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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. public static void main (String[] args)
  11. {
  12. Map<String, List<String>> m = (Map)getMap();
  13. try {
  14. System.out.println(m.get("entry").get(0)); // Fails here
  15. }
  16. catch (Exception e) {
  17. System.out.println("Failed: " + e.getMessage());
  18. e.printStackTrace(System.out);
  19. }
  20. }
  21. static Object getMap() {
  22. Map m = new HashMap();
  23. List l = new LinkedList();
  24. l.add(42);
  25. m.put("entry", l);
  26. return m;
  27. }
  28. }
Success #stdin #stdout 0.06s 380160KB
stdin
Standard input is empty
stdout
Failed: java.lang.Integer cannot be cast to java.lang.String
java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String
	at Ideone.main(Main.java:14)