Java: Sorting Alphanumeric List

Sorting Alphanumeric List in Using Comparator Interface

public class AlphaNumericComparators<T> implements Comparator<T> {

    @Override
    public int compare(T o1, T o2) {
String obj1 = null;
String obj2 = null;
try {
   if (null == o1 || null == o2) {
return 1;
   }

   obj1 = (String) o1;
   obj2 = (String) o2;
   BigDecimal val1 = new BigDecimal(obj1);
   BigDecimal val2 = new BigDecimal(obj2);
   return val1.compareTo(val2);
} catch (Exception e) {
   return obj1.compareTo(obj2);
}
    }
}


public class Test {
    public static void main(String[] args) {

List<Object> list = new ArrayList<Object>();
list.add("50000");
list.add("xxxa");
list.add("10");
list.add("12");
list.add("Abvs");
list.add("6");
list.add("sdsdsd");
list.add("-1");
list.add(null);
System.out.println("Before Sorting");
System.out.println(list);
Collections.sort(list, new AlphaNumericComparators<Object>());
System.out.println("After Sorting");
System.out.println(list);
    }
}

Output
Before Sorting
[50000, xxxa, 10, 12, Abvs, 6, sdsdsd, -1, null]
After Sorting
[-1, 6, 10, 12, 50000, Abvs, sdsdsd, xxxa, null]