java

The file emails.txt contains a list of email addresses like this:

From: janis joplin From: kurt cobain From: jimi hendrix From: john lennon From: john lennon From: freddie mercury From: kurt cobain

We need to convert it to a comma separated list of just the email addresses as such: kosmicblues@yahoo.com,meanriffs@altavista.net, imagine@hotmail.com, bohemianrhapsody@aol.com, lovescourtney@verizon.net

Write a program using streams that will read the emails.txt file and make this conversion, outputting each email address only once. Make sure your output line ends with a linefeed and not another comma-space.