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

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Syntax

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

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

Example

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

 /*from  w ww  .j  a v  a  2 s .  c o  m*/
import java.util.HashMap;
import java.util.Map;

public class Main {
  public static void main(String[] a) {
    Map<String,String> map = new HashMap<String,String>();
    map.put("key1", "value1");
    map.put("key2", "value2");
    map.put("key3", "value3");
    map.put(null, null);

    Map<String,String> map2 = new HashMap<String,String>();
    map2.put("key4", "value4");
    map2.put("key5", "value5");
    map2.put("key6", "value6");
    map.putAll(map2);

    System.out.println(map);
  }
}
  

The code above generates the following result.

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