Demonstration of some static nested classes : Anonymous inner class « Class Definition « Java Tutorial






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  3. Anonymous inner class
/*
 *     file: DoubleNestedClassDemo.java
 *  package: oreilly.hcj.nested
 *
 * This software is granted under the terms of the Common Public License,
 * CPL, which may be found at the following URL:
 * http://www-124.ibm.com/developerworks/oss/CPLv1.0.htm
 *
 * Copyright(c) 2003-2005 by the authors indicated in the @author tags.
 * All Rights are Reserved by the various authors.
 *
########## DO NOT EDIT ABOVE THIS LINE ########## */
/*
 *     file: DoubleNestedClass.java
 *  package: oreilly.hcj.nested
 *
 * This software is granted under the terms of the Common Public License,
 * CPL, which may be found at the following URL:
 * http://www-124.ibm.com/developerworks/oss/CPLv1.0.htm
 *
 * Copyright(c) 2003-2005 by the authors indicated in the @author tags.
 * All Rights are Reserved by the various authors.
 *
########## DO NOT EDIT ABOVE THIS LINE ########## */


/**  
 * Demonstration of some static nested classes.
 *
 * @author <a href=mailto:kraythe@arcor.de>Robert Simmons jr. (kraythe)</a>
 * @version $Revision: 1.3 $
 */
 class DoubleNestedClass {
  /** Holds the name. */
  private static final String name = "Robert";

  /** Holds the company. */
  private static String company = "O'Reilly";

  /** Holds a value. */
  private int value = 5;

  /** 
   * Getter for the property company.
   *
   * @return The current company.
   */
  public static String getCompany() {
    return company;
  }

  /** 
   * Getter for the variable name.
   *
   * @return The current name.
   */
  public static String getName() {
    return name;
  }

  /** 
   * Getter for the variable company.
   *
   * @return the current company.
   */
  public int getValue() {
    return value;
  }

  /**  
   * A demo nested static class.
   *
   * @author <a href=mailto:kraythe@arcor.de>Robert Simmons jr. (kraythe)</a>
   * @version $Revision: 1.3 $
   */
  public static class SomeClass {
    /** Name of the book. */
    private static final String book = "Hardcore Java";

    /** 
     * a demo method.
     */
    public void someMethod() {
      System.out.println("In SomeClass.someMethod()");
      System.out.println(company);
      System.out.println(name);
      // System.out.println(value); // <= Compiler error
    }

    /**  
     * A demo nested static class.
     *
     * @author <a href=mailto:kraythe@arcor.de>Robert Simmons jr. (kraythe)</a>
     * @version $Revision: 1.3 $
     */
    public static class SomeOtherClass {
      /** 
       * a demo method.
       */
      public void someMethod() {
        System.out.println("In SomeOtherClass.someMethod()");
        System.out.println(company);
        System.out.println(book);
      }
    }
  }
}

/* ########## End of File ########## */


/**  
 * Demonstrates Static nested Classes.
 *
 * @author <a href=mailto:kraythe@arcor.de>Robert Simmons jr. (kraythe)</a>
 * @version $Revision: 1.3 $
 */
public class DoubleNestedClassDemo {
  /** 
   * Main method.
   *
   * @param args Command line arguments.
   */
  public static void main(final String[] args) {
    DoubleNestedClass.SomeClass.SomeOtherClass obj =
      new DoubleNestedClass.SomeClass.SomeOtherClass();
    obj.someMethod();
  }
}

/* ########## End of File ########## */








5.15.Anonymous inner class
5.15.1.Demonstrate an inner class.
5.15.2.Define an inner class within a for loop.
5.15.3.Use anonymous inner classes
5.15.4.Building the anonymous inner class in-place
5.15.5.Anonymous inner class cannot have a named constructor, only an instance initializer
5.15.6.Creating a constructor for an anonymous inner class
5.15.7.Using 'instance initialization' to perform construction on an anonymous inner class
5.15.8.Argument must be final to use inside anonymous inner class
5.15.9.A method that returns an anonymous inner class
5.15.10.An anonymous inner class that calls the base-class constructor
5.15.11.An anonymous inner class that performs initialization
5.15.12.Demonstrates method-scoped inner classes
5.15.13.Demonstrates anonymous classes
5.15.14.Demonstration of some static nested classes
5.15.15.Access inner class from outside
5.15.16.Accessing its enclosing instance from an inner class