Java – what is a cached string?
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Java
What is a cached string? Or what is string caching? I've read this term many times at JNI, but I don't know what it is
Solution
Cache improves performance (which is important for JNI) and reduces memory usage
This is a simple example of string caching. If you are interested in how a simple caching algorithm works - but this is only an example, I don't recommend that you actually use it in your code:
public class StingCache { static final String[] STRING_CACHE = new String[1024]; static String getCachedString(String s) { int index = s.hashCode() & (STRING_CACHE.length - 1); String cached = STRING_CACHE[index]; if (s.equals(cached)) { return cached; } else { STRING_CACHE[index] = s; return s; } } public static void main(String... args) { String a = "x" + new Integer(1); System.out.println("a is: String@" + System.identityHashCode(a)); String b = "x" + new Integer(1); System.out.println("b is: String@" + System.identityHashCode(b)); String c = getCachedString(a); System.out.println("c is: String@" + System.identityHashCode(c)); String d = getCachedString(b); System.out.println("d is: String@" + System.identityHashCode(d)); } }
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