Java tutorial
//package com.java2s; /* * This software is in the public domain under CC0 1.0 Universal plus a * Grant of Patent License. * * To the extent possible under law, the author(s) have dedicated all * copyright and related and neighboring rights to this software to the * public domain worldwide. This software is distributed without any * warranty. * * You should have received a copy of the CC0 Public Domain Dedication * along with this software (see the LICENSE.md file). If not, see * <http://creativecommons.org/publicdomain/zero/1.0/>. */ import java.util.*; public class Main { @SuppressWarnings("unchecked") public static void addToMapInMap(Object keyOuter, Object keyInner, Object value, Map theMap) { if (theMap == null) return; Map innerMap = (Map) theMap.get(keyOuter); if (innerMap == null) { innerMap = new LinkedHashMap(); theMap.put(keyOuter, innerMap); } innerMap.put(keyInner, value); } }