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make Long.parseLong more efficient

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This commit is contained in:
Joel Dice
2008-08-29 11:37:53 -06:00
parent 9017b5996a
commit e0e827596e
2 changed files with 9 additions and 1 deletions
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6
classpath/java/lang/Long.java
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@ -128,15 +128,19 @@ public final class Long extends Number implements Comparable<Long> {
int i = 0;
long number = 0;
boolean negative = s.startsWith("-");
int length = s.length();
if (negative) {
i = 1;
-- length;
}
long factor = pow(radix, length - 1);
for (; i < s.length(); ++i) {
char c = s.charAt(i);
int digit = Character.digit(c, radix);
if (digit >= 0) {
number += digit * pow(radix, (s.length() - i - 1));
number += digit * factor;
factor /= radix;
} else {
throw new NumberFormatException("invalid character " + c + " code " +
(int) c);