oldAccount text file is Nicholas, Diana, Eric,Andy, Alex , AMy
CurrentAccount text file is Andy Alex Amy Kelvin cherry Betty
import java.util.*;
import java.io.*;
public class Example2
{
public static void main(String[]args) throws IOException
{
System.out.print (" Old Account is: ");
System.out.println();
TreeSet<String> oldAcc = new TreeSet<String>();
Scanner oldacc = new Scanner(new FileReader("OldAccount.txt"));
while (oldacc.hasNext()) {
String Line =oldacc.nextLine();
oldAcc.add(Line);
}
System.out.println(oldAcc);
oldacc.close();
System.out.print (" Current Account is: ");
System.out.println();
TreeSet<String> CurrAcc = new TreeSet<String>();
Scanner curracc = new Scanner(new FileReader("CurrentAccount.txt"));
while (curracc.hasNext()) {
String Line1 =curracc.nextLine();
CurrAcc.add(Line1);
}
System.out.println(CurrAcc);
curracc.close();
TreeSet<String> GradAcc = new TreeSet<String>();
GradAcc.addAll(oldAcc);
GradAcc.removeAll(CurrAcc);
System.out.print("The Grad Account is " + GradAcc);
}
}
The out put of GradAcc should is Diana , Eric , Nicholas
But My output is Alex ,Andy , Diana , Eric , Nicholas
trim returns a String (as the API docs state), so where are you storing that String? Strings are immutable (which you should already know) which means you cannot change their contents. You can only create new Strings.
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