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Get first key from NavigableMap in Java
To display the first key from NavigableMap in Java, use the firstKey() method.
Let us first create NavigableMap −
NavigableMap<String, Integer> n = new TreeMap<String, Integer>(); n.put("A", 498); n.put("B", 389); n.put("C", 868); n.put("D", 988); n.put("E", 686); n.put("F", 888); n.put("G", 999); n.put("H", 444); n.put("I", 555); n.put("J", 666);
Get the first key now −
n.firstKey()
The following is an example to get the first key from NavigableMap −
Example
import java.util.*; public class Demo { public static void main(String[] args) { NavigableMap<String, Integer> n = new TreeMap<String, Integer>(); n.put("A", 498); n.put("B", 389); n.put("C", 868); n.put("D", 988); n.put("E", 686); n.put("F", 888); n.put("G", 999); n.put("H", 444); n.put("I", 555); n.put("J", 666); System.out.println("NavigableMap elements...
"+n); System.out.println("First Key = "+n.firstKey()); } }
Output
NavigableMap elements... {A=498, B=389, C=868, D=988, E=686, F=888, G=999, H=444, I=555, J=666} First Key = A
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