Polish AbstractExposableEndpoint

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2022 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.
@@ -16,9 +16,7 @@
 
 package org.springframework.boot.actuate.endpoint;
 
-import java.util.ArrayList;
 import java.util.Collection;
-import java.util.Collections;
 import java.util.List;
 
 import org.springframework.util.Assert;
@@ -34,9 +32,9 @@ public abstract class AbstractExposableEndpoint<O extends Operation> implements
 
 	private final EndpointId id;
 
-	private boolean enabledByDefault;
+	private final boolean enabledByDefault;
 
-	private List<O> operations;
+	private final List<O> operations;
 
 	/**
 	 * Create a new {@link AbstractExposableEndpoint} instance.
@@ -49,7 +47,7 @@ public abstract class AbstractExposableEndpoint<O extends Operation> implements
 		Assert.notNull(operations, "Operations must not be null");
 		this.id = id;
 		this.enabledByDefault = enabledByDefault;
-		this.operations = Collections.unmodifiableList(new ArrayList<>(operations));
+		this.operations = List.copyOf(operations);
 	}
 
 	@Override