FutureAdapterTests {
 	@SuppressWarnings("unchecked")
 	void setUp() {
 		adaptee = mock(Future.class);
-		adapter = new FutureAdapter<String, Integer>(adaptee) {
+		adapter = new FutureAdapter<>(adaptee) {
 			@Override
 			protected String adapt(Integer adapteeResult) throws ExecutionException {
 				return adapteeResult.toString();