Here you can find the source of d d(String fmt, Object... args)
public static void d(String fmt, Object... args)
//package com.java2s; import org.slf4j.Logger; public class Main { private static Logger logger; public static void d(String fmt, Object... args) { i(logger, fmt, args);/*from w ww . j a v a2s. c om*/ } public static void d(Logger log, String fmt, Object... args) { if (log != null && log.isDebugEnabled()) { log.debug(fmt, args); } } public static void i(String fmt, Object... args) { i(logger, fmt, args); } public static void i(Logger log, String fmt, Object... args) { if (log != null && log.isInfoEnabled()) { log.info(fmt, args); } } }