Package javax.json

Interface JsonNumber

All Superinterfaces:
JsonValue
public interface JsonNumber extends JsonValue
An immutable JSON number value.

Implementations may use a BigDecimal object to store the numeric value internally. The BigDecimal object can be constructed from the following types: int, long, BigInteger, double, and String. Some of the method semantics in this class are defined using the BigDecimal semantics.

  • Method Details

    • isIntegral

      boolean isIntegral()
      Returns true if this JSON number is a integral number. This method semantics are defined using bigDecimalValue().scale(). If the scale is zero, then it is considered integral type. This integral type information can be used to invoke an appropriate accessor method to obtain a numeric value as in the following example: 
       
 JsonNumber num = ...
 if (num.isIntegral()) {
     num.longValue();     // or other methods to get integral value
 } else {
     num.doubleValue();   // or other methods to get decimal number value
 }
      Returns:
      true if this number is a integral number, otherwise false

    • intValue

      int intValue()
      Returns this JSON number as an int. Note that this conversion can lose information about the overall magnitude and precision of the number value as well as return a result with the opposite sign.
      Returns:
      an int representation of the JSON number
      See Also:

    • intValueExact

      int intValueExact()
      Returns this JSON number as an int.
      Returns:
      an int representation of the JSON number
      Throws:
      ArithmeticException - if the number has a nonzero fractional part or if it does not fit in an int
      See Also:

    • longValue

      long longValue()
      Returns this JSON number as a long. Note that this conversion can lose information about the overall magnitude and precision of the number value as well as return a result with the opposite sign.
      Returns:
      a long representation of the JSON number.
      See Also:

    • longValueExact

      long longValueExact()
      Returns this JSON number as a long.
      Returns:
      a long representation of the JSON number
      Throws:
      ArithmeticException - if the number has a non-zero fractional part or if it does not fit in a long
      See Also:

    • bigIntegerValue

      BigInteger bigIntegerValue()
      Returns this JSON number as a BigInteger object. This is a a convenience method for bigDecimalValue().toBigInteger(). Note that this conversion can lose information about the overall magnitude and precision of the number value as well as return a result with the opposite sign.
      Returns:
      a BigInteger representation of the JSON number.
      See Also:

    • bigIntegerValueExact

      BigInteger bigIntegerValueExact()
      Returns this JSON number as a BigDecimal object. This is a convenience method for bigDecimalValue().toBigIntegerExact().
      Returns:
      a BigInteger representation of the JSON number
      Throws:
      ArithmeticException - if the number has a nonzero fractional part
      See Also:

    • doubleValue

      double doubleValue()
      Returns this JSON number as a double. This is a a convenience method for bigDecimalValue().doubleValue(). Note that this conversion can lose information about the overall magnitude and precision of the number value as well as return a result with the opposite sign.
      Returns:
      a double representation of the JSON number
      See Also:

    • bigDecimalValue

      BigDecimal bigDecimalValue()
      Returns this JSON number as a BigDecimal object.
      Returns:
      a BigDecimal representation of the JSON number

    • toString

      String toString()
      Returns a JSON text representation of the JSON number. The representation is equivalent to BigDecimal.toString().
      Specified by:
      toString in interface JsonValue
      Overrides:
      toString in class Object
      Returns:
      JSON text representation of the number

    • equals

      boolean equals(Object obj)
      Compares the specified object with this JsonNumber object for equality. Returns true if and only if the type of the specified object is also JsonNumber and their bigDecimalValue() objects are equal
      Overrides:
      equals in class Object
      Parameters:
      obj - the object to be compared for equality with this JsonNumber
      Returns:
      true if the specified object is equal to this JsonNumber

    • hashCode

      int hashCode()
      Returns the hash code value for this JsonNumber object. The hash code of a JsonNumber object is defined as the hash code of its bigDecimalValue() object.
      Overrides:
      hashCode in class Object
      Returns:
      the hash code value for this JsonNumber object