¥In
DrJava, open the file IntList.java. We want to convert IntList.java to a program List.java that implements heterogeneous
lists (lists that can hold arbitrary
objects, not just elements of a particular type). The
element type in the program List.java must be Object. Otherwise the code is unchanged.
¥Rewrite
the concat
and rev methods for heterogeneous
lists. Test your code on
some lists of Integer.