Question

Assume that an ArrayList of integers named a has been declared and initialized. Write a single statement that assigns a new value to the first element of the ArrayList. The new value should be equal to twice the value stored in the last element of the ArrayList.

Answer 1

Following are the code to this question:

a[0] = a[a.length-1] * 2; //assign value in the first element in array

Step-by-step explanation:

In the given question, it is declared, that an array list "a" is declared, that contains only integer number, in which we assign a number in the array list first element so, the code to this question can describe as follows:

• As we known array indexing always starts with 0. so, in the above code an array "a[0]" is used, which uses "length-1" to calculate the total length of the array and then subtract from 1.
• After calculating array length we multiply the value by 2, in this, the new value is twice to the last value, which is stored in the array.