Java Collection Tutorial - Java TreeMap.putAll(Map <? extends K ,? extends V > map)

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Syntax

TreeMap.putAll(Map <? extends K ,? extends V > map) has the following syntax.

public void putAll(Map <? extends K ,? extends V> map)

Example

In the following code shows how to use TreeMap.putAll(Map <? extends K ,? extends V > map) method.

/*from  ww  w .j  av  a2  s.c  o m*/
import java.util.TreeMap;

public class Main {
   public static void main(String[] args) {

      TreeMap<Integer, String>  treemap = new TreeMap<Integer, String> ();
      TreeMap<Integer, String>  treemap_putall = new TreeMap<Integer, String> ();
      
      // populating tree map
      treemap.put(2, "two");
      treemap.put(1, "one");
      treemap.put(3, "three");
      treemap.put(6, "six");
      treemap.put(5, "from java2s.com");
      
      treemap_putall.put(1, "1"); 
      treemap_putall.put(2, "2");
      treemap_putall.put(7, "7");      
      
      System.out.println("Value before modification: "+ treemap);
      
      // Putting 2nd map in 1st map
      treemap.putAll(treemap_putall);
      
      System.out.println("Value after modification: "+ treemap);
   }     
}

The code above generates the following result.

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