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Library providing immutable/persistent collection classes for Java. While collections are immutable they provide methods for adding and removing values by creating new modified copies of themselves. Each copy shares almost all of its structure with other copies to minimize memory consumption.

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package org.javimmutable.collections;

import javax.annotation.Nonnull;

/**
 * Interface for simple collections that contain a head value and a tail containing the remainder of the sequence.
 */
public interface Sequence
{
    /**
     * Determines if this is the end of the Sequence.  When true the Sequence is empty and
     * getHead() cannot be called.  getTail() can still be called but will always return
     * an empty Sequence once isEmpty() returns true.
     */
    boolean isEmpty();

    /**
     * Accesses the first value in the Sequence.
     */
    T getHead();

    /**
     * Accesses the rest of the Sequence.
     */
    @Nonnull
    Sequence getTail();
}