2D in Java

[nanhiPari]

hello..

making a Project..n want to ask the Guru's of Java..

can java provide me a method so that i can store multiple phone no's in one variable n this phone nos corresponds to a Address..

well what i thought was a 2D Array for this..but when i made it, the data was not stored in the variable coz i have not given the SIze(coz it can Varry) of the Array..

Any solution...??

Thanz in Advance

Cheerz!!

[JosAH]

hello..

making a Project..n want to ask the Guru's of Java..

can java provide me a method so that i can store multiple phone no's in one variable n this phone nos corresponds to a Address..

well what i thought was a 2D Array for this..but when i made it, the data was not stored in the variable coz i have not given the SIze(coz it can Varry) of the Array..

Any solution...??

Thanz in Advance

Cheerz!!

Basically an Address can have zero or more PhoneNumbers? Why not just do this:

public class PhoneNumber {
   // all the obligatory methods in here
}
//
public class Address {
   private Set<PhoneNumber> phones= new HashSet<PhoneNumber>();
   // ...
   public boolean addPhoneNumber(PhoneNumber pn) {
      return phones.add(pn);
   }
   public boolean hasPhoneNumber(PhoneNumber pn) {
      return phones.contains(pn);
   }
   // etc.
}
 

kind regards,

Jos

[nanhiPari]

Basically an Address can have zero or more PhoneNumbers? Why not just do this:

public class PhoneNumber {
   // all the obligatory methods in here
}
//
public class Address {
   private Set<PhoneNumber> phones= new HashSet<PhoneNumber>();
   // ...
   public boolean addPhoneNumber(PhoneNumber pn) {
      return phones.add(pn);
   }
   public boolean hasPhoneNumber(PhoneNumber pn) {
      return phones.contains(pn);
   }
   // etc.
}
 

kind regards,

Jos

Thankz for the suggestion Jos..but where i m doing this Project(my college..) it has java 1.4 n Generic is not Supported on that version..

well any other way to do this Thing..??

Thankz

Cheerz!!

[JosAH]

Thankz for the suggestion Jos..but where i m doing this Project(my college..) it has java 1.4 n Generic is not Supported on that version..

well any other way to do this Thing..??

Thankz

Cheerz!!

Sure, do it the old-fashioned way with Lists and casts and all. There's no real
difference except for the verbosity in your code, i.e. the general idea doesn't change.

kind regards,

Jos

[r035198x]

.. and don't forget there is a full page on HashSet in the Java API specs.

[nanhiPari]

Sure, do it the old-fashioned way with Lists and casts and all. There's no real
difference except for the verbosity in your code, i.e. the general idea doesn't change.

kind regards,

Jos

.. and don't forget there is a full page on HashSet in the Java API specs.

Thanz for the info..

thanz Jos..will try it that way..n see..whether it works or not in my case...

cheerz!!

[JosAH]

Thanz for the info..

thanz Jos..will try it that way..n see..whether it works or not in my case...

cheerz!!

Of course it will: suppose you have 'T' type of elements in your list; the Java 1.5
way would be something like this (using the new for loop):

for (T t: list)
   // do something with that 't'
 

In 'old' Java 1.4 you'd have to do this:

for (int i= 0, n= list.size(); i < n; i++) {
   T t= (T)list.get(i);
   // do something with that 't'
}
 

kind regards,

Jos