Get the package name of the specified class. : Package « Reflection « Java Tutorial

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Java Tutorial » Reflection » Package 




import java.lang.reflect.Method;
import java.net.URL;
import java.security.CodeSource;
import java.security.ProtectionDomain;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

/*
 * JBoss, Home of Professional Open Source
 * Copyright 2005, JBoss Inc., and individual contributors as indicated
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

public class Main {

  /** The string used to separator packages */
  public static final String PACKAGE_SEPARATOR = ".";

  /**
   * Get the package name of the specified class.
   
   @param classname
   *          Class name.
   @return Package name or "" if the classname is in the <i>default</i>
   *         package.
   
   @throws EmptyStringException
   *           Classname is an empty string.
   */
  public static String getPackageName(final String classname) {
    if (classname.length() == 0)
      System.out.println("Empty String Exception");

    int index = classname.lastIndexOf(PACKAGE_SEPARATOR);
    if (index != -1)
      return classname.substring(0, index);
    return "";
  }
}














7.6.Package
7.6.1.Demonstrate Package
7.6.2.Get full package name
7.6.3.Get package name of a class
7.6.4.getPackage() returns null for a class in the unnamed package
7.6.5.getPackage() returns null for a primitive type or array
7.6.6.Find the Package of an Object
7.6.7.Get the class name with or without the package
7.6.8.Detect if a package is available
7.6.9.Get the package name of the specified class.
7.6.10.Get the short name of the specified class by striping off the package name.
7.6.11.Get Package Names From Dir
7.6.12.Get non Package Qualified Name
7.6.13.Returns the package portion of the specified class
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