The load factor is the measure that decides when to increase the capacity of the Map. The default load factor is 75% of the capacity. The threshold of a HashMap is approximately the product of current capacity and load factor.

What is load factor and rehashing in HashMap?

Rehashing of a hash map is done when the number of elements in the map reaches the maximum threshold value. Usually the load factor value is 0.75 and the default initial capacity value is 16. Once the number of elements reaches or crosses 0.75 times the capacity, then rehashing of map takes place.

What is good load factor in HashMap?

As a general rule, the default load factor (. 75) offers a good tradeoff between time and space costs. Higher values decrease the space overhead but increase the lookup cost (reflected in most of the operations of the HashMap class, including get and put).