Java: Set Intersection

/*
Please implement this method to
return a Set equal to the intersection of the parameter Sets
The method should not chage the content of the parameters.
*/

1. import java.util.HashSet;


2. import java.util.Iterator;


3. import java.util.NoSuchElementException;


4. import java.util.Set;




6. public class SetIntersection {


7. /**


8. * @param args


9. */




11. private static Set<Object> s1;


12. private static Set<Object> s2;


13. public static Set<Object> getIntersection(Set<Object> a, Set<Object> b) {


14. /*


15. Please implement this method to


16. return a Set equal to the intersection of the parameter Sets


17. The method should not chage the content of the parameters.


18. */




20. s1 =a;


21. s2 = b;


22. Object ob;


23. Set<Object> s3 = new HashSet<Object>();






26. Iterator<Object> it1 = s1.iterator();


27. Iterator<Object> it2 = s2.iterator();




29. System.out.println("Set 1");


30. while(it1.hasNext())


31. {


32. System.out.println(it1.next());


33. }


34. System.out.println("Set 2");


35. while(it2.hasNext())


36. {


37. System.out.println(it2.next());


38. }




40. it1 = s1.iterator();


41. while(it1.hasNext())


42. {


43. System.out.println("hi");


44. try


45. {


46. ob = it1.next();


47. //System.out.println(ob);


48. if(s2.contains(ob))


49. {


50. // System.out.println("contain element is "+ob);


51. s3.add(ob);


52. }


53. }


54. catch(ClassCastException cse)


55. {


56. cse.printStackTrace();


57. }


58. catch(NoSuchElementException ne)


59. {


60. ne.printStackTrace();


61. }






64. }




66. return s3;


67. }






70. public static void main(String[] args) {


71. // TODO Auto-generated method stub


72. Set<Object> s1 = new HashSet<Object>();


73. Set<Object> s2 = new HashSet<Object>();


74. s1.add(3);


75. s1.add(4);


76. s1.add(5);


77. s1.add(7);


78. s1.add("hi");


79. s1.add(3.4);


80. s2.add(1);


81. s2.add(2);


82. s2.add(3);


83. s2.add(7);


84. s2.add("hi");


85. s2.add(new Object());


86. Set<Object> s3 = getIntersection(s1,s2);


87. Iterator<Object> it = s3.iterator();


88. System.out.println("Set 3");


89. while(it.hasNext())


90. {


91. System.out.println(it.next());


92. }


93. }


94. }

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