The java.math.BigDecimal.equals() method compares this BigDecimal with the specified Object for equality. it evaluates to 0.00 instead of 0).You probably want to consider that it's equal to zero. Method returns true only when both bigdecimal objects as operands for the methods possess same value and same scale. Java BigDecimal equals example. Two BigDecimal objects that are equal in value but have a different scale (like 2.0 and 2.00) are considered equal by this method. Method evaluates bigdecimal object values as well as the scales allocated to the values. Java BigDecimal class hierarchy. Arbitrary-precision signed decimal numbers. Il se compose de deux parties: Valeur non mise à l’échelle - un entier de précision arbitraire Scale - un entier de 32 bits représentant le nombre de chiffres du à droite de la virgule Par exemple, le BigDecimal 3.14 a la valeur non mise à l’échelle de 314 et l’échelle de 2.

For a statement like bd1.compareTo(bd2) this method returns - -1 … Unlike compareTo, this method considers two BigDecimal objects equal only if they are equal in value and scale (thus 2.0 is not equal to 2.00 when compared by this method). Uses of Class java.math.BigDecimal. The reason you can't use BigDecimal#equals() is that it takes scale into consideration: new BigDecimal("0").equals(BigDecimal.ZERO) // true new BigDecimal("0.00").equals(BigDecimal.ZERO) // false! BigDecimal - Scala Standard Library 2.11.8 - scala.math.BigDecimal. For example, a scale of -3 means the unscaled value is multiplied by 1000. A BigDecimal consists of an arbitrary precision integer unscaled value and a 32-bit integer scale. The BigDecimal class gives its user complete control over rounding behavior, forcing the user to explicitly specify a rounding behavior for operations capable of discarding precision ( … Examples:

Notes: The results of this constructor can be somewhat unpredictable. It performs the operations of java.lang.Math class and it is used to fetch precision, round, unit in the last place (ULP), engineering notation values etc. If greater than or equal to zero, the scale is the number of digits to the right of the decimal point. A BigDecimal is defined by two values: an arbitrary precision integer and a 32-bit integer scale.The value of the BigDecimal is defined to be .. A BigDecimal consists of a random precision integer unscaled value and a 32-bit integer scale. equals() method is available in java.math package. Packages that use BigDecimal ; Package Description; java.math : Provides classes for performing arbitrary-precision integer arithmetic (BigInteger) and arbitrary-precision decimal arithmetic (BigDecimal). so it's unsuitable for a purely numeric comparison.

Translates a double into a BigDecimal which is the exact decimal representation of the double's binary floating-point value.The scale of the returned BigDecimal is the smallest value such that (10 scale × val) is an integer. For instance, for the number 123.45, the precision returned is 5. It breaks the usual Java convention that Comparable is consistent with equality. Scale handling. However, in some cases code is … 这两天在处理支付金额校验的时候出现了点问题，有个金额比较我用了BigDecimal的equals方法来比较两个金额是否相等，结果导致金额比较出现错误（比如3.0与3.00的比较等）。【注：以下所讲都是以sun jdk 1.4.2版本为例，其他版本实现未必一致，请忽略】 首先看一下BigDecimal的equals方 …
public class BigDecimal extends Number implements Comparable Various Operations provided by Java BigDecimal class includes. compareTo (BigDecimal) Returns -1, 0 or 1 as this number is less than, equal to, or greater than val. If negative, the unscaled value of the number is multiplied by ten to the power of the negation of the scale. BigDecimal provides operations for basic arithmetic, scale manipulation, comparison, hashing, and format conversion. (Another proof, if any were needed, that Loki or one of his avatars is alive and well and has moved into software development.) So, precision indicates the length of the arbitrary precision integer. However, BigDecimal.compareTo() doesn't consider scale when comparing: Cast the receiver object to be of type T0.. 1798 * @see #divideToIntegralValue(java.math.BigDecimal, java.math.MathContext) 1799 * @see #remainder(java.math.BigDecimal, java.math.MathContext) 1800 * @since 1.5 1801 */ 1802 public BigDecimal [] divideAndRemainder(BigDecimal divisor) {1803 … For example, stripping the trailing zeros from the BigDecimal value 600.0, which has [BigInteger, scale] components equals to [6000, 1], yields 6E2 with [BigInteger, scale] components equals to [6, -2]. The java.math.BigDecimal.stripTrailingZeros() returns a BigDecimal which is numerically equal to this one but with any trailing zeros removed from the representation. This page will walk through java BigDecimal tutorial with example. Rounding-off arithmetics.

Precision: The precision is the number of digits in the unscaled value.

If less than zero, the unscaled value of the number is multiplied by 10^(-scale).

Comparison based calculations.

one.equals(two) == false There are benefits of doing the comparison this way since the number of decimal places are considered.
If zero or positive, the scale is the number of digits to the right of the decimal point. An extra word of warning is called for. Scale: If zero or positive, the scale is the number of digits to the right of the decimal point. Returns a BigDecimal whose value is (this + val), and whose scale is MAX(this.scale(), val.scale).