Question

Could someone explain to me why is the result is 6? Thanks

String[] s = { "A", "B", "C", "D" };
String b = "ABRACADABRA";
int i = s.length - 1;
System.out.print( b.indexOf( s[ i ] ) );

I understand s length is 4, so i = 3, but then what does s[i] mean?

Answer 1

In Java strings and arrays are 0-indexed. This means that the first element has index 0, the second element has index 1, etc…

So s[3] means the fourth element of s which is D. The expression b.indexOf("D") is 6 because D is the seventh letter in ABRACADABRA and so it is at index 6.