THE PACKAGE JAVA.LANG

java.lang.Number

20.6

20.6 The Class

java.lang.Number

The abstract class

Number

 has subclasses

Integer

,

Long

,

Float

, and

Double

which wrap primitive types, defining abstract methods to convert the represented

numeric value to

int

,

long

,

float

, and

double

.

public abstract class Number {

public abstract int intValue();

public abstract long longValue();

public abstract float floatValue();

public abstract double doubleValue();

}

20.6.1

public abstract int intValue()

The general contract of the

intValue

 method is that it returns the numeric value

represented by this

Number

 object after converting it to type

int

.

Overridden by

Integer

 ( 20.7.8),

Long

 ( 20.8.8),

Float

 ( 20.9.12), and

Double

 ( 20.10.11).

20.6.2

public abstract long longValue()

The general contract of the

longValue

 method is that it returns the numeric value

represented by this

Number

 object after converting it to type

long

.

Overridden by

Integer

 ( 20.7.9),

Long

 ( 20.8.9),

Float

 ( 20.9.13), and

Double

 ( 20.10.12).

20.6.3

public abstract float floatValue()

The general contract of the

floatValue

 method is that it returns the numeric

value represented by this

Number

 object after converting it to type

float

.

Overridden by

Integer

 ( 20.7.10),

Long

 ( 20.8.10),

Float

 ( 20.9.14), and

Double

 ( 20.10.13).

20.6.4

public abstract double doubleValue()

The general contract of the

doubleValue

 method is that it returns the numeric

value represented by this

Number

 object after converting it to type

double

.

Overridden by

Integer

 ( 20.7.11),

Long

 ( 20.8.11),

Float

 ( 20.9.15), and

Double

 ( 20.10.14).

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