英汉词典程序

public class Dictionary {
    static private Map<String, String > d= new HashMap();
    static private int size;

    public static int getSize(){
    	return size;
    	}

    public static void insertPare(String Eng, String Ch){
        d.put(Eng, Ch);
        size ++;
    }

    public static void flushToFile() throws IOException{

        File f = new File("d.dat");
        FileOutputStream fo = new FileOutputStream(f);
        ObjectOutputStream oo = new ObjectOutputStream(fo);

        oo.writeObject(d);

        oo.flush();
        oo.close();
        fo.close();
    }

    public static Map<String, String> getFromFile(String fn)
                            throws IOException, ClassNotFoundException{

        FileInputStream fi = new FileInputStream(fn);
        ObjectInputStream oi = new ObjectInputStream(fi);

        Map<String, String> di = (Map<String, String>) oi.readObject();

        fi.close();
        oi.close();

        return di;
    }

    public static String query(String Eng)
            throws IOException, ClassNotFoundException{

        Map<String, String> map = getFromFile("d.dat");
        return map.get(Eng);
    }

    public static void main(String[] args){
        insertPare("amnesty", "赦免");
        insertPare("torture","虐待");
        insertPare("scandal","丑闻");
        try {
            flushToFile();

            System.out.print("请输入要查询的词: ");
            Scanner sc = new Scanner(System.in);
            String r = sc.nextLine();

            System.out.println(query(r));
        }catch (Exception e){}

    }
}