Is using a string as a key in a hash table considered sufficiently quality?

Using a string as a key in a hash table in Java is considered a quite good and common solution. The String class in Java overrides the hashCode() and equals() methods, which ensures correct and efficient calculation of the hash code and comparison of keys.

However, it is important to consider:

• Performance: the hash code of a string is computed once and cached, which speeds up repeated operations.
• Collisions: with a large number of keys with similar values, collisions are possible, but for strings, this is usually not critical.
• Immutability: strings in Java are immutable, which guarantees the stability of the hash code.

Example of usage:

Map<String, Integer> map = new HashMap<>();
map.put("key1", 100);
int value = map.get("key1");

Thus, strings are a good choice for keys in hash tables if there are no specific requirements for performance or memory.