import java.util.*; | |
class Test { | |
HashMap<String, List<String>> f; | |
void foo(String s, String s1) { | |
List<String> set = f.get(s); | |
if (set == null) { | |
set = new HashSet<String>(); | |
f.put(s, set); | |
} | |
set.add(s1); | |
} | |
} | |
class HashMap<K, V> extends java.util.HashMap<K, V>{} |