Java WeakHashMap.putAll(Map <? extends K ,? extends V > m)
Syntax
WeakHashMap.putAll(Map <? extends K ,? extends V > m) has the following syntax.
public void putAll(Map <? extends K ,? extends V > m)
Example
In the following code shows how to use WeakHashMap.putAll(Map <? extends K ,? extends V > m) method.
/*from w ww . j a v a2 s . c o m*/
import java.util.Map;
import java.util.WeakHashMap;
public class Main {
public static void main(String[] args) {
Map<String, String> weakHashMapOne = new WeakHashMap<String, String> ();
Map<String, String> weakHashMapTwo = new WeakHashMap<String, String> ();
System.out.println("Populating two Maps");
weakHashMapOne.put("1", "first");
weakHashMapOne.put("2", "two");
weakHashMapOne.put("3", "from java2s.com");
weakHashMapTwo.put("1", "1st");
weakHashMapTwo.put("2", "2nd");
weakHashMapTwo.put("3", "3rd");
// checking Map
System.out.println("Before - Map 1: "+weakHashMapOne);
System.out.println("Before - Map 2: "+weakHashMapTwo);
// putting map 2 into map1
weakHashMapOne.putAll(weakHashMapTwo);
System.out.println("After - Map 1: "+weakHashMapOne);
System.out.println("After - Map 2: "+weakHashMapTwo);
}
}
The code above generates the following result.
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