The java.math package contains the BigInteger class for arbitrary-precision integer arithmetic, which is useful for cryptography. It also contains the BigDecimal class for arbitrary precision decimal floating-point arithmetic, which is useful for financial applications that need to be careful about rounding errors. The BigDecimal class is greatly enhanced in Java 5.0 and is accompanied by the new types MathContext and RoundingMode.

Enumerated Types

public enum RoundingMode;

Classes

public class BigDecimal extends Number implements Comparable<BigDecimal>;
public class BigInteger extends Number implements Comparable<BigInteger>;
public final class MathContext implements Serializable;