# assert m.has_key("four")
# assert m["four"] == ['i', 'i', 'i', 'i']
# assert m["zzz"] == new Array[Char]
-class MultiHashMap[K: Object, V]
+class MultiHashMap[K, V]
super HashMap[K, Array[V]]
# Add `v` to the array associated with `k`.
# assert hm2[1, "one"] == 1.0
# assert hm2[2, "not-two"] == null
# ~~~~
-class HashMap2[K1: Object, K2: Object, V]
+class HashMap2[K1, K2, V]
private var level1 = new HashMap[K1, HashMap[K2, V]]
# Return the value associated to the keys `k1` and `k2`.
# assert hm3[1, "one", 11] == 1.0
# assert hm3[2, "not-two", 22] == null
# ~~~~
-class HashMap3[K1: Object, K2: Object, K3: Object, V]
+class HashMap3[K1, K2, K3, V]
private var level1 = new HashMap[K1, HashMap2[K2, K3, V]]
# Return the value associated to the keys `k1`, `k2`, and `k3`.
# assert dma["b"] == [65, 66]
# assert dma.default == [65]
# ~~~~
-class DefaultMap[K: Object, V]
+class DefaultMap[K, V]
super HashMap[K, V]
# The default value.