Iterating Through Unicode Codepoints in Java Strings
You may have encountered situations where you need to traverse the codepoints of a Java String, but the standard method String#codePointAt(int) isn't optimal. While it returns the codepoint at a specific character offset, it doesn't align with the codepoint offset.
To address this issue, a common approach is to utilize String#charAt(int) to extract the character at a given index and check if it falls within the high-surrogates range. However, concerns arise regarding the storage of codepoints in the high-surrogates range (whether as two characters or one) and the performance implications of such an approach.
Fortunately, Java provides a more efficient solution for iterating through codepoints using String#codePointAt(int). Here's a comprehensive approach:
<code class="java">final int length = s.length(); for (int offset = 0; offset < length; ) { final int codepoint = s.codePointAt(offset); // Perform desired operations on the codepoint offset += Character.charCount(codepoint); }</code>
This method accurately handles codepoints outside the BMP, ensuring reliable iteration over all Unicode characters.
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