import java.util.*;

/**
 * Atom is a simple JavaBean that references instances of Quark.
 */
public class Atom {
    private Vector quarks = new Vector();

    /**
     * Construct new Atom.
     */
    public Atom() {
    }

    /**
     * Get list of quarks.
     */
    public Vector getQuarks() {
        return quarks;
    }

    /**
     * Set list of quarks.
     */
    public void setQuarks(Vector quarks) {
        this.quarks = quarks;
    }

    /**
     * Return String representation.
     */
    public String toString() {
        StringBuffer buf = new StringBuffer();
        Vector vector = getQuarks();

        for(int i = 0; i < vector.size(); i++)
        {
            buf.append(vector.get(i));
            buf.append('\n');
        }

        return buf.toString();
    }
}