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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.maths.fields;

import JSci.maths.*;
import JSci.maths.groups.AbelianGroup;

/**
* The IntegerRing class encapsulates the ring of integer numbers.
* @version 1.0
* @author Mark Hale
*/
public final class IntegerRing extends Object implements Ring {
        public final static MathInteger ZERO=new MathInteger(0);
        public final static MathInteger ONE=new MathInteger(1);

        private final static IntegerRing _instance = new IntegerRing();
        /**
        * Constructs a ring of integer numbers.
        */
        private IntegerRing() {}
        /**
        * Constructs a ring of integer numbers.
        * Singleton.
        */
        public static final IntegerRing getInstance() {
                return _instance;
        }
        /**
        * Returns the integer number zero.
        */
        public AbelianGroup.Member zero() {
                return ZERO;
        }
        /**
        * Returns true if the integer number is equal to zero.
        */
        public boolean isZero(AbelianGroup.Member g) {
                return ZERO.equals(g);
        }
        /**
        * Returns true if one integer number is the negative of the other.
        */
        public boolean isNegative(AbelianGroup.Member a, AbelianGroup.Member b) {
                return ZERO.equals(a.add(b));
        }
        /**
        * Returns the integer number one.
        */
        public Ring.Member one() {
                return ONE;
        }
        /**
        * Returns true if the integer number is equal to one.
        */
        public boolean isOne(Ring.Member r) {
                return ONE.equals(r);
        }
}