Question

What is the output of the following?

class LowHighSwap
{
static void doIt( int[] z )
{
int temp = z[ -1 ] ;
z[ -1 ] = z[0] ;
z[0] = temp;
}
}

class TestIt
{
public static void main ( String[] args )
{
int[] myArray = {1, 2, 3, 4, 5} ;

LowHighSwap.doIt( myArray );

for (int j=0; j System ( myArray[j] + " " ) ;
}
}
a.0 1 2 3 4 5
b.0 2 3 4 5
c.1 2 3 4 5
d.0
e.0 1 2 3 4

Answer 1

The given code will throw an ArrayIndexOutOfBoundsException because arrays in Java cannot have negative indices. No output will be produced other than an error message.

Step-by-step explanation:

The code given contains an attempt to access an array with a negative index, which will result in an ArrayIndexOutOfBoundsException in Java. Since arrays in Java are zero-based, there is no such thing as a negative index, and trying to access z[-1] will not compile or run. Therefore, there will not be any valid output, and instead, the program will terminate with an exception error before it can reach the loop that prints the array elements.

The output of the code is 1 2 3 4 5.

The doIt() method in the LowHighSwap class swaps the first and last elements of the input array. In the main() method of the TestIt class, the doIt() method is called with the myArray array as an argument.

After the swap, the updated array is printed using a for loop. The loop iterates over the elements of the array and prints each element separated by a space. The result is 1 2 3 4 5.