Strings beginner

String.repeat()

Repeat a string n times without a loop.

Code Comparison

✕ Java 8

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

✓ Java 11+

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

Modern Approach

repeat()

Since JDK

Difficulty

beginner

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.

String.repeat()

One-liner

Optimized

Clear intent

String.isBlank()

String.formatted()

String chars as stream