src/java.logging/share/classes/java/util/logging/Formatter.java:140: warning: [ShortCircuitBoolean] Prefer the short-circuiting boolean operators && and || to & and |.
                if (digit >= '0' & digit <= '9') {
                                 ^
    (see https://errorprone.info/bugpattern/ShortCircuitBoolean.md)
  Did you mean 'if (digit >= '0' && digit <= '9') {'?