code: public static void log(Object obj) {
  		if (obj instanceof Throwable) {
  			Throwable e = (Throwable) obj;
  			log(e, e.getMessage());
  		} else {
  			log("{}", obj);
  		}
  	}
docs: 同 System.out.println()方法，打印控制台日志<br>
  如果传入打印对象为{@link Throwable}对象，那么同时打印堆栈
  
  @param obj 要打印的对象