Here are a few title options, capturing the essence of your article and posing a question: * **Iterating Through Unicode Codepoints in Java: How Can We Do It Efficiently?** * **Java Strings and Codep

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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