Java Map.putAll(Map <? extends K ,? extends V > m)
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.
//w w w . ja va2 s. c om
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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