Exception in thread "main" java.lang.ClassCastException: java.base/java.util.HashMap$Values cannot be cast to java.base/java.util.ArrayList 处理(待解决)

        Collection<Integer> c = new ArrayList<>();
        ArrayList<Integer>  list = (ArrayList<Integer>) c;
//       ===========================================================
        Collection<Integer> values = new HashMap<Integer,Integer> ().values();
        ArrayList<Integer> list1 =(ArrayList<Integer>) values;

　　 输出:Exception in thread "main" java.lang.ClassCastException: java.base/java.util.HashMap$Values cannot be cast to java.base/java.util.ArrayList