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Copy pathstring-chars-stream.json
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54 lines (54 loc) · 1.79 KB
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{
"id": 35,
"slug": "string-chars-stream",
"title": "String chars as stream",
"category": "strings",
"difficulty": "beginner",
"jdkVersion": "9",
"oldLabel": "Java 8",
"modernLabel": "Java 9+",
"oldApproach": "Manual Loop",
"modernApproach": "chars() Stream",
"oldCode": "for (int i = 0; i < str.length(); i++) {\n char c = str.charAt(i);\n if (Character.isDigit(c)) {\n process(c);\n }\n}",
"modernCode": "str.chars()\n .filter(Character::isDigit)\n .forEach(c -> process((char) c));",
"summary": "Process string characters as a stream pipeline.",
"explanation": "String.chars() returns an IntStream of character values, enabling functional processing. For Unicode support, codePoints() handles supplementary characters correctly.",
"whyModernWins": [
{
"icon": "🔗",
"title": "Chainable",
"desc": "Use filter, map, collect on character streams."
},
{
"icon": "📐",
"title": "Declarative",
"desc": "Describe what to do, not how to loop."
},
{
"icon": "🌐",
"title": "Unicode-ready",
"desc": "codePoints() correctly handles emoji and supplementary chars."
}
],
"support": {
"state": "available",
"description": "Available since JDK 8+ (improved in 9+)"
},
"prev": "strings/string-formatted",
"next": "strings/string-lines",
"related": [
"strings/string-repeat",
"strings/string-isblank",
"strings/string-formatted"
],
"docs": [
{
"title": "String.chars()",
"href": "https://docs.oracle.com/en/java/javase/25/docs/api/java.base/java/lang/String.html#chars()"
},
{
"title": "CharSequence.codePoints()",
"href": "https://docs.oracle.com/en/java/javase/25/docs/api/java.base/java/lang/CharSequence.html#codePoints()"
}
]
}