---

id: 31

slug: "string-repeat"

title: "String.repeat()"

category: "strings"

difficulty: "beginner"

jdkVersion: "11"

oldLabel: "Java 8"

modernLabel: "Java 11+"

oldApproach: "StringBuilder Loop"

modernApproach: "repeat()"

oldCode: |-

StringBuilder sb = new StringBuilder();

for (int i = 0; i < 3; i++) {

sb.append("abc");

}

String result = sb.toString();

modernCode: |-

String result = "abc".repeat(3);

// "abcabcabc"

summary: "Repeat a string n times without a loop."

explanation: "String.repeat(int) returns the string concatenated with itself n times.\

\ Handles edge cases: repeat(0) returns empty string, repeat(1) returns the same\

\ string."

whyModernWins:

- icon: "📏"

title: "One-liner"

desc: "Replace 5 lines of StringBuilder code with one call."

- icon: "⚡"

title: "Optimized"

desc: "Internal implementation is optimized for large repeats."

- icon: "📖"

title: "Clear intent"

desc: "repeat(3) immediately conveys the purpose."

support:

state: "available"

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

prev: "strings/string-strip"

next: "strings/string-indent-transform"

related:

- "strings/string-isblank"

- "strings/string-formatted"

- "strings/string-chars-stream"

docs:

- title: "String.repeat()"

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