public static File createTempDirectory(String prefix, String suffix) throws IOException {
		return createTempDirectory(prefix, suffix, null);
	}
public static File createTempDirectory ( String prefix , String suffix ) throws IOException { return createTempDirectory ( prefix , suffix , null ) ; }
Create an empty directory in the default temporary-file directory, using
the given prefix and suffix to generate its name.  Invoking this method
is equivalent to invoking <code>{@link #createTempDirectory(java.lang.String,
java.lang.String, java.io.File)
createTempDirectory(prefix,&nbsp;suffix,&nbsp;null)}</code>.

@param  prefix is the prefix string to be used in generating the file's
name; must be at least three characters long

@param  suffix is the suffix string to be used in generating the file's
name; may be <code>null</code>, in which case the
suffix <code>".tmp"</code> will be used
@return  An abstract pathname denoting a newly-created empty file
@throws  IllegalArgumentException
If the <code>prefix</code> argument contains fewer than three
characters
@throws  IOException  If a file could not be created
@throws  SecurityException
If a security manager exists and its <code>{@link
java.lang.SecurityManager#checkWrite(java.lang.String)}</code>
method does not allow a file to be created
@since 6.2