Hierarchy 2 : Object Oriented Design « Language Basics « Java

1. Java
2. Language Basics
3. Object Oriented Design

Hierarchy 2

/*
 * Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
 * All rights reserved. Software written by Ian F. Darwin and others.
 * $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 * 
 * Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
 * cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
 * pioneering role in inventing and promulgating (and standardizing) the Java 
 * language and environment is gratefully acknowledged.
 * 
 * The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
 * inventing predecessor languages C and C++ is also gratefully acknowledged.
 */
public class Customer extends Person {
  private int customerNumber;

  public Customer(String firstName, String lastName, int number) {
    super(firstName, lastName);
    setCustomerNumber(number);
  }

  public void setCustomerNumber(int n) {
    if (n < 1)
      throw new IllegalArgumentException("Invalid customer number " + n);
    customerNumber = n;
  }
}
class Person {
  String firstName;
  String lastName;
  Person(String firstName, String lastName) {
    this.firstName = firstName;
    this.lastName = lastName;
  }
}
class Employee extends Person {
  private short deptCode;
  private int staffNumber;

  public Employee(String firstName, String lastName, short dept, int number) {
    super(firstName, lastName);
    setDeptCode(dept);
    setStaffID(number);
  }

  public void setDeptCode(short dept) {
    deptCode = dept;
  }

  public void setStaffID(int number) {
    if (number < 1)
      throw new IllegalArgumentException("Invalid staff number " +
        number);
    staffNumber = number;
  }
}


           
       

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