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 BigDecimal.BigDecimal(int), long BigDecimal.BigDecimal(long), BigInteger BigDecimal.BigDecimal(BigInteger), double BigDecimal.valueOf(double), and String BigDecimal.BigDecimal(String). Some of the method semantics in this class are defined using the BigDecimal semantics.

Nested Class Summary

Nested classes/interfaces inherited from interface javax.json.JsonValue

JsonValue.ValueType

Field Summary

Fields inherited from interface javax.json.JsonValue

EMPTY_JSON_ARRAY, EMPTY_JSON_OBJECT, FALSE, NULL, TRUE

Method Summary

Modifier and Type	Method and Description
BigDecimal	bigDecimalValue() Returns this JSON number as a BigDecimal object.
BigInteger	bigIntegerValue() Returns this JSON number as a BigInteger object.
BigInteger	bigIntegerValueExact() Returns this JSON number as a BigInteger object.
double	doubleValue() Returns this JSON number as a double.
boolean	equals(Object obj) Compares the specified object with this JsonNumber object for equality.
int	hashCode() Returns the hash code value for this JsonNumber object.
int	intValue() Returns this JSON number as an int.
int	intValueExact() Returns this JSON number as an int.
boolean	isIntegral() Returns true if this JSON number is a integral number.
long	longValue() Returns this JSON number as a long.
long	longValueExact() Returns this JSON number as a long.
default Number	numberValue() Returns this JSON number as a Number object.
String	toString() Returns a JSON text representation of the JSON number.

Methods inherited from interface javax.json.JsonValue

asJsonArray, asJsonObject, getValueType

Method Detail

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:

BigDecimal.intValue()

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:

BigDecimal.intValueExact()

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:

BigDecimal.longValue()

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:

BigDecimal.longValueExact()

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:

BigDecimal.toBigInteger()

bigIntegerValueExact

BigInteger bigIntegerValueExact()

Returns this JSON number as a BigInteger 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:

BigDecimal.toBigIntegerExact()

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:

BigDecimal.doubleValue()

bigDecimalValue

BigDecimal bigDecimalValue()

Returns this JSON number as a BigDecimal object.

Returns:

a BigDecimal representation of the JSON number

numberValue

default Number numberValue()

Returns this JSON number as a Number object.

Returns:

a Number representation of the JSON number

Since:

1.1

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