https://openjdk.java.net/ 
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package java.net;


A simple interface which provides a mechanism to map
between a file name and a MIME type string.

Author: Steven B. Byrne
Since:  1.1
/**
 * A simple interface which provides a mechanism to map
 * between a file name and a MIME type string.
 *
 * @author  Steven B. Byrne
 * @since   1.1
 */
public interface FileNameMap {

    
Gets the MIME type for the specified file name.

Params:
  • fileName – the specified file name
Returns:a String indicating the MIME type for the specified file name.
/**
     * Gets the MIME type for the specified file name.
     * @param fileName the specified file name
     * @return a {@code String} indicating the MIME
     * type for the specified file name.
     */
    public String getContentTypeFor(String fileName);
}