利用java 无法分割小圆点如何解决

public class TestDemo { 
 private static class SplitDemo { 
 public static String[] split(String rawer, String spliter) {
  //先拷贝一份，避免直接更改全局变量
  String rawerTemp = rawer;
  //容纳分割后的分隔符前的字符串
  List<String> list = new ArrayList<String>();
  
  while(rawerTemp.indexOf(spliter)!=-1) {
  //还存在spliter分割符的时候
  String temp = rawerTemp.substring(0, rawerTemp.indexOf(spliter));
  //将分隔符前的部分添加到list
  list.add(temp);
  //分割得到第一个分隔符后边的所有字符串
  rawerTemp = rawerTemp.substring(rawerTemp.indexOf(spliter)+spliter.length());
  }
  
  //如果不存在分割符则直接加入
  if(rawerTemp.length()!=0) {
  list.add(rawerTemp);
  }
  //生成数组并返回
  if(list.size()>0) {
  String[] arrays = new String[list.size()];
  for(int i=0;i<list.size();i++) {
   arrays[i] = list.get(i);
  }
  return arrays;
  }
  return new String[0];
 } 
 }
 
 @Test
 public void test() {
 System.out.println(Arrays.toString(SplitDemo.split("", "\\")));
 System.out.println(Arrays.toString(SplitDemo.split("aa&&22", "&&")));
 System.out.println(Arrays.toString(SplitDemo.split("aa&&22&&", "&&")));
 System.out.println(Arrays.toString(SplitDemo.split("aa&&||&&", "||")));
 }
}