Verify if string is valid ASCII

I have a string and I want to verify if it contains only valid ASCII, for example, if the string contains characters like the right allow, then it be should reject ! can anyone help? thanks!

What's the in the db? A series of bytes from a different character set? (One which, when displayed on a terminal (which may or may not understand the character set), displays a right arrow?)
Perhaps the ultimately correct solution is to use java.io.InputStreamReader, constructing it denoting the correct character set.
Or, to put data into the database using OutputStreamWriter, again specifying the correct character set.
Then you catch CharConversionExceptions. That's how you detect bad input.
Or, do the same kind of thing using String.getBytes and String constructors.

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