Question

If you allocate the following ArrayList, how would you add a new element to it?

ArrayList<String> myList = new ArrayList<String>();

  

add.myList("Mary");

   

myList.insert("Mary");

   

myList.add("Mary");

   

myList + "Mary";

What method can you use to determine the number of elements in the ArrayList myList?

  

myList.size()

   

myList.length()

   

myList.count()

   

myList.capacity()

What will be printed by the following code segment?

ArrayList<Integer> numList = new ArrayList<>();

numList.add(1);

numList.add(5);

numList.add(10);

for(Integer i: numList){  

System.out.print(i + " ");

}

  

1 5 10

   

1

   

5

   

10

   

Nothing. The segment will not compile.

Answer 1

1)

To add new element into list use myList.add("Mary");

So the answer is : myList.add("Mary");

2)

To determine the number of elements in the ArrayList myList myList.size() is used.

if you use myList.length(), myList.count() or myList.capacity() then it will return error.

So the answer is: myList.size()

3)

The program will print each of the element from list and separate it by space.

As numList contain 1,5 and 10 so it print 1 5 10

import java.util.*;
public class Main
{
   public static void main(String[] args) {
  
       ArrayList<Integer> numList = new ArrayList<>();
       //add 1 to numList
numList.add(1);
//add 5 to numList
numList.add(5);
//add 10 to numList
numList.add(10);
//using for each print elements of the list
for(Integer i: numList){
//print each of the element from list and separate it by space.
System.out.print(i + " ");
}
   }
}

So the answer is: 1 5 10