Java Collection Tutorial - Java TreeMap.put(K key, V value)

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Syntax

TreeMap.put(K key, V value) has the following syntax.

public V put(K key, V value)

Example

In the following code shows how to use TreeMap.put(K key, V value) method.

/*ww  w.j a  v  a 2 s.  com*/
import java.util.TreeMap;

public class Main {
   public static void main(String[] args) {
      
      TreeMap<Integer, String>  treemap = new TreeMap<Integer, String> ();
      
      treemap.put(2, "two");
      treemap.put(1, "one");
      treemap.put(3, "three");
      treemap.put(6, "six");
      treemap.put(5, "from java2s.com");   
      
      // Putting value at key 3
      System.out.println("Value before modification: "+ treemap);            
      System.out.println("Value returned: "+ treemap.put(3,"java2s.com"));      
      System.out.println("Value after modification: "+ treemap);
   }     
}

The code above generates the following result.

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