{

"id": 29,

"slug": "string-isblank",

"title": "String.isBlank()",

"category": "strings",

"difficulty": "beginner",

"jdkVersion": "11",

"oldLabel": "Java 8",

"modernLabel": "Java 11+",

"oldApproach": "trim().isEmpty()",

"modernApproach": "isBlank()",

"oldCode": "boolean blank =\n str.trim().isEmpty();\n// or: str.trim().length() == 0",

"modernCode": "boolean blank = str.isBlank();\n// handles Unicode whitespace too",

"summary": "Check for blank strings with a single method call.",

"explanation": "isBlank() returns true if the string is empty or contains only whitespace, including Unicode whitespace characters that trim() misses.",

"whyModernWins": [

{

"icon": "📖",

"title": "Self-documenting",

"desc": "isBlank() says exactly what it checks."

},

{

"icon": "🌐",

"title": "Unicode-aware",

"desc": "Handles all Unicode whitespace, not just ASCII."

},

{

"icon": "⚡",

"title": "No allocation",

"desc": "No intermediate trimmed string is created."

}

],

"support": {

"state": "available",

"description": "Widely available since JDK 11 (Sept 2018)"

},

"prev": "collections/unmodifiable-collectors",

"next": "strings/string-strip",

"related": [

"strings/string-formatted",

"strings/string-strip",

"strings/string-indent-transform"

]

}