Question

EDITED:

import java.io.BufferedReader;
import java.io.IOException;
import java.util.HashSet;
import java.util.Set;

public class y {

    Set<String> setA = new HashSet<String>();

    Set<String> getSetA(BufferedReader br) throws IOException {
        String line;
        while ((line = br.readLine()) != null) {
            setA.add(line);

        } 
        br.close();
            Iterator<String> iter = setA.iterator();    
            while (iter.hasNext()) {
            System.out.println(iter.next());
            }
        return setA;

    }
}

I try to read every line of a file into element of the Set. But it seem like only the n line is added into the Set. The println only print out the n line in the whole text what wrong with my code?

Answer 1

replace your if with a while.

while ((line = br.readLine()) != null) {
   setA.add(line);
}

and then later

Iterator<String> iter = setA.iterator();    
while (iter.hasNext()) {
   System.out.println(iter.next());
}