[/url] [url=file:///F:/资料/文字资料/j2sdk-1_4_2-doc/docs/api/overview-summary.html]Overview
Class
JavaTM 2 Platform
Std. Ed. v1.4.2
SUMMARY: NESTED | FIELD | CONSTR | METHOD
DETAIL: FIELD | CONSTR | METHOD
java.util
Interface EnumerationAll Known Subinterfaces: NamingEnumeration All Known Implementing Classes: StringTokenizer public interface EnumerationAn object that implements the Enumeration interface generates a series of elements, one at a time. Successive calls to the nextElement method return successive elements of the series. 实现Enumeration接口的对象生成元素序列。持续调用nextElement方法可以持续返回序列中的元素。
For example, to print all elements of a vector v: 例如，打印vector v中的所有元素：
for (Enumeration e = v.elements() ; e.hasMoreElements() ;) {
System.out.println(e.nextElement());
}
Methods are provided to enumerate through the elements of a vector, the keys of a hashtable, and the values in a hashtable. Enumerations are also used to specify the input streams to a SequenceInputStream. 提供了通过vector元素、hash表关键字和hash表关键值枚举元素的方法。 Enumeration也可用来指定输入流为SequenceInputStream。
NOTE: The functionality of this interface is duplicated by the Iterator interface. In addition, Iterator adds an optional remove operation, and has shorter method names. New implementations should consider using Iterator in preference to Enumeration. 注意：该接口和Iterator接口功能上重复。Iterator增加了可选的删除操作，方法名更短。 新的实现应当优先考虑Iterator而不是Enumeration。
Since: JDK1.0 See Also: Iterator, SequenceInputStream, nextElement(), Hashtable, Hashtable.elements(), Hashtable.keys(), Vector, Vector.elements()Method Summary
boolean
Tests if this enumeration contains more elements. 测试枚举器中是否还含有元素。
Returns the next element of this enumeration if this enumeration object has at least one more element to provide. 如果枚举器对象中至少还有一个元素可提供时，返回枚举器的下一个元素。
Method Detail
hasMoreElementspublic boolean hasMoreElements()
Tests if this enumeration contains more elements. 测试枚举器中是否还含有元素。
Returns: true if and only if this enumeration object contains at least one more element to provide; false otherwise. 如果枚举器对象中至少还有一个元素可提供时，返回true，否则为false。nextElementpublic Object nextElement()
Returns the next element of this enumeration if this enumeration object has at least one more element to provide. 如果枚举器对象中至少还有一个元素可提供时，返回枚举器的下一个元素。
Returns: the next element of this enumeration. 枚举器的下一个元素。 Throws: NoSuchElementException - if no more elements exist. 如果没有元素存在时抛出。[/url][url=file:///F:/资料/文字资料/j2sdk-1_4_2-doc/docs/api/overview-summary.html]Overview
Class
JavaTM 2 Platform
Std. Ed. v1.4.2
SUMMARY: NESTED | FIELD | CONSTR | METHOD
DETAIL: FIELD | CONSTR | METHOD
For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples. Copyright 2003 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.
