What methods can you use to improve system performance?

To improve system performance in Java, several approaches can be used:

• Profiling and identifying bottlenecks (CPU, memory, I/O).
• Optimizing algorithms and data structures.
• Using caching to reduce the number of expensive operations.
• Minimizing synchronization and locking.
• Using thread pools and asynchronous operations.
• Tuning the JVM (heap size, garbage collector).
• Optimizing database interactions (indexes, queries).

Example: using a cache for frequently requested data.

Map<String, Data> cache = new ConcurrentHashMap<>();

public Data getData(String key) {
    return cache.computeIfAbsent(key, k -> loadDataFromDB(k));
}