Inserting from ArrayList to HashMap

Question

as my question says I would like to insert my arraylist items into a hashmap.

This is my HashMap.

HashMap<String, Integer> unSorted = new HashMap<String, Integer>();

This is my ArrayList.

arrayList.add("1");

arrayList.add("2");

Adding into Hashmap.

unSorted.put(arrayList,50);

I am pretty sure I can't add an arraylist like this. I forgot I've got to iterate the arrayList and insert the values one by one.

How am I going wrong ?

Thank you for your time !

Haven't you got the answer yourself? :) "I forgot I've got to iterate the arrayList and insert the values one by one." — denis.solonenko
– denis.solonenko, Commented Nov 17, 2011 at 5:17
Hi denis...my problem is dealing with my key type in the hashmap. Can I add an arrayList directly HashMap<String, Integer> unSorted = new HashMap<String, Integer>(); — Vinoth
– Vinoth, Commented Nov 17, 2011 at 5:21
Yes, you have your answer in your posted question. Iterate through the arrayList. something like this: unSorted.put(arrayList.get(0),0) ... — HashimR
– HashimR, Commented Nov 17, 2011 at 5:22
@Vinoth you may add hole arraylist directly but you need to change data-type in HashMap. — Yagnesh Agola
– Yagnesh Agola, Commented Nov 17, 2011 at 5:28

KV Prajapati · Accepted Answer · 2011-11-17 05:20:52Z

5

Iterate the ArrayList.

for(String item:arrayList)
 {
  unSorted.put(item,50);
 }

answered Nov 17, 2011 at 5:20

KV Prajapati

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