NavigableMap5.java

import java.util.NavigableMap;
import java.util.TreeMap;

public class NavigableMap5 {
    // firstEntry                   
    public static void main(String[] args) throws Exception {
        NavigableMap<Float, Integer> map = new TreeMap<>();
        map.put(1.8f,11 );
        map.put(2.6f, 9);
        map.put(3.4f, 78);
        map.put(4.3f, 5);
        map.put(5.6f, 1);
        map.put(6.8f, 3);
        System.out.println("Map:" + map);
        System.out.println("firstEntry:" + map.firstEntry());
        
    }
    
}