正则表达式通配符.如何转化为普通字符的点

package com.popoaichuiniu.jacy;

public class Test {

public static void main(String[] args) {
String fileName="xxxx.jpg";
String fileNames []=fileName.split("\\.");
System.out.println(fileNames.length);
for(int i=0;i<fileNames.length;i++)
{
System.out.println(fileNames[i]+i);
}

}

}