Question

Given this 2D array, which of the following statements are valid or invalid to use?

String[][] a = {{“It’s”, “always”, “a”, “hassle”}, {“converting”, “to”, “Celsius”}};

//valid or invalid?

a[1][2] = a[2][1];

a[1][0] = a[0][1];

a[-1][0] = a[1][0];

a[0][3] = a[1][3];

a[0][2] = a[1][1];

Answer 1

a[1][2] = a[2][1];  ->  invalid
a[1][0] = a[0][1];  ->  valid
a[-1][0] = a[1][0]; ->  invalid
a[0][3] = a[1][3];  ->  invalid
a[0][2] = a[1][1];  ->  valid