Get nth element of a Map

**Gunner 1** · 10-02-2010

Hello,
Here is my map

Code:

 Map <String, Map <String,Integer>> fl2 = new HashMap <String, Map <String,Integer>>();

I would like for example after finding the first branch, to enumerate all the items related to this sector as a String. I've wanted to do some work by retrieving the size of the map, but after it no longer works with get. Here is my code

Code:

  else if (fl2.containsKey (dp) & &! fl2.get (dp). containsKey (ar))
    (
        / / one of them to start
        this.tf_answer.setText ( "this flight is not direct");
        int msz = fl2.get (dp). size ();
        for (int i = 0; i <msz; i + +)
        (
            System.out.println ( "fl2.get (dp). Get (i). ToS:" + fl2.get (dp). get (i). toString ());
        }

But it does not work, I can 't find the method. Basically i want to find the nth element of the Map. Any help in this.

**GlassFish** · 10-02-2010

Hello,
Elements of a Map did not order, then the "nth element that has no meaning.
By cons you can iterate over the contents of the Map. Here is the code you can refer to.

Code:

for (Integer item: fl2.get(dp).values()) {
  / / Do something with item qq
}

If you need any help in this then please do post back.

**Gunner 1** · 10-02-2010

Hello,
Your last technique allows me to juggle it does element by element? I will have then needed to test all the elements he presents are all the same to this this. I will try it in my code , I have any idea for it that is how to use it in the code. Until then, if you have any alternative method for doing the same task then please do post back with that, I am interested to work on it.

**Miles Runner** · 10-02-2010

Hello,
I am trying the same kind of a code, but this does not work, even the getItem returns null. Here is my code, please verify it.

Code:

for (int Item: fl2.get(dp).values()) {
System.out.System.out.println("Test"+ fl2.get(dp).get(Item) );
System.out.System.out.println("Key"+ Item ); / / IT WORKS j have a key
System.out.System.out.println("Key values"+ fl2.get(ar).get(Item).function toString() {
    [native code]
}() ); / / But in fact the same getItem returns null
        }

Any help on this is highly appreciated. Thanks in advance.

**NetWorkInG** · 10-02-2010

Hello,
In Your Map, item is a value (see. Values ()), no key. If you want to iterate over the keys, what i am trying to say is this

Code:

for (String key: fl2.get(dp).keySet()) {
  System.out.System.out.println(key);
  System.out.System.out.println(fl2.get(dp).get(key));
}

Just try this code in your program and then see if your problem is sorted. if not then you can post back with the error.

**Linux-Us** · 10-02-2010

Hello,
I am new to this concept but I have code with me, just have a look at it, it may help you. Here is the code

Code:

public class MainClass {
  public static void main(String[] a) {

    Map m = new HashMap();
    m.put("key1", "value1");
    m.put("key2", "value2");
    m.put("key3", "value3");
    Set set = m.entrySet();

    Iterator ir = set.irator();

    while (ir.hasNext()) {
      Map.Entry entry = (Map.Entry) ir.next();
      System.out.println(entry.getKey() + " -- " + entry.getValue());
    }
  }
}