Here's another minor performance tweak to
public String(int[] codePoints, int offset, int count) {
that optimizes for BMP.
// Pass 1: Compute precise size of char[]
int n = count;
for (int i = offset; i < end; i++) {
int c = codePoints[i];
if (Character.isBMPCodePoint(c))
;
else if (Character.isSupplementaryCodePoint(c))
n++;
else throw new IllegalArgumentException(Integer.toString(c));
}
http://cr.openjdk.java.net/~martin/webrevs/openjdk7/public-isBMPCodePoint/
Martin
