getting browser url visited in java

public class WebBrowser {
Stack <string> backward = new Stack <string>(); // Backward pages
Stack <string> forward = new Stack <string>(); // Forward pages

public WebBrowser(Scanner sc) {
while (sc.hasNext()) {
String input = sc.nextLine();

switch(input) {
case "BACKWARD":
if (!backward.empty())
forward.push(backward.pop()); // Remove from backward, add to forward
break;

case "FORWARD":
if (!forward.empty())
backward.push(forward.pop()); // Remove from forward, add to backward
break;

default:
backward.push(input); // New page opened
while (!forward.empty()) // Clear forward stack
forward.pop();
break;
}
if (backward.empty() && !forward.empty()) // Add forward pages to history
backward.push(forward.pop());
}

if (backward.empty() && forward.empty())
System.out.println("Browsing history is empty.");

else {

// If there is only 1 page, current page in forward stack else in backward
String current = (backward.empty()) ? forward.peek() : backward.peek();

System.out.println("Browsing History:");

while (!forward.empty()) // In order to print from least to most recent
backward.push(forward.pop());

while (!backward.empty())
forward.push(backward.pop());

while (!forward.empty())
System.out.println(forward.pop());

System.out.println("Current Page:");
System.out.println(current);
}
}

public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
WebBrowser bc = new WebBrowser(sc);

}

}