Simplify if-statements with instanceof checks

Closes gh-25449

spring-beans/src/testFixtures/java/org/springframework/beans/testfixture/beans/TestBean.java

@@ -469,7 +469,7 @@ public class TestBean implements BeanNameAware, BeanFactoryAware, ITestBean, IOt
 		if (this == other) {
 			return true;
 		}
-		if (other == null || !(other instanceof TestBean)) {
+		if (!(other instanceof TestBean)) {
 			return false;
 		}
 		TestBean tb2 = (TestBean) other;

spring-context-indexer/src/main/java/org/springframework/context/index/processor/TypeHelper.java

@@ -63,7 +63,7 @@ class TypeHelper {
 		if (type instanceof DeclaredType) {
 			DeclaredType declaredType = (DeclaredType) type;
 			Element enclosingElement = declaredType.asElement().getEnclosingElement();
-			if (enclosingElement != null && enclosingElement instanceof TypeElement) {
+			if (enclosingElement instanceof TypeElement) {
 				return getQualifiedName(enclosingElement) + "$" + declaredType.asElement().getSimpleName().toString();
 			}
 			else {

spring-context/src/main/java/org/springframework/cache/annotation/SpringCacheAnnotationParser.java

@@ -223,7 +223,7 @@ public class SpringCacheAnnotationParser implements CacheAnnotationParser, Seria
 
 	@Override
 	public boolean equals(@Nullable Object other) {
-		return (this == other || other instanceof SpringCacheAnnotationParser);
+		return (other instanceof SpringCacheAnnotationParser);
 	}
 
 	@Override

spring-expression/src/main/java/org/springframework/expression/spel/ast/OperatorInstanceof.java

@@ -62,7 +62,7 @@ public class OperatorInstanceof extends Operator {
 		Object leftValue = left.getValue();
 		Object rightValue = right.getValue();
 		BooleanTypedValue result;
-		if (rightValue == null || !(rightValue instanceof Class)) {
+		if (!(rightValue instanceof Class)) {
 			throw new SpelEvaluationException(getRightOperand().getStartPosition(),
 					SpelMessage.INSTANCEOF_OPERATOR_NEEDS_CLASS_OPERAND,
 					(rightValue == null ? "null" : rightValue.getClass().getName()));

spring-test/src/main/java/org/springframework/test/context/web/AbstractGenericWebContextLoader.java

@@ -181,7 +181,7 @@ public abstract class AbstractGenericWebContextLoader extends AbstractContextLoa
 
 		// If the WebApplicationContext has no parent or the parent is not a WebApplicationContext,
 		// set the current context as the root WebApplicationContext:
-		if (parent == null || (!(parent instanceof WebApplicationContext))) {
+		if (!(parent instanceof WebApplicationContext)) {
 			String resourceBasePath = webMergedConfig.getResourceBasePath();
 			ResourceLoader resourceLoader = (resourceBasePath.startsWith(ResourceLoader.CLASSPATH_URL_PREFIX) ?
 					new DefaultResourceLoader() : new FileSystemResourceLoader());

spring-tx/src/main/java/org/springframework/transaction/annotation/Ejb3TransactionAnnotationParser.java

@@ -61,7 +61,7 @@ public class Ejb3TransactionAnnotationParser implements TransactionAnnotationPar
 
 	@Override
 	public boolean equals(@Nullable Object other) {
-		return (this == other || other instanceof Ejb3TransactionAnnotationParser);
+		return (other instanceof Ejb3TransactionAnnotationParser);
 	}
 
 	@Override

spring-tx/src/main/java/org/springframework/transaction/annotation/JtaTransactionAnnotationParser.java

@@ -82,7 +82,7 @@ public class JtaTransactionAnnotationParser implements TransactionAnnotationPars
 
 	@Override
 	public boolean equals(@Nullable Object other) {
-		return (this == other || other instanceof JtaTransactionAnnotationParser);
+		return (other instanceof JtaTransactionAnnotationParser);
 	}
 
 	@Override

spring-tx/src/main/java/org/springframework/transaction/annotation/SpringTransactionAnnotationParser.java

@@ -104,7 +104,7 @@ public class SpringTransactionAnnotationParser implements TransactionAnnotationP
 
 	@Override
 	public boolean equals(@Nullable Object other) {
-		return (this == other || other instanceof SpringTransactionAnnotationParser);
+		return (other instanceof SpringTransactionAnnotationParser);
 	}
 
 	@Override

spring-web/src/main/java/org/springframework/web/util/pattern/PathPattern.java

@@ -167,8 +167,7 @@ public class PathPattern implements Comparable<PathPattern> {
 			if (elem instanceof CaptureTheRestPathElement || elem instanceof WildcardTheRestPathElement) {
 				this.catchAll = true;
 			}
-			if (elem instanceof SeparatorPathElement && elem.next != null &&
-					elem.next instanceof WildcardPathElement && elem.next.next == null) {
+			if (elem instanceof SeparatorPathElement && elem.next instanceof WildcardPathElement && elem.next.next == null) {
 				this.endsWithSeparatorWildcard = true;
 			}
 			elem = elem.next;

spring-websocket/src/main/java/org/springframework/web/socket/config/WebSocketMessageBrokerStats.java

@@ -96,7 +96,7 @@ public class WebSocketMessageBrokerStats {
 			}
 		}
 		SubProtocolHandler defaultHandler = this.webSocketHandler.getDefaultProtocolHandler();
-		if (defaultHandler != null && defaultHandler instanceof StompSubProtocolHandler) {
+		if (defaultHandler instanceof StompSubProtocolHandler) {
 			return (StompSubProtocolHandler) defaultHandler;
 		}
 		return null;