replaceAll有$的问题,帮忙看一下,谢谢..
public   static   void   main(String[]   args)   {
String   k= "adasd ";
k=k.replaceAll( "d ", "a$ ");

System.out.println(k);
}
执行后为什么报错呢?

java.lang.StringIndexOutOfBoundsException:   String   index   out   of   range:   2
at   java.lang.String.charAt(String.java:444)
at   java.util.regex.Matcher.appendReplacement(Matcher.java:559)
at   java.util.regex.Matcher.replaceAll(Matcher.java:661)
at   java.lang.String.replaceAll(String.java:1663)
at   Test.main(Test.java:15)
Exception   in   thread   "main "

------解决方案--------------------
基于正则匹配的 $属于关键字符
所以会有异常