Selecting random key and value sets from a Map in Java

Question

I want to get random keys and their respective values from a Map. The idea is that a random generator would pick a key and display that value. The tricky part is that both k

Answer 1

if your keys are integer, or something comparable, you can use TreeMap to do that.

TreeMap treeMap = new TreeMap<>();
int key = RandomUtils.ranInt(treeMap.lastKey());
int value = treeMap.ceilingKey(key);