I am supposed to read in a file containing many different email addresses and print them out using an array. The problem is I need to eliminate duplicate emails.
I was able to get my try / catch working and print out the email addresses. However, I am not sure how to go about removing the duplicates. I do not have an understanding of hashcode's or how to use a Set
yet. Any assistance would be appreciated.
Here is what I have so far:
import java.util.Scanner;
import java.io.*;
public class Duplicate {
public static void main(String[] args) {
Scanner keyboard = new Scanner(System.in);
System.out.println("Enter file name: ");
String fileName = keyboard.nextLine();
if (fileName.equals("")) {
System.out.println("Error: User did not specify a file name.");
} else {
Scanner inputStream = null;
try {
inputStream = new Scanner(new File(fileName));
} catch (FileNotFoundException e) {
System.out.println("Error: " + fileName + " does not exist.");
System.exit(0);
}
String[] address = new String[100];
int i = 0;
while (inputStream.hasNextLine()) {
String email = inputStream.nextLine();
// System.out.println(email);
address[i] = email;
System.out.println(address[i]);
i++;
}
}
}
}
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