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According to the Java API \[[API 2006|AA. Java References#APIBibliography#API 06]\], class {{Character}} documentation (Unicode Character Representations) |
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This noncompliant code example attempts to trim leading letters from the {{string}}. It fails to accomplish this task because {{Character.isLetter()}} does not work for supplementary and combining characters \[[Hornig 2007|AA. Java References#HornigBibliography#Hornig 07]\] (sic). |
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// Fails for supplementary or combining characters
public static String trim_bad1(String string) {
char ch;
for (int i = 0; i < string.length(); i += 1) {
ch = string.charAt(i);
if (!Character.isLetter(ch)) {
break;
}
}
return string.substring(i);
}
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This noncompliant code example ameliorates the problem by using the {{String.codePointAt()}} method, which accepts an {{int}} argument. This works for supplementary characters but not for combining characters \[[Hornig 2007|AA. JavaBibliography#Hornig References#Hornig 07]\] (sic). |
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// Fails for combining characters
public static String trim_bad2(String string) {
int ch;
for (int i = 0; i < string.length(); i += Character.charCount(ch)) {
int ch = string.codePointAt(i);
if (!Character.isLetter(ch)) {
break;
}
}
return string.substring(i);
}
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This compliant solution works for both supplementary and combining characters \[[Hornig 2007|AA. Java References#HornigBibliography#Hornig 07]\] (sic). According to the Java API \[[API 2006|AA. JavaBibliography#API References#API 06]\], class {{java.text.BreakIterator}} documentation |
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\[[API 2006|AA. Java References#APIBibliography#API 06]\] Classes {{Character}} and {{BreakIterator}} \[[Hornig 2007|AA. Java References#HornigBibliography#Hornig 07]\] Problem areas: Characters |
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