apollo-demo/src/main/java/com/ctrip/framework/apollo/demo/spring/springBootDemo/config/SampleRedisConfig.java/SampleRedisConfig/toString
class SampleRedisConfig:  @Override
  public String toString() {
    return String.format(
        "[SampleRedisConfig] expireSeconds: %d, clusterNodes: %s, commandTimeout: %d, someMap: %s, someList: %s",
            expireSeconds, clusterNodes, commandTimeout, someMap, someList);
  }