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Groups > comp.lang.java.programmer > #36468

Re: hash map

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On Monday, 17 April 2017 15:15:18 UTC+1, Eric Sosman  wrote:
> On 4/17/2017 9:53 AM, pablo wrote:
> > 
> > import java.util.*;
> > /**
> >   * The class Garage is used to hold data about a collection of customers.
> >   *
> >   * @author M250 module team
> >   * @version 1.0
> >   */
> > public class Garage
> > {
> >     //garage creating an empty instance of map map
> >     private  Map<String,String> map = new HashMap<String, String>();
> 
>      Okay: This says that each "Garage" instance owns a Map whose
> keys are Strings and whose corresponding values are also Strings,
> and it arranges to create such a Map (empty) each time you create
> a Garage.  Fine so far.
> 
> >     map.put("Andrew Smith, address 1 The High Street, area 1");
> 
>      ... but this is, er, "less fine."  For one thing, it's not a
> declaration but an executable statement, a call upon the Map's put()
> method.  Executable statements can't just float around in the ether,
> but must be inside methods or constructors (or static blocks, but
> they are less common).
> 
>      After you've solved that problem by finding a suitable home for
> the executable statement, you'll discover another one: Map's put()
> method requires two arguments, the key and corresponding value of a
> key/value pair.  The method call you have written provides only one
> argument, not the required two.  Perhaps you meant something like
> 
> 	map.put("Andrew Smith", "1 The High Street, area 1");
> 
> ... which associates the key "Andrew Smith" with the value "1 The
> High Street, area 1".  That's just a guess, though, because we don't
> know what relationship this map is intended to represent.
> 
> > 
> >     
> > }
> > 
> 
> 
> -- 
> esosman@comcast-dot-net.invalid
> Thirteen hundred seventy-four days to go.

hi Eric just to put a little bit of context to this this is what i have been asked to do obviously i am struggling 

 An instance of Garage is used to hold data about a collection of customers. Declare a private instance variable called customers in your Garage class, capable of referencing a map where the keys are strings and the values are Customer objects as below (the order of keys in the map is unimportant):
Key       Value
 "123ABC" Customer object with name "Andrew Smith", address "1 The High Street", area 1
 "456DEF" Customer object with name "Janet Jones", address "145 Main Street", area 1 
"789GHI" Customer object with name "Christine Charter", address "50 Lake View", area 2

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hash map pablo <pa24959122@gmail.com> - 2017-04-16 11:53 -0700
  Re: hash map Martin Gregorie <martin@address-in-sig.invalid> - 2017-04-16 19:10 +0000
  Re:hash map omegajunior <omegajunior@protonmail.com> - 2017-04-16 17:11 -0400
    Re: hash map pablo <pa24959122@gmail.com> - 2017-04-17 04:31 -0700
  Re: hash map Eric Douglas <e.d.programmer@gmail.com> - 2017-04-17 05:11 -0700
    Re: hash map pablo <pa24959122@gmail.com> - 2017-04-17 05:32 -0700
      Re: hash map Eric Douglas <e.d.programmer@gmail.com> - 2017-04-17 05:58 -0700
      Re: hash map Eric Sosman <esosman@comcast-dot-net.invalid> - 2017-04-17 09:10 -0400
        Re: hash map pablo <pa24959122@gmail.com> - 2017-04-17 06:53 -0700
          Re: hash map Eric Sosman <esosman@comcast-dot-net.invalid> - 2017-04-17 10:15 -0400
            Re: hash map pablo <pa24959122@gmail.com> - 2017-04-17 07:25 -0700
              Re: hash map Eric Douglas <e.d.programmer@gmail.com> - 2017-04-17 07:46 -0700
              Re: hash map Eric Sosman <esosman@comcast-dot-net.invalid> - 2017-04-17 10:54 -0400
                Re: hash map pablo <pa24959122@gmail.com> - 2017-04-17 08:29 -0700
                Re: hash map Eric Douglas <e.d.programmer@gmail.com> - 2017-04-17 08:44 -0700
                Re: hash map Eric Sosman <esosman@comcast-dot-net.invalid> - 2017-04-17 12:07 -0400
                Re: hash map pablo <pa24959122@gmail.com> - 2017-04-17 09:32 -0700
                Re: hash map Martin Gregorie <martin@address-in-sig.invalid> - 2017-04-17 23:14 +0000
                Re: hash map Arne Vajhøj <arne@vajhoej.dk> - 2017-04-17 20:22 -0400
                Re: hash map Martin Gregorie <martin@address-in-sig.invalid> - 2017-04-18 01:20 +0000
                Re: hash map Arne Vajhøj <arne@vajhoej.dk> - 2017-04-18 20:01 -0400
                Re: hash map Martin Gregorie <martin@address-in-sig.invalid> - 2017-04-19 09:02 +0000
                Re: hash map Eric Douglas <e.d.programmer@gmail.com> - 2017-04-18 04:54 -0700
                Re: hash map Arne Vajhøj <arne@vajhoej.dk> - 2017-04-18 20:03 -0400
                Re: hash map Martin Gregorie <martin@address-in-sig.invalid> - 2017-04-19 08:55 +0000
                Re: hash map Eric Douglas <e.d.programmer@gmail.com> - 2017-04-19 04:45 -0700
                Re: hash map Arne Vajhøj <arne@vajhoej.dk> - 2017-04-18 20:05 -0400

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