[Java] how do I return the locations and positions of a given nested treemap public class Index { private final TreeMap index; public Index() {

[Java] how do I return the locations and positions of a given nested treemap

public class Index {

private final TreeMapTreeMapTreeSet>> index;

public Index() {

index = new TreeMap<>();

}

public boolean contains(String word) {

return index.containsKey(word);

}

public boolean contains(String word, String location) {

}

public boolean contains(String word, String location, int position) {

}

public int words() {

return index.size();

}

public int locations(String word) {

}

public int positions(String word, String location) {

}