A problem with reading files

[chenw]

When openning a file, we can use "readLine()" to read lines of this file one by one .Could I read a specific line such as the sixth line immediately?

[Bill Hause]

You can't immediately read the sixth line without first reading the lines before it. This is because you must count the new line characters in the file to know what line you are on.
E.g. after reading five '\n' characters you know you are on line six.
You could write a method like the one below but it still needs to read each line.
String readLine(int n) {
for (int i=0; i<(n-1); i++)
readLine();
return readLine();
}

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