import com.google.common.collect.ArrayListMultimap; import com.google.common.collect.Multimap; public class MultimapExample { public static void main(String[] args) { Multimap<String, String> multimap = ArrayListMultimap.create(); multimap.put("key1", "value1"); multimap.put("key1", "value2"); multimap.put("key2", "value3"); multimap.remove("key1", "value1"); for (String key : multimap.keySet()) { for (String value : multimap.get(key)) { System.out.println(key + ": " + value); } } } }