Prompt
Before implementing or modifying algorithms, carefully evaluate data structure properties and operation costs. Always:
- Understand data structure guarantees: Choose structures that provide the necessary ordering and performance characteristics. For instance, when replacing one structure with another, be aware of their different behaviors:
// Problematic: PriorityBlockingQueue doesn't guarantee ordering for equal priorities
private final PriorityBlockingQueue<ShutdownTask> shutdownTasks = new PriorityBlockingQueue<>();
// Better: If order matters for equal priorities, use a secondary comparison key
private final PriorityBlockingQueue<ShutdownTask> shutdownTasks =
new PriorityBlockingQueue<>(11, Comparator
.comparing(ShutdownTask::getPriority)
.thenComparing(ShutdownTask::getCreationOrder));
- Avoid unnecessary computations: Eliminate redundant operations by:
- Deriving one data structure from another when they contain inverse or related data
- Leveraging existing ordering instead of re-sorting collections
- Using the most efficient implementation for your specific case (e.g., specific
List.of()implementations)
- Choose appropriate algorithms: Select the right algorithm for specific operations like version comparison, ensuring it handles edge cases correctly:
// Better performance and correctness for version comparisons
new ComparableVersion("2.10.0.CR1").compareTo(new ComparableVersion(version))
These optimizations improve both performance and correctness of your code while keeping it maintainable.