🚀 go-pugleaf

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 public synchronized Object put(Object key, Object 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;
    for (Entry e = tab[index] ; e != null ; e = e.next) {
        if ((e.hash == hash) && e.key.equals(key)) {
        Object old = e.value;
        e.value = value;
        return old;
        }
    }

    modCount++;
    if (count >= threshold) {
        // Rehash the table if the threshold is exceeded
        rehash();

            tab = table;
            index = (hash & 0x7FFFFFFF) % tab.length;
    } 

    // Creates the new entry.
    Entry e = new Entry(hash, key, value, tab[index]);
    tab[index] = e;
    count++;
    return null;
    }
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