46. What is the output of this program?
    

    import java.util.*;
       public class hashtable_Example
        {
            public static void main(String args[]) 
            {
                Hashtable object = new Hashtable();
                object.put("I", new Integer(10));
                object.put("L", new Integer(60));
                object.put("U", new Integer(25));
                System.out.print(object.contains(new Integer(25)));
            }
        }
    

1. 1. True

   
   
   

   2. U

   
   
   

   3. L

   
   
   

   4. False

   
   
   

   5. None of these

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   Hashtable object object contains values 10, 60, 25 when object.contains(new Integer(25)) is executed it searches for 25 in the hashtable since it is not present true is returned.

---

47. Which of these methods is used to retrieve the elements in properties object at specific location?

1. 1. ElementAt()

   
   
   

   2. get()

   
   
   

   3. getProperty()

   
   
   

   4. Elementat()

   
   
   

   5. None of these

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   getProperty()

---

---

48. Which of these is a class which uses String as a key to store the value in object?

1. 1. Dictionary

   
   
   

   2. Properties

   
   
   

   3. ArrayList

   
   
   

   4. Array

   
   
   

   5. None of these

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   Properties

---

49. Which of these is the interface of legacy is implemented by Hashtable and Dictionary classes?

1. 1. Hashtable

   
   
   

   2. HashMap

   
   
   

   3. Enumeration

   
   
   

   4. Map

   
   
   

   5. None of these

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   Dictionary, Map & Hashtable all implement Map interface hence all of them uses keys to store value in the object.

---

---

50. Which of these method is used to insert value and its key?

1. 1. addElement()

   
   
   

   2. insertElement()

   
   
   

   3. put()

   
   
   

   4. set()

   
   
   

   5. None of these

   
   
   

---

1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   put()

---