What is the meaning of

Question

n = line.indexOf("7");

in java language.

Answer 1

let's say for example you have a variable
String line="the 7 sins";
your variable n must be an int i suppose so if you execute this line
n = line.indexOf("7");
it will assign to n the value : 4
because that is the number of characters you need to read in order to reach the character 7.
i hope you understood my explanation.. let me know if you didn't.

Answer 2

assign to variable 'n' index of first character '7' in string 'line'.

See 'methods' here: https://docs.oracle.com/javase/7/docs/api/java/lang/String.html

Answer 3

it means that 'n' value will be the index of the first '7' character in the string line.
strating will be from the left to the right, and first index is 0 .

Answer 4

can you post the full code please

bcs I didn't recognized "line" is?

Answer 5

ofcouse Vincent is right iff the line is of string type