Question

How to get the first key from TreeMap in Java

Answer 1

import java.util.TreeMap;
  
public class MyClass {
    public static void main(String args[]) {
        TreeMap<Integer, String> treemap = new TreeMap<Integer, String>();
         
        treemap.put(4, "java");
        treemap.put(2, "c++");
        treemap.put(5, "python");
        treemap.put(3, "c#");
         
        if (!treemap.isEmpty()){
            System.out.println(treemap.firstKey());
        }        
    }
}
   
   
   
/*
run:
   
2
  
*/

 

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