The %n inserts a newline: the %n and %% format specifiers : Formatter Flags « Development « Java Tutorial

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2. Development
3. Formatter Flags

import java.util.Formatter;

public class MainClass {
  public static void main(String args[]) {
    Formatter fmt = new Formatter();

    fmt.format("Copying file%nTransfer is %d%% complete", 88);
    System.out.println(fmt);
  }
}

Copying file
Transfer is 88% complete