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Goldman Sachs · Java
Practice Java questions specifically asked in Goldman Sachs interviews – ideal for online test preparation, technical rounds and final HR discussions.
Questions
8
Tagged for this company + subject
Company
Goldman Sachs
View company-wise questions
Subject
Java
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Go through each question and its explanation. Use this page for targeted revision just before your Goldman Sachs Java round.
Default Java object serialization activates when a class implements Serializable. You can customize via writeObject/readObject, but the marker interface is the trigger.
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ReentrantLock provides advanced features: timed/interruptible acquisition, optional fairness, and separate Lock/Condition objects. Performance depends on the workload; it’s not universally faster.
Exception translation means catching a low-level exception and throwing a higher-level, more meaningful one. It’s appropriate when moving across layers—for example, converting SQLException into a domain-specific DataAccessException. Preserve the cause using the constructor so the original stack trace remains available.
ReentrantLock supports tryLock (with or without timeout) and lockInterruptibly, plus optional fairness policy at construction. It does not inherently prevent deadlocks.
volatile guarantees visibility and ordering for a single variable: writes by one thread become visible to others, and reads/writes are not reordered across that variable. It does NOT make compound actions atomic (like ++), nor does it protect invariants across multiple variables. Use locks or atomics for atomicity and compound state changes.
Catch blocks are matched top-down. If a broader type comes first, narrower types are unreachable, causing a compile-time error.
`distinct` tracks seen elements to remove duplicates, requiring state. `sorted` is also stateful. `filter`, `map`, and `peek` are stateless.
TreeMap uses natural ordering or a comparator; null keys cannot be compared and thus are not supported. Null values are allowed.