TreeMap K firstKey() method in java
import java.util.TreeMap; public class TreeMapFirstKeyMethodExample { public static void main(String[] args) { TreeMap<Integer, String> tm = new TreeMap<Integer, String>(); tm.put(2, "tejas"); tm.put(1, "om"); tm.put(3, "tarun"); tm.put(6, "siddarth"); tm.put(5, "fanindra"); System.out.println("first key of TreeMap: "); System.out.println("First key is: " + tm.firstKey()); } }