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Nov 28th, 2014
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  1. class ClassA {
  2. String whoAmI() {
  3. return "ClassA";
  4. }
  5. }
  6.  
  7. class ClassB extends ClassA{
  8. String whoAmI() {
  9. return "ClassB";
  10. }
  11. }
  12.  
  13. class Main {
  14.  
  15. public static void main(String[] args) {
  16.  
  17. ClassA obj1 = new ClassA();
  18. ClassA obj2 = new ClassB();
  19.  
  20. System.out.println(obj1.whoAmI());
  21. System.out.println(obj2.whoAmI());
  22. }
  23. }
  24.  
  25. ClassA
  26. ClassB
  27.  
  28. class ClassA {
  29.  
  30. String whoAmI() {
  31. return "ClassA";
  32. }
  33. }
  34.  
  35. class Main {
  36.  
  37. public static void main(String[] args) {
  38.  
  39. Object obj1 = new ClassA();
  40. obj1.whoAmI();
  41. }
  42. }
  43.  
  44. Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - Erroneous sym type: java.lang.Object.whoAmI
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