oracle java tutorial walkthrough -- Nested Classes4 code

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oracle java tutorial walkthrough -- Nested Classes4  code

package nestedclasses.session0;

/*
 * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle or the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

public class LocalClassExample {

    private static String regularExpression = "[^0-9]";

    interface HelloThere {
        // public void greet();
    }

    static public void validatePhoneNumber(

    String phoneNumber1, String phoneNumber2) {

        int numberLength = 10;

        // Valid in JDK 8 and later:

        // int numberLength = 10;

        abstract class PhoneNumber2 implements HelloThere {

            final static int a = 10;

            String regularExpression = "[^0-9-]";

            String formattedPhoneNumber = null;

            PhoneNumber2(String phoneNumber) {
                // numberLength = 7;
                String currentNumber = phoneNumber.replaceAll(
                        LocalClassExample.this.regularExpression, "");
                if (currentNumber.length() == numberLength)
                    formattedPhoneNumber = currentNumber;
                else
                    formattedPhoneNumber = null;
            }

            public String getNumber() {
                return formattedPhoneNumber;
            }

            // Valid in JDK 8 and later:

            public void printOriginalNumbers() {
                System.out.println("Original numbers are " + phoneNumber1
                        + " and " + phoneNumber2);
            }
        }

        class PhoneNumber extends PhoneNumber2 {
            PhoneNumber(String phoneNumber) {
                super(phoneNumber);
            }
        }

        PhoneNumber myNumber1 = new PhoneNumber(phoneNumber1);
        PhoneNumber myNumber2 = new PhoneNumber(phoneNumber2);
        myNumber1.printOriginalNumbers();

        // Valid in JDK 8 and later:

        // myNumber1.printOriginalNumbers();

        if (myNumber1.getNumber() == null)
            System.out.println("First number is invalid");
        else
            System.out.println("First number is " + myNumber1.getNumber());
        if (myNumber2.getNumber() == null)
            System.out.println("Second number is invalid");
        else
            System.out.println("Second number is " + myNumber2.getNumber());

    }

    public void sayGoodbyeInEnglish() {
        class EnglishGoodbye {
            public static final String farwell = "bye bye bye";

            public void sayGoodbye() {
                System.out.println(farwell);
            }
        }
        new EnglishGoodbye().sayGoodbye();
    }

    public static void main(String... args) {
        LocalClassExample l = new LocalClassExample();
        l.validatePhoneNumber("123-456-7890", "456-7890");
        l.sayGoodbyeInEnglish();
    }
}