How i search a random string in file in java??

Question

String s1 = new String();
s1 = "Nakul"
then how i search for string s1 in any file.

Answer 1

Hello Nakul Singh

At first:

Either s1 = new String("Nakul");
or s1 = "Nakul";

You need to read a file.
Here is a good tutorial how to work with files: https://stackabuse.com/reading-and-writing-files-in-java/