31. What is the output of this program?
    

    import java.util.*;
        public class ArrayExample 
        {
            public static void main(String args[]) 
            {
                int arr[] = new int [10];
                for (int k = 10; k > 0; k--)
                    arr[10 - k] = k;
                Arrays.sort(arr);
                for (int k = 0; k < 7; ++k)
                	System.out.print(arr[k]);
            }
        }
    

1. 1. 1245

   
   
   

   2. 12345

   
   
   

   3. 123

   
   
   

   4. 123450

   
   
   

   5. 1234567

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: E

   Arrays.sort(arr) method sorts the array into 1,2,3,4,5,6,7.

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32. Which of these methods must be made static?

1. 1. delete()

   
   
   

   2. run()

   
   
   

   3. finalize()

   
   
   

   4. main()

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   main() method must be declared static, main() method is called by Java runtime system before any object of any class exists.

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33. Which of the following statements are incorrect?

1. 1. Arrays in java are implemented as an object

   
   
   

   2. All arrays contain an attribute-length which contains the number of elements stored in the array

   
   
   

   3. Variables declared as final occupy memory

   
   
   

   4. final variable must be initialized at the time of declaration

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   Variables declared as final occupy memory

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34. Which of the following statements are incorrect?

1. 1. static methods must only access static data

   
   
   

   2. when object of class is declared, each object contains its own copy of static variables

   
   
   

   3. static methods can call other static methods only

   
   
   

   4. static methods can not refer to this or super in any way

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   All objects of class share same static variable, when object of a class are declared, all the objects share same copy of static members, no copy of static variables are made.

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35. Which of these cannot be declared static?

1. 1. variable

   
   
   

   2. method

   
   
   

   3. class

   
   
   

   4. object

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   static statements are run as soon as class containing then is loaded, prior to any object declaration.

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