Quick Answer
The correct choice is LinkedHashMap with the `removeEldestEntry` method, as it provides a built-in, elegant mechanism for cache eviction in Java. By overriding `removeEldestEntry`, you can automatically enforce a maximum cache size—the method is invoked after every `put` or `putAll` call, allowing you to return `true` when the map exceeds a threshold, which removes the eldest entry and prevents memory exhaustion. On the Oracle Java Foundations 1Z0-811 exam, this question tests your understanding of how standard library collections can solve real-world memory management problems without custom eviction logic. A common trap is reaching for `HashMap` or manual removal, but `LinkedHashMap`’s insertion-order iteration and automatic eviction make it the optimal choice. Memory tip: think “Eldest Entry Eviction” — the three E’s remind you that `removeEldestEntry` handles eviction elegantly.
This 1Z0-811 practice question tests your understanding of java basics and syntax. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A web application uses a HashMap to cache user session data. The keys are String objects representing session IDs, and values are Session objects. After some time, the cache memory usage grows excessively, causing OutOfMemoryError. The cache is never cleared. The team decides to implement a cache eviction policy. Which approach is best suited for this scenario in terms of Java standard library?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Clue: "never"
Why it matters: Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.
Use WeakHashMap instead of HashMap.
Why wrong: WeakHashMap evicts based on weak references, not time or size.
Wrap the HashMap with Collections.synchronizedMap.
Why wrong: Does not address memory issue.
Use LinkedHashMap with removeEldestEntry method.
LinkedHashMap can implement LRU cache easily.
Use TreeMap with a custom comparator.
Why wrong: TreeMap does not provide eviction.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Use LinkedHashMap with removeEldestEntry method.
Option C is correct because LinkedHashMap provides a straightforward way to implement a cache eviction policy by overriding the `removeEldestEntry` method. This method is automatically called by `put` and `putAll` to decide whether to remove the eldest entry, allowing you to limit the cache size and prevent OutOfMemoryError without manual eviction logic.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Use WeakHashMap instead of HashMap.
Why it's wrong here
WeakHashMap evicts based on weak references, not time or size.
Wrap the HashMap with Collections.synchronizedMap.
Why it's wrong here
Does not address memory issue.
Use LinkedHashMap with removeEldestEntry method.
Why this is correct
LinkedHashMap can implement LRU cache easily.
Clue confirmation
The clue words "best", "never" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Use TreeMap with a custom comparator.
Why it's wrong here
TreeMap does not provide eviction.
Common exam traps
Oracle often tests the distinction between data structures that provide automatic eviction (LinkedHashMap) versus those that only manage references (WeakHashMap) or ordering (TreeMap), leading candidates to mistakenly choose WeakHashMap because they confuse weak references with cache eviction.
Detailed technical explanation
Under the hood, LinkedHashMap maintains a doubly linked list of entries in insertion order (or access order if configured). The `removeEldestEntry` method is a protected method that returns false by default; overriding it to return true when the map size exceeds a threshold allows automatic removal of the eldest entry. In real-world scenarios, this pattern is often used with access-order=true to implement an LRU (Least Recently Used) cache, where the eldest entry is the one least recently accessed, not just the oldest inserted.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the 1Z0-811 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Java Basics and Syntax — This question tests Java Basics and Syntax — Read the scenario before looking for a memorised answer..
The correct answer is: Use LinkedHashMap with removeEldestEntry method. — Option C is correct because LinkedHashMap provides a straightforward way to implement a cache eviction policy by overriding the `removeEldestEntry` method. This method is automatically called by `put` and `putAll` to decide whether to remove the eldest entry, allowing you to limit the cache size and prevent OutOfMemoryError without manual eviction logic.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "best", "never". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
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