Converting HashMap to ArrayList

Question

I just want to move the transitionHash map values into the cardholderDataRecords arraylist.

HashMap<String,ExceptionLifeCycleDataBean> transitionHash = new HashMap<String,ExceptionLifeCycleDataBean>();

ArrayList<ExceptionLifeCycleDataBean> cardholderDataRecords = new ArrayList<ExceptionLifeCycleDataBean>();

i am doing as

cardholderDataRecords.add((ExceptionLifeCycleDataBean) transitionHash.values());

It's throwing

java.lang.ClassCastException: java.util.HashMap$Values cannot be cast to com.reportss.bean.ExceptionLifeCycleDataBean

Jon Skeet · Accepted Answer · 2012-05-28 06:19:53Z

130

You're trying to cast the collection of values to a single ExceptionLifeCycleDataBean.

You can very easily get the list though:

List<ExceptionLifeCycleDataBean> beans =
    new ArrayList<ExceptionLifeCycleDataBean>(transitionHash.values());

Or to add to an existing collection, with:

cardholderDataRecords.addAll(transitionHash.values());

No casts necessary.

answered May 28, 2012 at 6:19

Jon Skeet

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2 Comments

user2396640 Over a year ago

I successfully converted from HashMap to ArrayList using addAll. But i can't loop the new arraylist using : for (ExceptionLifeCycleDataBean bean : cardholderDataRecords) can it be done ?

Jon Skeet Over a year ago

@user2396640 I have no idea what you mean by that. Maybe you should ask a new question with details.

abhishek ringsia · Accepted Answer · 2017-05-09 06:17:05Z

-3

Converting Data HashSet to Array List

ArrayList<ExceptionLifeCycleDataBean> cardholderDataRecords = new ArrayList<ExceptionLifeCycleDataBean>(transitionHash);

Same Way, You can convert ArrayList to Hashmap.

answered May 9, 2017 at 6:17

abhishek ringsia

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