/*********************************************************************************

* (Name for both genders) Write a program that prompts the user to enter one of *

* the filenames described in Programming Exercise 12.31 and displays the names *

* that are used for both genders in the file. Use sets to store names and find *

* common names in two sets. Here is a sample run: *

*********************************************************************************/

importjava.util.*;

publicclassExercise_21_12 {

publicstaticvoidmain(String[]args) {

Scannerinput =newScanner(System.in);

System.out.print("Enter a file name for baby name ranking: ");

StringfileName =input.next();

Set<String>set1 =newHashSet<>();

Set<String>set2 =newHashSet<>();

try {

java.net.URLurl =newjava.net.URL(

"http://www.cs.armstrong.edu/liang/data/" +fileName);

ScannerinputStream =newScanner(url.openStream());

while (inputStream.hasNext()) {

inputStream.next();

set1.add(inputStream.next());

inputStream.next();

set2.add(inputStream.next());

inputStream.next();

}

}

catch (java.net.MalformedURLExceptionex) {

System.out.println("Invalid URL");

}

catch (java.io.IOExceptionex) {

System.out.println("I/O Errors; no such file");

}

set1.retainAll(set2);

System.out.println(set1.size() +" names used for both genders");

System.out.print("They are ");

for (Stringname:set1) {

System.out.print(name +" ");

}

System.out.println();

}

}