How to add element at specific index/position in LinkedHashMap?

You could do this element adding to 1. or last place:

Adding to last place ► You just need to remove the previous entry from the map like this:

map.remove(key);
map.put(key,value);

Adding to first place ► It's a bit more complicated, you need to clone the map, clear it, put the 1. value to it, and put the new map to it, like this:

I'm using maps with String keys and Group (my custom class) values:

LinkedHashMap<String, Group> newMap=(LinkedHashMap<String, Group>) map.clone();
map.clear();
map.put(key, value);
map.putAll(newMap);

As you see, with these methods you can add unlimited amount of things to the begin and to the end of the map.

You can not change the order. It is insert-order (by default) or access-order with this constructor:

public LinkedHashMap(int initialCapacity, float loadFactor, boolean accessOrder)

• Constructs an empty LinkedHashMap instance with the specified initial capacity, load factor and ordering mode.

• Parameters: initialCapacity - the initial capacity loadFactor - the load factor accessOrder - the ordering mode - true for access-order, false for insertion-order

• Throws: IllegalArgumentException - if the initial capacity is negative or the load factor is nonpositive

See: LinkedHashMap