Module java.rmi
Package java.rmi.dgc

# Class VMID

java.lang.Object
java.rmi.dgc.VMID

All Implemented Interfaces:
  `Serializable`

public final class VMID extends Object implements Serializable
A VMID is a identifier that is unique across all Java virtual machines. VMIDs are used by the distributed garbage collector to identify client VMs.

See Also:
  - Serialized Form

## Constructor Summary

Constructors
Constructor
Description
`VMID()`
Create a new VMID.

## Method Summary

Modifier and Type
Method
Description
`boolean`
`equals(Object obj)`
Compare this VMID to another, and return true if they are the same identifier.
`int`
`hashCode()`
Compute hash code for this VMID.
`static boolean`
`isUnique()`
Deprecated.
`String`
`toString()`
Return string representation of this VMID.

### Methods declared in class java.lang.Object

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

## Constructor Details

### VMID

public VMID()
Create a new VMID. Each new VMID returned from this constructor is unique for all Java virtual machines under the following conditions: a) the conditions for uniqueness for objects of the class `java.rmi.server.UID` are satisfied, and b) an address can be obtained for this host that is unique and constant for the lifetime of this object.

## Method Details

### isUnique

@Deprecated public static boolean isUnique()
Deprecated.
Return true if an accurate address can be determined for this host. If false, reliable VMID cannot be generated from this host

Returns:
  true if host address can be determined, false otherwise

### hashCode

public int hashCode()
Compute hash code for this VMID.

Overrides:
  `hashCode` in class `Object`
Returns:
  a hash code value for this object.
See Also:
  - `Object.equals(java.lang.Object)`
  - `System.identityHashCode(java.lang.Object)`

### equals

public boolean equals(Object obj)
Compare this VMID to another, and return true if they are the same identifier.

Overrides:
  `equals` in class `Object`
Parameters:
  `obj` - the reference object with which to compare.
Returns:
  `true` if this object is the same as the obj argument; `false` otherwise.
See Also:
  - `Object.hashCode()`
  - `HashMap`

### toString

public String toString()
Return string representation of this VMID.

Overrides:
  `toString` in class `Object`
Returns:
  a string representation of the object.