---

id: 30

slug: "string-strip"

title: "String.strip() vs trim()"

category: "strings"

difficulty: "beginner"

jdkVersion: "11"

oldLabel: "Java 8"

modernLabel: "Java 11+"

oldApproach: "trim()"

modernApproach: "strip()"

oldCode: |-

// trim() only removes ASCII whitespace

// (chars <= U+0020)

String clean = str.trim();

modernCode: |-

// strip() removes all Unicode whitespace

String clean = str.strip();

String left = str.stripLeading();

String right = str.stripTrailing();

summary: "Use Unicode-aware stripping with strip(), stripLeading(), stripTrailing()."

explanation: "trim() only removes characters ≤ U+0020 (ASCII control chars and space).\

\ strip() uses Character.isWhitespace() which handles Unicode spaces like non-breaking\

\ space, ideographic space, etc."

whyModernWins:

- icon: "🌐"

title: "Unicode-correct"

desc: "Handles all whitespace characters from every script."

- icon: "🎯"

title: "Directional"

desc: "stripLeading() and stripTrailing() for one-sided trimming."

- icon: "🛡️"

title: "Fewer bugs"

desc: "No surprise whitespace left behind in international text."

support:

state: "available"

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

prev: "strings/string-isblank"

next: "strings/string-repeat"

related:

- "strings/string-formatted"

- "strings/string-indent-transform"

- "strings/string-chars-stream"

docs:

- title: "String.strip()"

href: "https://docs.oracle.com/en/java/javase/25/docs/api/java.base/java/lang/String.html#strip()"