Converting HashMap to ArrayList

collections, generics, java

Solution

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.

Problem

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 ```

Original source