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## java.lang
Class Number

    java.lang.Object
      |
      +--java.lang.Number

All Implemented Interfaces:
  Serializable

Direct Known Subclasses:
  BigDecimal, BigInteger, Byte, Double, Float, Integer, Long, Short

public abstract class Number
extends Object
implements Serializable

The abstract class `Number` is the superclass of classes `BigDecimal`, `BigInteger`, `Byte`, `Double`, `Float`, `Integer`, `Long`, and `Short`.

Subclasses of `Number` must provide methods to convert the represented numeric value to `byte`, `double`, `float`, `int`, `long`, and `short`.

Since:
  JDK1.0
See Also:
  `Byte`, `Double`, `Float`, `Integer`, `Long`, `Short`, Serialized Form

Constructor Summary
`Number()`

Method Summary
`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`.

Methods inherited from class java.lang.Object
`clone, 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`. This 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`. This 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`. This 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`. This 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`. This may involve rounding or truncation.

  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`. This may involve rounding or truncation.

  Returns:
    the numeric value represented by this object after conversion to type `short`.
  Since:
    JDK1.1

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.