public UnknownFormatConversionException(String s) {if (s == null) {throw new NullPointerException();}this.s = s;}

public UnknownFormatConversionException ( String s ) { if ( s == null ) { throw new NullPointerException ( ) ; } this . s = s ; }
public UnknownFormatConversionException(string s){if (s == null){throw new System.ArgumentNullException();}this.s = s;}
