Contents | Prev | Next | Index

`java.lang.Integer`

public final class`extends Number { public static final int`

Integer`= 0x80000000; public static final int`

MIN_VALUE`= 0x7fffffff; public`

MAX_VALUE`(int value); public`

Integer`(String s)`

Integer

throws NumberFormatException; public String`(); public boolean`

toString`(Object obj); public int`

equals`(); public int`

hashCode`(); public long`

intValue`(); public float`

longValue`(); public double`

floatValue`(); public static String`

doubleValue`(int i); public static String`

toString`(int i, int radix); public static String`

toString`(long i); public static String`

toHexString`(long i); public static String`

toOctalString`(long i); public static int`

toBinaryString`(String s)`

parseInt

throws NumberFormatException; public static int`(String s, int radix)`

parseInt

throws NumberFormatException; public static Integer`(String s)`

valueOf

throws NumberFormatException; public static Integer`(String s, int radix)`

valueOf

throws NumberFormatException; public static Integer`(String nm); public static Integer`

getInteger`(String nm, int val); public static Integer`

getInteger`(String nm, Integer val); }`

getInteger

**20.7.1 ** `public static final int `

= 0x80000000;**MIN_VALUE**

The constant value of this field is `-2147483648`

, the lowest value of type `int`

.

**20.7.2 ** `public static final int `

= 0x7fffffff;**MAX_VALUE**

The constant value of this field is `2147483647`

, the highest value of type `int`

.

**20.7.3 ** `public `

(int value)**Integer**

This constructor initializes a newly created `Integer`

object so that it represents
the primitive value that is the argument.

**20.7.4 ** `public `

(String s) throws NumberFormatException**Integer**

This constructor initializes a newly created `Integer`

object so that it represents
the integer represented by the string in decimal form. The string is converted to an
`int`

in exactly the manner used by the `parseInt`

method (§20.7.18) for radix 10.

**20.7.5 ** `public String `

()**toString**

The integer value represented by this `Integer`

object is converted to signed decimal
representation and returned as a string, exactly as if the integer value were
given as an argument to the `toString`

method that takes one argument (§20.7.12).

Overrides the `toString`

method of `Object`

(§20.1.2).

**20.7.6 ** `public boolean `

(Object obj)**equals**

The result is `true`

if and only if the argument is not `null`

and is an `Integer`

object that represents the same `int`

value as this `Integer`

object.

Overrides the `equals`

method of `Object`

(§20.1.3).

**20.7.7 ** `public int `

()**hashCode**

The result is the primitive `int`

value represented by this `Integer`

object.

Overrides the `hashCode`

method of `Object`

(§20.1.4).

**20.7.8 ** `public int `

()**intValue**

The `int`

value represented by this `Integer`

object is returned.

Overrides the `intValue`

method of `Number`

(§20.6.1).

**20.7.9 ** `public long `

()**longValue**

The `int`

value represented by this `Integer`

object is converted (§5.1.2) to type
`long`

and the result of the conversion is returned.

Overrides the `longValue`

method of `Number`

(§20.6.2).

**20.7.10 ** `public float `

()**floatValue**

The `int`

value represented by this `Integer`

object is converted (§5.1.2) to type
`float`

and the result of the conversion is returned.

Overrides the `floatValue`

method of `Number`

(§20.6.3).

**20.7.11 ** `public double `

()**doubleValue**

The `int`

value represented by this `Integer`

object is converted (§5.1.2) to type
`double`

and the result of the conversion is returned.

Overrides the `doubleValue`

method of `Number`

(§20.6.4).

**20.7.12 ** `public static String `

(int i)**toString**

The argument is converted to signed decimal representation and returned as a
string, exactly as if the argument and the radix `10`

were given as arguments to the
`toString`

method that takes two arguments (§20.7.13).

**20.7.13 ** `public static String `

(int i, int radix)**toString**

The first argument is converted to a signed representation in the radix specified by the second argument; this representation is returned as a string.

If the `radix`

is smaller than `Character.MIN_RADIX`

(§20.5.3) or larger than `Character.MAX_RADIX`

(§20.5.4), then the value `10`

is used instead.

If the first argument is negative, the first character of the result will be the character `'-'`

(`'\u002d'`

). If the first argument is not negative, no sign character appears in the result.

The remaining characters of the result represent the magnitude of the first argument. If the magnitude is zero, it is represented by a single zero character `'0'`

(`'\u0030'`

); otherwise, the first character of the representation of the magnitude will not be the zero character.The following ASCII characters are used as digits:

```
0123456789abcdefghijklmnopqrstuvwxyz
```

These are `'\u0030'`

through `'\u0039'`

and `'\u0061'`

through `'\u007a'`

. If the
`radix`

is `0123456789abcdef`

.
If uppercase letters are desired, the `toUpperCase`

method (§20.12.36) of class
`String`

may be called on the result:
Integer.toString(n, 16).toUpperCase()

**20.7.14 ** `public static String `

(int i)**toHexString**

The argument is converted to an unsigned representation in hexadecimal radix (base 16); this representation is returned as a string.

The result represents the unsigned magnitude of the argument. This equals the argument plus if the argument is negative; otherwise, it equals the argument.

If the unsigned magnitude is zero, it is represented by a single zero character `'0'`

(`'\u0030'`

); otherwise, the first character of the representation of the unsigned magnitude will not be the zero character. The following characters are used as hexadecimal digits:

```
0123456789abcdef
```

These are the characters `'\u0030'`

through `'\u0039'`

and `'\u0061'`

through
`'\u0066'`

. If uppercase letters are desired, the `toUpperCase`

method (§20.12.36)
of class `String`

may be called on the result:
Long.toHexString(n).toUpperCase()

**20.7.15 ** `public static String `

(int i)**toOctalString**

The argument is converted to an unsigned representation in octal radix (base 8); this representation is returned as a string.

The result represents the unsigned magnitude of the argument. This equals the argument plus if the argument is negative; otherwise, it equals the argument.

If the unsigned magnitude is zero, it is represented by a single zero character `'0'`

(`'\u0030'`

); otherwise, the first character of the representation of the unsigned magnitude will not be the zero character. The octal digits are:

```
01234567
```

These are the characters `'\u0030'`

through `'\u0037'`

.
**20.7.16 ** `public static String `

(int i)**toBinaryString**

The argument is converted to an unsigned representation in binary radix (base 2); this representation is returned as a string.

The result represents the unsigned magnitude of the argument. This equals the argument plus if the argument is negative; otherwise, it equals the argument.

If the unsigned magnitude is zero, it is represented by a single zero character `'0'`

(`'\u0030'`

); otherwise, the first character of the representation of the unsigned magnitude will not be the zero character. The characters `'0'`

(`'\u0030'`

) and `'1'`

(`'\u0031'`

) are used as binary digits.

**20.7.17 ** `public static int `

(String s)**parseInt**

throws NumberFormatException

The argument is interpreted as representing a signed decimal integer. The components
of the string must all be decimal digits, except that the first character may be
`'-'`

(`'\u002d'`

) to indicate a negative value. The resulting integer value is
returned, exactly as if the argument and the radix `10`

were given as arguments to
the `parseInt`

method that takes two arguments (§20.7.18).

**20.7.18 ** `public static int `

(String s, int radix)**parseInt**

throws NumberFormatException

The first argument is interpreted as representing a signed integer in the radix specified
by the second argument. The components of the string must all be digits of
the specified radix (as determined by whether `Character.digit`

(§20.5.23)
returns a nonnegative value), except that the first character may be `'-'`

(`'\u002d'`

) to indicate a negative value. The resulting integer value is returned.

An exception of type `NumberFormatException`

is thrown if any of the following situations occurs:

- The first argument is
`null`

or is a string of length zero. - The
`radix`

is either smaller than`Character.MIN_RADIX`

(§20.5.3) or larger than`Character.MAX_RADIX`

(§20.5.4). - Any character of the string is not a digit of the specified
`radix`

, except that the first character may`be`

a minus sign`'-'`

(`'\u002d'`

) provided that the string is longer than length 1. - The integer value represented by the string is not a value of type
`int`

.

parseInt("0", 10) returns 0 parseInt("473", 10) returns 473 parseInt("-0", 10) returns 0 parseInt("-FF", 16) returns -255 parseInt("1100110", 2) returns 102 parseInt("2147483647", 10) returns 2147483647 parseInt("-2147483648", 10) returns -2147483648 parseInt("2147483648", 10) throws a NumberFormatException parseInt("99", 8) throws a NumberFormatException parseInt("Kona", 10) throws a NumberFormatException parseInt("Kona", 27) returns 411787

**20.7.19 ** `public static Integer `

(String s)**valueOf**

throws NumberFormatException

The argument is interpreted as representing a signed decimal integer, exactly as if
the argument were given to the `parseInt`

method that takes one argument
(§20.7.17). The result is an `Integer`

object that represents the integer value specified
by the string.

In other words, this method returns an `Integer`

object equal to the value of:

new Integer(Integer.parseInt(s))

**20.7.20 ** `public static Integer `

(String s, int radix)**valueOf**

throws NumberFormatException

The first argument is interpreted as representing a signed integer in the radix specified
by the second argument, exactly as if the arguments were given to the
`parseInt`

method that takes two arguments (§20.7.18). The result is an `Integer`

object that represents the integer value specified by the string.

In other words, this method returns an `Integer`

object equal to the value of:

new Integer(Integer.parseInt(s, radix))

**20.7.21 ** `public static Integer `

(String nm)**getInteger**

The first argument is treated as the name of a system property to be obtained as if
by the method `System.getProperty`

(§20.18.9). The string value of this property
is then interpreted as an integer value and an `Integer`

object representing this
value is returned. If there is no property of the specified name, or if the property
does not have the correct numeric format, then `null`

is returned.

In other words, this method returns an `Integer`

object equal to the value of:

getInteger(nm, null)

**20.7.22 ** `public static Integer `

(String nm, int val)**getInteger**

The first argument is treated as the name of a system property to be obtained as if
by the method `System.getProperty`

(§20.18.9). The string value of this property
is then interpreted as an integer value and an `Integer`

object representing this
value is returned. If the property does not have the correct numeric format, then an
`Integer`

object that represents the value of the second argument is returned.

In other words, this method returns an `Integer`

object equal to the value of:

getInteger(nm, new Integer(val))but in practice it may be implemented in a manner such as:

Integer result = getInteger(nm, null); return (result == null) ? new Integer(val) : result;to avoid the unnecessary allocation of an

`Integer`

object when the default value is
not needed.
**20.7.23 ** `public static Integer `

(String nm, Integer val)**getInteger**

The first argument is treated as the name of a system property to be obtained as if
by the method `System.getProperty`

(§20.18.9). The string value of this property
is then interpreted as an integer value and an `Integer`

object representing this
value is returned.

- If the property value begins with the two ASCII characters
`0x`

or the ASCII character`#`

, not followed by a minus sign, then the rest of it is parsed as a hexadecimal integer exactly as for the method`Integer.valueOf`

(§20.7.20) with radix`16`

. - If the property value begins with the ASCII character
`0`

followed by another character, it is parsed as an octal integer exactly as for the method`Integer.valueOf`

(§20.7.20) with radix`8`

. - Otherwise, the property value is parsed as a decimal integer exactly as for the method
`Integer.valueOf`

(§20.7.20) with radix`10`

.

Contents | Prev | Next | Index

Java Language Specification (HTML generated by Suzette Pelouch on February 24, 1998)

*Copyright © 1996 Sun Microsystems, Inc.
All rights reserved*

Please send any comments or corrections to doug.kramer@sun.com

Spec-Zone.ru - all specs in one place