String.repeat()

Code Comparison

StringBuilder sb = new StringBuilder();
for (int i = 0; i < 3; i++) {
    sb.append("abc");
}
String result = sb.toString();

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

Why the modern way wins

📏

One-liner

Replace 5 lines of StringBuilder code with one call.

⚡

Optimized

Internal implementation is optimized for large repeats.

📖

Clear intent

repeat(3) immediately conveys the purpose.

Old Approach

StringBuilder Loop

JDK Support

String.repeat()

Available

Widely available since JDK 11 (Sept 2018)

How it works

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.