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Showing content from https://docs.oracle.com/javase/8/docs/api/java/lang/Number.html below:

Number (Java Platform SE 8 )

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

See Also:

Serialized Form

See The Java™ Language Specification:

5.1.2 Widening Primitive Conversions, 5.1.3 Narrowing Primitive Conversions

- Constructor Summary Constructors Constructor Description Number()
- Method Summary All Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method Description byte byteValue()
  Returns the value of the specified number as a byte, which may involve rounding or truncation.
  abstract double doubleValue()
  Returns the value of the specified number as a double, which may involve rounding.
  abstract float floatValue()
  Returns the value of the specified number as a float, which may involve rounding.
  abstract int intValue()
  Returns the value of the specified number as an int, which may involve rounding or truncation.
  abstract long longValue()
  Returns the value of the specified number as a long, which may involve rounding or truncation.
  short shortValue()
  Returns the value of the specified number as a short, which may involve rounding or truncation.
  - Methods inherited from class java.lang.Objectclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - Number
```
public Number()
```
- Method Detail
  - 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 value of the specified number as a
    byte
    , which may involve rounding or truncation.
    
    This implementation returns the result of intValue() cast to a byte.
    
    Returns:
    
    the numeric value represented by this object after conversion to type byte.
    
    Since:
    
    JDK1.1
  - shortValue
```
public short shortValue()
```
    Returns the value of the specified number as a
    short
    , which may involve rounding or truncation.
    
    This implementation returns the result of intValue() cast to a short.
    
    Returns:
    
    the numeric value represented by this object after conversion to type short.
    
    Since:
    
    JDK1.1

Submit a bug or feature For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples. Copyright © 1993, 2025, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.

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