HackerRank Java- Reflection - Attributes




JAVA reflection is a very powerful tool to inspect the attributes of a class in runtime. For example, we can retrieve the list of public fields of a class using getDeclaredMethods().

In this problem, you will be given a class Solution in the editor. You have to fill in the incompleted lines so that it prints all the methods of another class called Student in alphabetical order. We will append your code with the Student class before running it. The Student class looks like this:



  1. public class Solution {
  2. public static void main(String[] args) {
  3. Class student = Student.class; // uses class literal, not a function.
  4. Method[] methods = student.getDeclaredMethods();
  5. /* Get names from Methods */
  6. ArrayList<String> methodNames = new ArrayList();
  7. for (Method method : methods) {
  8. methodNames.add(method.getName());
  9. }
  10. /* Sort and print names */
  11. Collections.sort(methodNames);
  12. for (String name: methodNames) {
  13. System.out.println(name);
  14. }
  15. }
  16. }
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