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JSci is a set of open source Java packages. The aim is to encapsulate scientific methods/principles in the most natural way possible. As such they should greatly aid the development of scientific based software. It offers: abstract math interfaces, linear algebra (support for various matrix and vector types), statistics (including probability distributions), wavelets, newtonian mechanics, chart/graph components (AWT and Swing), MathML DOM implementation, ... Note: some packages, like javax.comm, for the astro and instruments package aren't listed as dependencies (not available).

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package JSci.physics.particles;

import JSci.physics.quantum.QuantumParticle;

/**
* A class representing etas.
* @version 1.5
* @author Mark Hale
*/
public final class Eta extends Meson {
        /**
        * Constructs an eta.
        */
        public Eta() {}
        /**
        * Returns the rest mass (MeV).
        * @return 547.45
        */
        public double restMass() {return 547.45;}
        /**
        * Returns the electric charge.
        * @return 0
        */
        public int charge() {return 0;}
        /**
        * Returns the number of 1/2 units of isospin.
        * @return 0
        */
        public int isospin() {return 0;}
        /**
        * Returns the number of 1/2 units of the z-component of isospin.
        * @return 0
        */
        public int isospinZ() {return 0;}
        /**
        * Returns the strangeness number.
        * @return 0
        */
        public int strangeQN() {return 0;}
        /**
        * Returns the quark composition.
        */
        public QuantumParticle[] quarks() {
                QuantumParticle comp[]={new Down(),new AntiDown(),new Up(),new AntiUp()};
                return comp;
        }
        /**
        * Returns the antiparticle of this particle.
        */
        public QuantumParticle anti() {
                return new Eta();
        }
        /**
        * Returns true if qp is the antiparticle.
        */
        public boolean isAnti(QuantumParticle qp) {
                return (qp!=null) && (qp instanceof Eta);
        }
        /**
        * Returns a string representing this class.
        */
        public String toString() {
                return new String("Eta");
        }
}