@Override
	public void putAll(Map<? extends K, ? extends V> t) {
		Iterator<? extends K> it = t.keySet().iterator();
		while (it.hasNext()) {
			K key = it.next();
			V value = t.get(key);
			if (value != null) {
				put(key, value);
			}
		}
	}
@see java.util.Map#putAll(java.util.Map)
Ghidra/Framework/Generic/src/main/java/ghidra/util/datastruct/SoftCacheMap.java