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import java.util.*;
class Arraylist
{
public static void main(String args[])
{
ArrayList obj = new ArrayList();
obj.add("A");
obj.add("B");
obj.add("C");
obj.add(1, "D");
System.out.println(obj);
}
}
a) [A, B, C, D]
b) [A, D, B, C]
c) [A, D, C]
d) [A, B, C]
b
Explanation: obj is an object of class ArrayList hence it is an dynamic array which can increase and decrease its size. obj.add(“X”) adds to the array element X and obj.add(1,”X”) adds element x at index position 1 in the list, Hence obj.add(1,”D”) stores D at index position 1 of obj and shifts the previous value stored at that position by 1.
Output:
$ javac Arraylist.java
$ java Arraylist
[A, D, B, C].