Given: 3. import java.util.*; 4. public class Mixup { 5. public static void main(String[] args) { 6. Object o = new Object(); 7. // insert code here 8. s.add("o"); 9. s.add(o); 10. } 11. } And these three fragments: I. Set s = new HashSet(); II. TreeSet s = new TreeSet(); III. LinkedHashSet s = new LinkedHashSet(); When fragments I, II, or III are inserted, independently, at line 7, which are true? (Choose all that apply.)

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  1. Fragment I compiles

  2. Fragment II compiles

  3. Fragment III compiles

  4. Fragment I executes without exception

  5. Fragment II executes without exception

  6. Fragment III executes without exception

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Correct Option: A,B,C,D,F

AI Explanation

To answer this question, let's go through each fragment and determine if it compiles and executes without exception when inserted at line 7:

Fragment I: Set s = new HashSet();

  • This fragment compiles because HashSet is a valid implementation of the Set interface.
  • It executes without exception because HashSet allows for the addition of objects using the add() method.

Fragment II: TreeSet s = new TreeSet();

  • This fragment compiles because TreeSet is a valid implementation of the Set interface.
  • It executes without exception because TreeSet allows for the addition of objects using the add() method.

Fragment III: LinkedHashSet s = new LinkedHashSet();

  • This fragment compiles because LinkedHashSet is a valid implementation of the Set interface.
  • It executes without exception because LinkedHashSet allows for the addition of objects using the add() method.

Therefore, the correct answers are: A) Fragment I compiles B) Fragment II compiles C) Fragment III compiles D) Fragment I executes without exception F) Fragment III executes without exception

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