_1472.java

packagecom.fishercoder.solutions.secondthousand;

importjava.util.ArrayList;
importjava.util.List;

publicclass_1472 {
publicstaticclassSolution1 {
publicstaticclassBrowserHistory {

intcurr;
List<String> history;

publicBrowserHistory(Stringhomepage) {
history = newArrayList<>();
history.add(homepage);
curr = 0;
 }

publicvoidvisit(Stringurl) {
curr++;
history = history.subList(0, curr);
history.add(url);
 }

publicStringback(intsteps) {
curr -= steps;
if (curr < 0) {
curr = 0;
 }
returnhistory.get(curr);
 }

publicStringforward(intsteps) {
curr += steps;
if (history.size() <= curr) {
curr = history.size() - 1;
 }
returnhistory.get(curr);
 }
 }
 }
}