Answer:
a[0]=2*a[a.length-1];
Explanation:
In the following statement, we initialize a new value to the integer data type array variable 'a' by passing the index value 0 with the variable inside the square brackets [] because the array indexing starts with 0, so the array indexing of the first element is 0 and then initialize the value that is equal to the twice of that element which is in the last.