Java Module java.prefs Package java.util.prefs Class PreferenceChangeEvent（JDK11）

167 阅读 0 评论 0 点赞

java.lang.Object
- java.util.EventObject
- - java.util.prefs.PreferenceChangeEvent

All Implemented Interfaces:

Serializable
```
public class PreferenceChangeEvent
extends EventObject
```
An event emitted by a Preferences node to indicate that a preference has been added, removed or has had its value changed.
Note, that although PreferenceChangeEvent inherits Serializable interface from EventObject, it is not intended to be Serializable. Appropriate serialization methods are implemented to throw NotSerializableException.

Since:

1.4

See Also:

Preferences, PreferenceChangeListener, NodeChangeEvent

Field Summary
- Fields declared in class java.util.EventObject
  source

Constructor Summary

Constructors
Constructor	Description
`PreferenceChangeEvent(Preferences node, String key, String newValue)`	Constructs a new `PreferenceChangeEvent` instance.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`String`	`getKey()`	Returns the key of the preference that was changed.
`String`	`getNewValue()`	Returns the new value for the preference.
`Preferences`	`getNode()`	Returns the preference node that emitted the event.

Methods declared in class java.util.EventObject
getSource, toString

Methods declared in class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - PreferenceChangeEvent
```
public PreferenceChangeEvent(Preferences node,
                             String key,
                             String newValue)
```
    Constructs a new PreferenceChangeEvent instance.
    
    Parameters:
    
    node - The Preferences node that emitted the event.
    
    key - The key of the preference that was changed.
    
    newValue - The new value of the preference, or null if the preference is being removed.
- Method Detail
  - getNode
```
public Preferences getNode()
```
    Returns the preference node that emitted the event.
    
    Returns:
    
    The preference node that emitted the event.
  - getKey
```
public String getKey()
```
    Returns the key of the preference that was changed.
    
    Returns:
    
    The key of the preference that was changed.
  - getNewValue
```
public String getNewValue()
```
    Returns the new value for the preference.
    
    Returns:
    
    The new value for the preference, or null if the preference was removed.

微信小程序

微信扫一扫体验

微信公众账号

微信扫一扫加关注

发表
评论返回
顶部