6sabcsssfsfs33 去掉ab3

public static void main(String[] args)
{
String str="6sabcsssfsfs33";
StringBuffer sbf = new StringBuffer();
char[] chars = str.toCharArray();

boolean[] removeChars =new boolean[256];
for(int i=0;i<256;i++)
{
removeChars[i]=true;
}
removeChars['a'] = false;
removeChars['b'] = false;
removeChars['3'] = false;

for(int i=0;i<chars.length;i++ )
{
if(removeChars[chars[i]])
{
sbf.append(chars[i]);
}
}
System.out.println(sbf.toString());
}