public synchronized V put(K key, V value) {
// Make sure the value is not null
if (value == null) {
    throw new NullPointerException();
}
 // Makes sure the key is not already in the hashtable.
Entry<?,?> tab[] = table;
int hash = key.hashCode();
int index = (hash & 0x7FFFFFFF) % tab.length;
@SuppressWarnings("unchecked")
Entry<K,V> entry = (Entry<K,V>)tab[index];
for(; entry != null ; entry = entry.next) {
    if ((entry.hash == hash) && entry.key.equals(key)) {
        V old = entry.value;
        entry.value = value;
        return old;
    }
}
 addEntry(hash, key, value, index);
return null;
}
public synchronized V get(Object key) {
Entry<?,?> tab[] = table;
int hash = key.hashCode();
int index = (hash & 0x7FFFFFFF) % tab.length;
for (Entry<?,?> e = tab[index] ; e != null ; e = e.next) {
    if ((e.hash == hash) && e.key.equals(key)) {
        return (V)e.value;
    }
}
return null;
}