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Get lowest and highest key stored in TreeMap

import java.util.TreeMap; public class Main {   public static void main(String[] args) {     TreeMap<String, String> treeMap = new TreeMap<String, String>();     treeMap.put("1", "One");     treeMap.put("2", "Two");     treeMap.put("3", "Three");         treeMap.put("4", "Four");     treeMap.put("5", "Five");     System.out.println("Lowest key: " + treeMap.firstKey());     System.out.println("Highest key: " + treeMap.lastKey());   } }