Java ConcurrentHashMap putAll() Method

by Online Tutorials Library July 22, 2022

Java ConcurrentHashMap putAll() Method

The putAll() method of ConcurrentHashMap class copies all of the mappings from the specified map to this one. These mappings replace any mappings that this map had for any of the keys currently in the specified map.

Syntax

Parameter

m – mappings to be stored in this map

Returns

Have void as return type.

Throws

No exception is thrown.

Example 1

  import java.util.concurrent.*;       class ConcurrentHashMapputAllExample1 {       public static void main(String[] args)       {           ConcurrentHashMap hashmap = new ConcurrentHashMap();  // creating new hash map          hashmap.put(100, “AAA”);           hashmap.put(101, “BBB”);           hashmap.put(102, “CCC”);           hashmap.put(103, “DDD”);           hashmap.put(104, “EEE”);           System.out.println(” Mappings : “+ hashmap);           ConcurrentHashMap newhashmap = new ConcurrentHashMap();           newhashmap.putAll(hashmap);           System.out.println(“New mappings : “+ newhashmap);       }   }  ,>,>,>,>

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Output:

Mappings : {100=AAA, 101=BBB, 102=CCC, 103=DDD, 104=EEE}  New mappings : {100=AAA, 101=BBB, 102=CCC, 103=DDD, 104=EEE}

Example 2

  import java.util.concurrent.*;       class ConcurrentHashMapputAllExample2 {       public static void main(String[] args)       {           ConcurrentHashMap hashmap = new ConcurrentHashMap();           hashmap.put(“K1”, “AAA”);           hashmap.put(“K2”, “BBB”);           hashmap.put(“K3”, “CCC”);           hashmap.put(“K4”, “DDD”);           hashmap.put(“K5”, “EEE”);           System.out.println(” Mappings : “+ hashmap);           ConcurrentHashMap newhashmap = new ConcurrentHashMap();           newhashmap.putAll(hashmap);           System.out.println(“New mappings : “+ newhashmap);       }   }   ,>,>,>,>

Test it Now

Output:

Mappings : {K1=AAA, K2=BBB, K3=CCC, K4=DDD, K5=EEE}  New mappings : {K1=AAA, K2=BBB, K3=CCC, K4=DDD, K5=EEE}

Next TopicJava ConcurrentHashMap

Java ConcurrentHashMap putAll() Method

Java ConcurrentHashMap putAll() Method

Syntax

Parameter

Returns

Throws

Example 1

Example 2

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