nilenumeration.java

树形的java classloader,树形的java classloader,树形的java classloader,

package org.codehaus.classloader;

import java.util.Enumeration;
import java.util.NoSuchElementException;

/**
 * An implementation of Enumeration that is empty.
 * <p>
 * @author Ben Yu
 * Aug 1, 2006 5:06:27 PM
 */
public final class NilEnumeration implements Enumeration {
  public boolean hasMoreElements() {
    return false;
  }

  public Object nextElement() {
    throw new NoSuchElementException();
  }
  private NilEnumeration(){}
  private static NilEnumeration singleton = new NilEnumeration();
  /**
   * Get an instance of empty enumeration.
   */
  public static Enumeration instance(){
    return singleton;
  }
}