05 August 2008
字符串中只reverse字符
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public String reverseOnlyLetters(String S) {
StringBuilder sb = new StringBuilder(S);
for (int i = 0, j = S.length() - 1; i < j;) {
if (!Character.isLetter(sb.charAt(i))) {
++i;
} else if (!Character.isLetter(sb.charAt(j))) {
--j;
} else {
sb.setCharAt(i, S.charAt(j));
sb.setCharAt(j--, S.charAt(i++));
}
}
return sb.toString();
}