保持顺序的 Java Properties 类 | 隔叶黄莺 Unmi Blog

 private static final long serialVersionUID = -4627607243846121965L;

     

    private final LinkedHashSet<Object> keys = new LinkedHashSet<Object>();

    public Enumeration<Object> keys() {

        return Collections.<Object> enumeration(keys);

    }

    public Object put(Object key, Object value) {

        keys.add(key);

        return super.put(key, value);

    }

    public Set<Object> keySet() {

        return keys;

    }

    public Set<String> stringPropertyNames() {

        Set<String> set = new LinkedHashSet<String>();

        for (Object key : this.keys) {

            set.add((String) key);

        }

        return set;

    }