Bindings (Java Platform SE 6) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档

Overview

Package

Class

Use

Tree

Deprecated

Index

Help

Java™ Platform
Standard Ed. 6

PREV CLASS NEXT CLASS

FRAMES NO FRAMES

SUMMARY: NESTED | FIELD | CONSTR | METHOD

DETAIL: FIELD | CONSTR | METHOD

javax.script
Interface Bindings

All Superinterfaces:: Map<String,Object>

All Known Implementing Classes:: SimpleBindings

public interface Bindings
extends Map<String,Object>
extends Map<String,Object>

A mapping of key/value pairs, all of whose keys are Strings.

Since:: 1.6

Nested Class Summary

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Method Summary

boolean containsKey(Object key)
          Returns true if this map contains a mapping for the specified key.

Object get(Object key)
          Returns the value to which this map maps the specified key.

Object put(String name, Object value)
          Set a named value.

void putAll(Map<? extends String,? extends Object> toMerge)
          Adds all the mappings in a given Map to this Bindings.

Object remove(Object key)
          Removes the mapping for this key from this map if it is present (optional operation).

Methods inherited from interface java.util.Map

clear, containsValue, entrySet, equals, hashCode, isEmpty, keySet, size, values

Nested classes/interfaces inherited from interface java.util.Map
`Map.Entry<K,V>`

Method Summary
`boolean`	`containsKey(Object key)` Returns `true` if this map contains a mapping for the specified key.
`Object`	`get(Object key)` Returns the value to which this map maps the specified key.
`Object`	`put(String name, Object value)` Set a named value.
`void`	`putAll(Map<? extends String,? extends Object> toMerge)` Adds all the mappings in a given `Map` to this `Bindings`.
`Object`	`remove(Object key)` Removes the mapping for this key from this map if it is present (optional operation).

Methods inherited from interface java.util.Map
`clear, containsValue, entrySet, equals, hashCode, isEmpty, keySet, size, values`

Method Detail

put

Object put(String name,
           Object value)

Set a named value.

Specified by:: put in interface Map<String,Object>

Parameters:: name - The name associated with the value.; value - The value associated with the name.
Returns:: The value previously associated with the given name. Returns null if no value was previously associated with the name.
Throws:: NullPointerException - if the name is null.; IllegalArgumentException - if the name is empty String.

putAll

void putAll(Map<? extends String,? extends Object> toMerge)

Adds all the mappings in a given Map to this Bindings.

Specified by:: putAll in interface Map<String,Object>

Parameters:: toMerge - The Map to merge with this one.
Throws:: NullPointerException - if toMerge map is null or if some key in the map is null.; IllegalArgumentException - if some key in the map is an empty String.

containsKey

boolean containsKey(Object key)

Returns true if this map contains a mapping for the specified key. More formally, returns true if and only if this map contains a mapping for a key k such that (key==null ? k==null : key.equals(k)). (There can be at most one such mapping.)

Specified by:: containsKey in interface Map<String,Object>

Parameters:: key - key whose presence in this map is to be tested.
Returns:: true if this map contains a mapping for the specified key.
Throws:: NullPointerException - if key is null; ClassCastException - if key is not String; IllegalArgumentException - if key is empty String

get

Object get(Object key)

Returns the value to which this map maps the specified key. Returns null if the map contains no mapping for this key. A return value of null does not necessarily indicate that the map contains no mapping for the key; it's also possible that the map explicitly maps the key to null. The containsKey operation may be used to distinguish these two cases.

More formally, if this map contains a mapping from a key k to a value v such that (key==null ? k==null : key.equals(k)), then this method returns v; otherwise it returns null. (There can be at most one such mapping.)

Specified by:: get in interface Map<String,Object>

Parameters:: key - key whose associated value is to be returned.
Returns:: the value to which this map maps the specified key, or null if the map contains no mapping for this key.
Throws:: NullPointerException - if key is null; ClassCastException - if key is not String; IllegalArgumentException - if key is empty String

remove

Object remove(Object key)

Removes the mapping for this key from this map if it is present (optional operation). More formally, if this map contains a mapping from key k to value v such that (key==null ? k==null : key.equals(k)), that mapping is removed. (The map can contain at most one such mapping.)

Returns the value to which the map previously associated the key, or null if the map contained no mapping for this key. (A null return can also indicate that the map previously associated null with the specified key if the implementation supports null values.) The map will not contain a mapping for the specified key once the call returns.

Specified by:: remove in interface Map<String,Object>

Parameters:: key - key whose mapping is to be removed from the map.
Returns:: previous value associated with specified key, or null if there was no mapping for key.
Throws:: NullPointerException - if key is null; ClassCastException - if key is not String; IllegalArgumentException - if key is empty String