问这个缓存线程安全吗？

EN

@RequiredArgsConstructor @Getter class CacheEntry {
    static CacheEntry get(String string, int start) {
        int hash = string.hashCode() ^ start; // or something better
        int index = hash & (cache.length-1);
        CacheEntry result = cache[index];
        if (result!=null && result.matches(string, start)) return result;
        result = new CacheEntry(string, start, computeSomething(string, start));
        cache[index] = result;
        return result;
    }

    private boolean matches(String string, int start) {
        if (string.equals(this.string)) return false;
        if (start == this.start) return false;
        return true;
    }

    private static ImmutableSomething computeSomething(String string, int start) {
        ...
    }

    private static final CacheEntry[] cache = new CacheEntry[256];

    private final String string;
    private final int start;

    private final ImmutableSomething something;
}