Dynamic methods in java

dynamic.java

class Logger {
  private BiConsumer<Object, Integer> logger = null;
  
  // ...
  
  private Logger(Object logger) {
      this.akkaLogger = (LoggingAdapter) logger;
      this.logger = (message, level) -> {
          switch (level) {
              case INFO:  akkaInfo(message);
                          break;
              case DEBUG: akkaDebug(message);
                          break;
              case ERROR: akkaError(message);
                          break;
              case WARN:  akkaWarn(message);
                          break;
          }
      };
  }
  
  private Logger() {
      this.logger = (message, level) -> System.out.println(message);
  }
  
  // ...
}