Question

1.The following statement gets an element from position 4 in an array named myArray:

x = myArray[4];

What is the equivalent operation using an array list named list.?

A	x = list.get();

B	x = list.get(4);

C	x = list.get[4];

D	x = list[4];

2.Consider the following code snippet:

ArrayList<Integer> num1 = new ArrayList<Integer>();
int data;
Scanner in = new Scanner(System.in);
for (int i = 0; i < 5; i++)
{
   data = in.nextInt();
   num1.add(data);
   if (data == 0 && num1.size() > 3)
   {
      num1.remove(num1.size() - 1);
   }
}
System.out.println("size is : " + num1.size());

What is the output of the given code snippet if the user enters 1,2,0,0,1 as the input?

A	size is : 1

B	size is : 0

C	size is : 2

D	size is : 4

3.What is the output of the following code snippet?

public static int check(ArrayList<Integer> listData)
{
   int sum = 0;
   for (int i = 0; i < listData.size(); i++)
   {
      sum = sum + listData.get(i);
   }
   return sum;
}
public static void main(String[] args)
{
   ArrayList<Integer> vdata = new ArrayList<Integer>();
   int rsum;
   for (int cnt = 0; cnt < 3; cnt++)
   {
      vdata.add(cnt + 1);
   }
   rsum = check(vdata);
   System.out.println(rsum);
}

A

2

B

4

C

3

D

6

4.What is the output of the following code snippet?

ArrayList<Integer> num;
num.add(4);
System.out.println(num.size());

A

4

B	Error because num is not initialized

C

0

D

1

5.Consider the following code snippet:

ArrayList<Integer> arrList = new ArrayList<Integer>();
for (int i = 0; i < arrList.size(); i++)
{
    arrList.add(i + 3);
}

What value is stored in the element of the array list at index 0? Think carefully about this.

A

0

B

3

C

6

D

None

6. Which statement is true about the code snippet below?

ArrayList<String> names = new ArrayList<String>();
names.add("John");
names.add("Jerry");
ArrayList<String> friends = names;
friends.add("Harry");

A	The final size of names is 2; the final size offriends is 3.

B	The final size of names is 3; the final size offriends is 2.

C	compilation error

D	The final size of names is 3; the final size of friends is 3.

7. Which statement is true about the code snippet below?

ArrayList<String> names = new ArrayList<String>();
names.add("John");
names.add("Jerry");
ArrayList<String> friends = new ArrayList<String>(names);
friends.add("Harry");

A	The final size of names is 3; the final size offriends is 3.

B	The final size of names is 3; the final size offriends is 2.

C	The final size of names is 2; the final size of friends is 3.

D	compilation error

8. Which statement is true about the code snippet below?

import java.util.*;
public class Test
{
    public static void main(String[] args) 
    {
        Scanner in = new Scanner(System.in);
        ArrayList inputs = new ArrayList();
        int ind = 0;
        System.out.print("Enter some numbers: ");
        while (in.hasNextDouble())
        {
            inputs.set(ind, in.nextDouble());
            ind++;
        }
        
        System.out.println(ind);
    }
}

A	The array list is full after 100 numbers are entered.

B	The code adds all input numbers to the array list.

C	The code has a run-time error.

D	The code has compile-time error.

9. Which one of the following is the correct code snippet for calculating the largest value in an integer array list aList?

A:

int max = aList[0]; for (int count = 1; count < aList.size();count++) { if (aList.get(count) > max) { max = aList.get(count); } }

B:	int max = 0; for (int count = 1; count < aList.size(); count++) { if (aList.get(count) > max) { max = aList.get(count); } }

C:	int max = aList.get(0); for (int count = 1; count < aList.size(); count++) { if (aList.get(count) > max) { max = aList.get(count); } }

D:	if (aList.size() > 0) { int max = aList.get(0); for (int count = 1; count < aList.size();count++) { if (aList.get(count) > max) { max = aList.get(count); } } }

10. What will be printed by the statements below?

ArrayList<String> names = new ArrayList<String>();
names.add("Annie");
names.add("Bob");
names.add("Charles");
names.set(2, "Doug");
names.add(0, "Evelyn");
System.out.print (names);
    

A	[Annie, Bob, Charles, Doug, Evelyn]

B	[Evelyn, Annie, Doug, Charles]

C	[Evelyn, Doug, Charles]

D	[Evelyn, Annie, Bob, Doug]

Answer 1

1) x = list.get(4);

2) size is : 4

3) size is : 4

4) D 6

5) B. 3

6) D. The final size of names is 3; the final size of friends is 3.

7) c. The final size of names is 2; the final size of friends is 3.

8) The code adds all input numbers to the array list.

9) D

10) D [Evelyn, Annie, Bob, Doug]


Thanks, PLEASE UPVOTE if helpful