Class Number

• java.lang.Object
• • java.lang.Number

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

AtomicInteger, AtomicLong, BigDecimal, BigInteger, Byte, Double, DoubleAccumulator, DoubleAdder, Float, Integer, Long, LongAccumulator, LongAdder, Short

public abstract class Number
extends Object
implements Serializable

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 defining 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.

Since:

JDK1.0

Constructors

Number

public Number()

Methods

intValue

public abstract int intValue()

Returns the value of the specified number as an int, which may involve rounding or truncation.

Returns:

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, which may involve rounding or truncation.

Returns:

the numeric value represented by this object after conversion to type long.

floatValue

public abstract float floatValue()

Returns the value of the specified number as a float, which may involve rounding.

Returns:

the numeric value represented by this object after conversion to type float.

doubleValue

public abstract double doubleValue()

Returns the value of the specified number as a double, which may involve rounding.

Returns:

the numeric value represented by this object after conversion to type double.

byteValue

public byte byteValue()

Returns:

the numeric value represented by this object after conversion to type byte.

Since:

JDK1.1

shortValue

public short shortValue()

Returns:

the numeric value represented by this object after conversion to type short.

Since:

JDK1.1