程序包 java.net

类 Inet4Address

java.lang.Object

java.net.InetAddress

java.net.Inet4Address

所有已实现的接口:

Serializable

public final class Inet4Address
extends InetAddress

This class represents an Internet Protocol version 4 (IPv4) address. Defined by RFC 790: Assigned Numbers, RFC 1918: Address Allocation for Private Internets, and RFC 2365: Administratively Scoped IP Multicast

Textual representation of IP addresses

Textual representation of IPv4 address used as input to methods takes one of the following forms:

d.d.d.d

d.d.d

d.d

d

When four parts are specified, each is interpreted as a byte of data and assigned, from left to right, to the four bytes of an IPv4 address.

When a three part address is specified, the last part is interpreted as a 16-bit quantity and placed in the right most two bytes of the network address. This makes the three part address format convenient for specifying Class B net- work addresses as 128.net.host.

When a two part address is supplied, the last part is interpreted as a 24-bit quantity and placed in the right most three bytes of the network address. This makes the two part address format convenient for specifying Class A network addresses as net.host.

When only one part is given, the value is stored directly in the network address without any byte rearrangement.

For methods that return a textual representation as output value, the first form, i.e. a dotted-quad string, is used.

The Scope of a Multicast Address

Historically the IPv4 TTL field in the IP header has doubled as a multicast scope field: a TTL of 0 means node-local, 1 means link-local, up through 32 means site-local, up through 64 means region-local, up through 128 means continent-local, and up through 255 are global. However, the administrative scoping is preferred. Please refer to RFC 2365: Administratively Scoped IP Multicast

从以下版本开始:

1.4

另请参阅:

序列化表格

方法概要

限定符和类型	方法	说明
boolean	equals(Object obj)	Compares this object against the specified object.
byte[]	getAddress()	Returns the raw IP address of this InetAddress object.
String	getHostAddress()	Returns the IP address string in textual presentation form.
int	hashCode()	Returns a hashcode for this IP address.
boolean	isAnyLocalAddress()	Utility routine to check if the InetAddress in a wildcard address.
boolean	isLinkLocalAddress()	Utility routine to check if the InetAddress is an link local address.
boolean	isLoopbackAddress()	Utility routine to check if the InetAddress is a loopback address.
boolean	isMCGlobal()	Utility routine to check if the multicast address has global scope.
boolean	isMCLinkLocal()	Utility routine to check if the multicast address has link scope.
boolean	isMCNodeLocal()	Utility routine to check if the multicast address has node scope.
boolean	isMCOrgLocal()	Utility routine to check if the multicast address has organization scope.
boolean	isMCSiteLocal()	Utility routine to check if the multicast address has site scope.
boolean	isMulticastAddress()	Utility routine to check if the InetAddress is an IP multicast address.
boolean	isSiteLocalAddress()	Utility routine to check if the InetAddress is a site local address.

从类继承的方法 java.net.InetAddress

getAllByName, getByAddress, getByAddress, getByName, getCanonicalHostName, getHostName, getLocalHost, getLoopbackAddress, isReachable, isReachable, toString

从类继承的方法 java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

方法详细资料

isMulticastAddress

public boolean isMulticastAddress()

Utility routine to check if the InetAddress is an IP multicast address. IP multicast address is a Class D address i.e first four bits of the address are 1110.

覆盖:

isMulticastAddress 在类中 InetAddress

返回:

a boolean indicating if the InetAddress is an IP multicast address

从以下版本开始:

JDK1.1

isAnyLocalAddress

public boolean isAnyLocalAddress()

Utility routine to check if the InetAddress in a wildcard address.

覆盖:

isAnyLocalAddress 在类中 InetAddress

返回:

a boolean indicating if the Inetaddress is a wildcard address.

从以下版本开始:

1.4

isLoopbackAddress

public boolean isLoopbackAddress()

Utility routine to check if the InetAddress is a loopback address.

覆盖:

isLoopbackAddress 在类中 InetAddress

返回:

a boolean indicating if the InetAddress is a loopback address; or false otherwise.

从以下版本开始:

1.4

isLinkLocalAddress

public boolean isLinkLocalAddress()

Utility routine to check if the InetAddress is an link local address.

覆盖:

isLinkLocalAddress 在类中 InetAddress

返回:

a boolean indicating if the InetAddress is a link local address; or false if address is not a link local unicast address.

从以下版本开始:

1.4

isSiteLocalAddress

public boolean isSiteLocalAddress()

Utility routine to check if the InetAddress is a site local address.

覆盖:

isSiteLocalAddress 在类中 InetAddress

返回:

a boolean indicating if the InetAddress is a site local address; or false if address is not a site local unicast address.

从以下版本开始:

1.4

isMCGlobal

public boolean isMCGlobal()

Utility routine to check if the multicast address has global scope.

覆盖:

isMCGlobal 在类中 InetAddress

返回:

a boolean indicating if the address has is a multicast address of global scope, false if it is not of global scope or it is not a multicast address

从以下版本开始:

1.4

isMCNodeLocal

public boolean isMCNodeLocal()

Utility routine to check if the multicast address has node scope.

覆盖:

isMCNodeLocal 在类中 InetAddress

返回:

a boolean indicating if the address has is a multicast address of node-local scope, false if it is not of node-local scope or it is not a multicast address

从以下版本开始:

1.4

isMCLinkLocal

public boolean isMCLinkLocal()

Utility routine to check if the multicast address has link scope.

覆盖:

isMCLinkLocal 在类中 InetAddress

返回:

a boolean indicating if the address has is a multicast address of link-local scope, false if it is not of link-local scope or it is not a multicast address

从以下版本开始:

1.4

isMCSiteLocal

public boolean isMCSiteLocal()

Utility routine to check if the multicast address has site scope.

覆盖:

isMCSiteLocal 在类中 InetAddress

返回:

a boolean indicating if the address has is a multicast address of site-local scope, false if it is not of site-local scope or it is not a multicast address

从以下版本开始:

1.4

isMCOrgLocal

public boolean isMCOrgLocal()

Utility routine to check if the multicast address has organization scope.

覆盖:

isMCOrgLocal 在类中 InetAddress

返回:

a boolean indicating if the address has is a multicast address of organization-local scope, false if it is not of organization-local scope or it is not a multicast address

从以下版本开始:

1.4

getAddress

public byte[] getAddress()

Returns the raw IP address of this InetAddress object. The result is in network byte order: the highest order byte of the address is in getAddress()[0].

覆盖:

getAddress 在类中 InetAddress

返回:

the raw IP address of this object.

getHostAddress

public String getHostAddress()

Returns the IP address string in textual presentation form.

覆盖:

getHostAddress 在类中 InetAddress

返回:

the raw IP address in a string format.

从以下版本开始:

JDK1.0.2

hashCode

public int hashCode()

Returns a hashcode for this IP address.

覆盖:

hashCode 在类中 InetAddress

返回:

a hash code value for this IP address.

另请参阅:

Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)

equals

public boolean equals(Object obj)

Compares this object against the specified object. The result is true if and only if the argument is not null and it represents the same IP address as this object.

Two instances of InetAddress represent the same IP address if the length of the byte arrays returned by getAddress is the same for both, and each of the array components is the same for the byte arrays.

覆盖:

equals 在类中 InetAddress

参数:

obj - the object to compare against.

返回:

true if the objects are the same; false otherwise.

另请参阅:

InetAddress.getAddress()