Java tutorial
//package com.java2s; import java.util.HashMap; import java.util.Map; public class Main { private static final Map<String, String> mimeTypeToExtensionMap = new HashMap<String, String>(); /** * Returns true if the given MIME type has an entry in the map. * * @param mimeType * A MIME type (i.e. text/plain) * @return True if there is a mimeType entry in the map. */ public static boolean hasMimeType(String mimeType) { if (mimeType == null || mimeType.isEmpty()) { return false; } return mimeTypeToExtensionMap.containsKey(mimeType); } }