Use pattern variables

See gh-39259

Author: tobias-lippert

buildSrc/src/main/java/org/springframework/boot/build/bom/bomr/version/ReleaseTrainDependencyVersion.java

@@ -64,10 +64,9 @@ public int compareTo(DependencyVersion other) {
 
 	@Override
 	public boolean isUpgrade(DependencyVersion candidate, boolean movingToSnapshots) {
-		if (!(candidate instanceof ReleaseTrainDependencyVersion)) {
+		if (!(candidate instanceof ReleaseTrainDependencyVersion candidateReleaseTrain)) {
 			return true;
 		}
-		ReleaseTrainDependencyVersion candidateReleaseTrain = (ReleaseTrainDependencyVersion) candidate;
 		int comparison = this.releaseTrain.compareTo(candidateReleaseTrain.releaseTrain);
 		if (comparison != 0) {
 			return comparison < 0;
@@ -88,10 +87,9 @@ private boolean isSnapshot() {
 
 	@Override
 	public boolean isSnapshotFor(DependencyVersion candidate) {
-		if (!isSnapshot() || !(candidate instanceof ReleaseTrainDependencyVersion)) {
+		if (!isSnapshot() || !(candidate instanceof ReleaseTrainDependencyVersion candidateReleaseTrain)) {
 			return false;
 		}
-		ReleaseTrainDependencyVersion candidateReleaseTrain = (ReleaseTrainDependencyVersion) candidate;
 		return this.releaseTrain.equals(candidateReleaseTrain.releaseTrain);
 	}
 

spring-boot-project/spring-boot-tools/spring-boot-properties-migrator/src/main/java/org/springframework/boot/context/properties/migrator/PropertiesMigrationReporter.java

@@ -127,8 +127,7 @@ private Map<String, List<PropertyMigration>> getMatchingProperties(
 						new PropertyMigration(match, metadata, determineReplacementMetadata(metadata), false));
 			}
 			// Prefix match for maps
-			if (isMapType(metadata) && propertySource instanceof IterableConfigurationPropertySource) {
-				IterableConfigurationPropertySource iterableSource = (IterableConfigurationPropertySource) propertySource;
+			if (isMapType(metadata) && propertySource instanceof IterableConfigurationPropertySource iterableSource) {
 				iterableSource.stream()
 					.filter(metadataName::isAncestorOf)
 					.map(propertySource::getConfigurationProperty)