Returns an optional charset for the value of the charset parameter if it is specified.
@throws IllegalStateException if multiple charset values have been set for this media type
@throws IllegalCharsetNameException if a charset value is present, but illegal
@throws UnsupportedCharsetException if a charset value is present, but no support is availablein this instance of the Java virtual machine
Returns an optional charset for the value of the charset parameter if it is specified.
@throws IllegalStateException if multiple charset values have been set for this media type
@throws IllegalCharsetNameException if a charset value is present, but illegal
@throws UnsupportedCharsetException if a charset value is present, but no support is availablein this instance of the Java virtual machine
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