builder for HashMap

Question

Guava provides us with great factory methods for Java types, such as Maps.newHashMap().

But are there also builders for java Maps?

HashM         


        

Answer 1

This is something I always wanted, especially while setting up test fixtures. Finally, I decided to write a simple fluent builder of my own that could build any Map implementation - https://gist.github.com/samshu/b471f5a2925fa9d9b718795d8bbdfe42#file-mapbuilder-java

    /**
     * @param mapClass Any {@link Map} implementation type. e.g., HashMap.class
     */
    public static  MapBuilder builder(@SuppressWarnings("rawtypes") Class mapClass)
            throws InstantiationException,
            IllegalAccessException {
        return new MapBuilder(mapClass);
    }

    public MapBuilder put(K key, V value) {
        map.put(key, value);
        return this;
    }

    public Map build() {
        return map;
    }