/super-csv/src/main/java/org/supercsv/util/TwoDHashMap.java
HashMap<K2, V> innerMap = map.get ( firstKey ) ;
if( innerMap == null ) { return null; } return innerMap.get(secondKey); } public Object set(final K1 firstKey, final K2 secondKey, final V value) { <extra_id_0> if( innerMap == null ) { innerMap = new HashMap<K2, V>(); map.put(firstKey, innerMap); } return innerMap.put(secondKey, value); }