ITEC 120 2012fall dbraffitt ibarland

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lect13a
Objects containing Objects

class files before lecture and class files after lecture.

Recall Robot API:
  Methods:  currentForm; willBattle; 
            add getter getIsEvil (but not getShape).
  Fields:  (ignore)





Robot Hideouts:

Data:
  address
  pres
  vp
  anthem

Tasks:
  coolestMember  
    Let's say that one robot 
    is cooler than another if ... the name of their xformed shape is shorter.]

  LESSON: A method should process one type of data -- 
          process nested data with helper functions.
          (As things get more and more complicated, it gets too
          hard to keep track of things.)
     Hideout methods should only work with Hideout fields/info --
     if there is code about Robots, make that a Robot method!




  Write boolean isInRevolt(), which determines
  whether any crew-*members* of this Hideout would attack any other crew-member.
  
Hint:
    A handy helper method would take any Robot r
    and any Robot[] crowd,
    and determine whether r would pick a fight with
    any member of crowd. 

    Once this is written, how can you use it to determine whether
    each crewmember might combat any other member of the crew?
  


  A method to modify the array:
  /** Swap this Hideout's president and a crewmember.
   * @param crewIndex The index of which crewmember to make president.
   *        It must be an integer in [0,this.crew.length).
   */
  void elect( /* Hideout this, */ int crewIndex ) { ... }

A 'Before' picture is drawn for you.
Draw the picture after calling elect(2).



  /** Swap this Hideout's president and the most popular crewmember.
   */
  void holdElection() { ... }









Consider: what classes, for contact info for employees?

public class Employee {
  private String name;
  private double salary;  // beware round-off if using double!

  // street, state, zip for home address
  // street, state, zip for mailing address
  // street, state, zip for work address
  // country code, area code, exchange, extension for work phone
  // country code, area code, exchange, extension for home phone
  // country code, area code, exchange, extension for cell phone

}

class ContactInfo {
  private String email
  private Address HomeAddr;
  private Address WorkAddr;
  private Address PermAddr;
  private PhoneNumber workNum;
  private PhoneNumber homeNum;
  private PhoneNumber cellNum;

  public String toString() { ... }
  public boolean equals( ContactInfo that ) { ... }
  public boolean livesAtPermanent() { ... }
}

class Address {
  private String street;
  private String apt;
  private String city;
  private String state;
  private String zip;
  private String country;

  public String toString() { ... }
  public boolean equals( Address that ) { ... }
  public boolean sameZip( Address that ) { ... }
}

class PhoneNumber {
  private String countryCode;
  private String areaCode;
  private String exchange;
  private String extension;

  public String toString() { ... }
  public boolean equals( PhoneNumber that ) { ... }
  public boolean sameExchange( PhoneNumber that ) { ... }
}

class files before lecture and class files after lecture.

home—info—lects—labs—exams—hws
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Object120 + its docs—java.lang docs—java.util docs

©2012, Ian Barland, Radford University Last modified 2012.Nov.26 (Mon)

Please mail any suggestions (incl. typos, broken links) to ibarlandradford.edu