how to get hashmap object value

Question

i have a code which put object as hashmap value. I want to read lat and lng from the hashmap using iterator class. But i dont know how to do this.here is my code.

Location locobj = new Location();
HashMap loc = new HashMap();

while(rs.next()){
      locobj.setLat(lat);
      locobj.setLng(lon);
      loc.put(location, locobj);

}

      Set set = loc.entrySet();
      Iterator i = set.iterator();
      while(i.hasNext()) {
      Map.Entry me = (Map.Entry)i.next();
      System.out.println(me.getKey()+"value>>"+me.getValue()); 
      }

class location is like this

public class Location {

    private String lat;
    private String lng;
    private String name;

    public String getLat() {
        return lat;
    }
    public void setLat(String lat) {
        this.lat = lat;
    }
    public String getLng() {
        return lng;
    }
    public void setLng(String lng) {
        this.lng = lng;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }

}

how do i read locobj lat and lng value from getValue() method.please help

System.out.println(me.getKey()+"value>>"+me.getValue()); here iwant to the lat and lng value by calling getLat() and getLng() method. how do i do that using me.getValue()... — ishk
– ishk, Commented Jan 1, 2013 at 13:42

Manish Mulani · Accepted Answer · 2013-01-01 13:53:55Z

5

You should make use of generics here. Declare Map as

Map<String, Location> locationMap = new HashMap<>() // assuming your key is of string type

That way, you can avoid typecasting (RTTI should be avoided - one of the design principles)

Location locobj = me.getValue()
locobj.getLat() // will give you latitude
locobj.getLng() // will give you longitude

answered Jan 1, 2013 at 13:53

Manish Mulani

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Comments

DataNucleus · Accepted Answer · 2013-01-01 13:40:28Z

4

Why not just cast the value?

Location locobj = (Location)me.getValue();
locobj.getLat();
locobj.getLng();

answered Jan 1, 2013 at 13:40

DataNucleus

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Comments

Steve Atkinson · Accepted Answer · 2013-01-01 13:58:07Z

1

Change your code to use Generics.

Instead of

Location locobj = new Location();
Map<Location> loc = new HashMap<Location>(); // code to interfaces, and use Generics

do

Location locobj = new Location();
HashMap<String,Location> loc = new HashMap<String,Location>();

and your entry as

Map.Entry<String,Location> me = (Map.Entry)i.next();

Then you won't have to cast anything

answered Jan 1, 2013 at 13:58

Steve Atkinson

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Comments

Nikolay Kuznetsov · Accepted Answer · 2013-01-01 13:50:19Z

0

getValue() returns you reference to Object, but in fact object is Location. So you need to perform casting, see answer from @DataNucleus, but you can do even like this:

System.out.println(me.getKey()+"value>>"+((Location)me.getValue()).getLng());

answered Jan 1, 2013 at 13:50

Nikolay Kuznetsov

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Comments

Kiran Mohan · Accepted Answer · 2013-01-01 14:00:17Z

0

You are retrieving an Object with getKey() or getValue(). You need to now call the getter methods to print the appropriate values.

edited Jan 1, 2013 at 14:00

answered Jan 1, 2013 at 13:51

Kiran Mohan

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Comments

AJPerez · Accepted Answer · 2014-12-01 08:19:01Z

0

The following can be used:

for (Entry entry : map.entrySet()) {
    String key = entry.getKey();
    Object values = (Object) entry.getValue();
    System.out.println("Key = " + key);
    System.out.println("Values = " + values + "n");
}

edited Dec 1, 2014 at 8:19

AJPerez

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answered Dec 1, 2014 at 7:39

user3640657

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