Discover Java 21’s New repeat() Method for StringBuilder and StringBuffer

Java 21 adds a repeat method to StringBuilder and StringBuffer.

@Override
public StringBuilder repeat(int codePoint, int count) {
    super.repeat(codePoint, count);
    return this;
}

@Override
public StringBuilder repeat(CharSequence cs, int count) {
    super.repeat(cs, count);
    return this;
}

Try the method with a simple example:

var sb = new StringBuilder().repeat("*", 10);
System.out.println(sb);

The program prints:

**********

The overload whose first parameter is codePoint repeats a Unicode code point, so it works with Unicode characters.

This API can be handy for quickly building text separators or other repeated patterns; feel free to experiment with other uses.