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在使用Log4j打印日志时出现如下报错：log4j:WARN No appenders could be found for logger (com.zhangzw.search.BinarySearch).log4j:WARN Please initialize the log4j system properly.log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.查看官网说明：

Array -> ListString[] arr = new String[]{"a", "b", "c", "d", "e"};List<String> list = Arrays.asList(arr); // [a, b, c, d, e]List -> ArrayList<String> list = Lists.newArrayList("a", "b", "c", "d", "e");String[] arr = list.toArray(new