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handle negative numbers in Long.parseLong() and improve error detection

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This commit is contained in:
Joel Dice 2007-08-23 20:35:27 -06:00
parent dd17a27485
commit 493667a6cc
1 changed files with 17 additions and 6 deletions
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23
classpath/java/lang/Long.java
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@ -98,19 +98,30 @@ public final class Long extends Number {
return parseLong(s, 10);
}
public static long parseLong(String s, int radix) {
public static long parseLong(String s, int radix) {
int i = 0;
long number = 0;
boolean negative = s.startsWith("-");
if (negative) {
i = 1;
}
for (int i = 0; i < s.length(); ++i) {
for (; i < s.length(); ++i) {
char c = s.charAt(i);
if (((c >= '0') && (c <= '9')) ||
((c >= 'a') && (c <= 'z'))) {
long digit = ((c >= '0' && c <= '9') ? (c - '0') : (c - 'a' + 10));
number += digit * pow(radix, (s.length() - i - 1));
} else {
throw new NumberFormatException("invalid character " + c + " code " +
(int) c);
if (digit < radix) {
number += digit * pow(radix, (s.length() - i - 1));
continue;
}
}
throw new NumberFormatException("invalid character " + c + " code " +
(int) c);
}
if (negative) {
number = -number;
}
return number;