今天用到StringUtils.join方法,闲来无聊,看了下源码
当然不可能自己分析,你傻啊,在这里推荐一个别人分析的;
http://blog.csdn.net/baidu_31071595/article/details/51320622
首先导包
import org.apache.commons.lang3.StringUtils;
我在这里调用的是StringUtils.join方法
public static String join(Object[] array, char separator) 把数组中的元素连接成一个字符串返回，把分隔符separator也加上。 举例(*表示任意)： StringUtils.join(null, *) = null StringUtils.join({}, *) = "" StringUtils.join({null}, *) = "" StringUtils.join({"as","df","gh","jk"},‘ ‘)) = "as df gh jk" StringUtils.join({"as","df","gh","jk"},‘.‘)) = "as.df.gh.jk" StringUtils.join({"as","","df","gh"},‘.‘)) = "as..df.gh" StringUtils.join({"","as","","","df","",""},‘,‘))= ",as,,,df,," StringUtils.join({"","as","","","df","",""},‘ ‘))= " as df " StringUtils.join({"as.df.gh"},‘.‘)) = "as.df.gh" StringUtils.join({"as.df.gh"},‘ ‘)) = "as.df.gh"
over...
原文：http://www.cnblogs.com/chenzeyong/p/6511452.html