StringBuffer , StringBuidler

StringBuidler sb="ram" StringBuffer sf = "ram"

Both throws comile ti开发者_开发问答me error . Please explain Why??????

There's no promotion from String to StringBuilder/Buffer. Try

StringBuilder = new StringBuilder("ram")

Because StringBuilder and StringBuffer isn't strings. You need to write

sb = new StringBuilder("ram")

Perhaps because it is "StringBuilder" not "StringBuidler"?
Or maybe because you need a semi-colon between the two lines?
Or that "ram" is a string and not a StringBuilder or StringBuffer?