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Number
public abstract class Number
extends Object
implements Serializable
Known direct subclasses AtomicInteger, AtomicLong, BigDecimal, BigInteger, Byte, Double, DoubleAccumulator, DoubleAdder, Float, Half, Integer, Long, LongAccumulator, LongAdder, Rational, Short AtomicInteger | An int value that may be updated atomically. | AtomicLong | A long value that may be updated atomically. | BigDecimal | The BigDecimal class implements immutable arbitrary-precision decimal numbers. | BigInteger | Immutable arbitrary-precision integers. | Byte | The Byte class wraps a value of primitive type byte in an object. | Double | The Double class wraps a value of the primitive type double in an object. | DoubleAccumulator | One or more variables that together maintain a running double value updated using a supplied function. | DoubleAdder | One or more variables that together maintain an initially zero double sum. | Float | The Float class wraps a value of primitive type float in an object. | Half | The Half class is a wrapper and a utility class to manipulate half-precision 16-bit IEEE 754 floating point data types (also called fp16 or binary16). | Integer | The Integer class wraps a value of the primitive type int in an object. | Long | The Long class wraps a value of the primitive type long in an object. | LongAccumulator | One or more variables that together maintain a running long value updated using a supplied function. | LongAdder | One or more variables that together maintain an initially zero long sum. | Rational | An immutable data type representation a rational number. | Short | The Short class wraps a value of primitive type short in an object. | |
The abstract class Number
is the superclass of platform classes representing numeric values that are convertible to the primitive types byte
, double
, float
, int
, long
, and short
. The specific semantics of the conversion from the numeric value of a particular Number
implementation to a given primitive type is defined by the Number
implementation in question. For platform classes, the conversion is often analogous to a narrowing primitive conversion or a widening primitive conversion as defined in The Java Language Specification for converting between primitive types. Therefore, conversions may lose information about the overall magnitude of a numeric value, may lose precision, and may even return a result of a different sign than the input. See the documentation of a given Number
implementation for conversion details.
Summary
Public constructors |
Number() Constructor for subclasses to call. |
Public methods |
byte | byteValue() Returns the value of the specified number as a byte . |
abstract double | doubleValue() Returns the value of the specified number as a double . |
abstract float | floatValue() Returns the value of the specified number as a float . |
abstract int | intValue() Returns the value of the specified number as an int . |
abstract long | longValue() Returns the value of the specified number as a long . |
short | shortValue() Returns the value of the specified number as a short . |
Inherited methods |
From class java.lang.Object Object | clone() Creates and returns a copy of this object. | boolean | equals(Object obj) Indicates whether some other object is "equal to" this one. | void | finalize() Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. | final Class<?> | getClass() Returns the runtime class of this Object . | int | hashCode() Returns a hash code value for the object. | final void | notify() Wakes up a single thread that is waiting on this object's monitor. | final void | notifyAll() Wakes up all threads that are waiting on this object's monitor. | String | toString() Returns a string representation of the object. | final void | wait(long timeoutMillis, int nanos) Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed. | final void | wait(long timeoutMillis) Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed. | final void | wait() Causes the current thread to wait until it is awakened, typically by being notified or interrupted. | |
Public constructors
Number
public Number ()
Constructor for subclasses to call.
Public methods
byteValue
public byte byteValue ()
Returns the value of the specified number as a byte
.
Implementation Requirements:
- The default implementation returns the result of
intValue()
cast to a byte
.
Returns |
byte | the numeric value represented by this object after conversion to type byte . |
doubleValue
public abstract double doubleValue ()
Returns the value of the specified number as a double
.
Returns |
double | the numeric value represented by this object after conversion to type double . |
floatValue
public abstract float floatValue ()
Returns the value of the specified number as a float
.
Returns |
float | the numeric value represented by this object after conversion to type float . |
intValue
public abstract int intValue ()
Returns the value of the specified number as an int
.
Returns |
int | the numeric value represented by this object after conversion to type int . |
longValue
public abstract long longValue ()
Returns the value of the specified number as a long
.
Returns |
long | the numeric value represented by this object after conversion to type long . |
shortValue
public short shortValue ()
Returns the value of the specified number as a short
.
Implementation Requirements:
- The default implementation returns the result of
intValue()
cast to a short
.
Returns |
short | the numeric value represented by this object after conversion to type short . |
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Last updated 2025-03-13 UTC.
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