Path: csiph.com!aioe.org!.POSTED!not-for-mail
From: omegajunior <omegajunior@protonmail.com>
Newsgroups: comp.lang.java.programmer
Subject: Re:hash map
Date: Sun, 16 Apr 2017 17:11:07 -0400 (EDT)
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pablo <pa24959122@gmail.com> Wrote in message:
> hi all i am trying to add to a hash map but i cant seem to do it could somebody look at the code and tell me why the hell i cant add the key and value 
> 
> 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,Customer> Customer = new HashMap<String, Customer>();
>    
> 
>    public Garage() 
>    {
>      Customer = new HashMap<>(); 
>    }
>    
>    public void addCustomer(String Customer)
>    {"
>       Customer.Put(Andrew Smith, address 1 The High Street", area 1, "123ABC");
> }  
> 

1. You seem to have got your structures wrong. What you're adding
 to the Customer map is <Name, Address>, but instead of Address
 you've defined Customer to contain Customer. If that doesn't
 confuse you, I applaud your mental prowess. 
  
2. Your code doesn't put a String and an Address into the map.
 That's because your code doesn't wrap the customer's name in
 quotes. Leaving out the quotes makes Java interpret the name as a
 Java language keyword or a class or variabla name, which probably
 isn't your intent. 
  
3. Your code uses a Map#Put method. The Map class doesn't have a
 method named Put. It's named put. Note the lower-cased
 p.
  
Combining that, this should work: 
  
final class mine {

private final map<String, String> customers = new HashMap<>(); 

public final void add() {
  this.customers.put("Andrew Smith", "1 The High Street, area 1,
 123ABC");
}

}

If you want the customers map to hold an Address type rather than
 a String containing address data, you'll have to define an
 Address class, first.
  
Does that help?
-- 
We make software better.


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