Merging 2 Hashmaps into 1

What is the easyiest way to merge 2 Hashmaps into 1?
So Say h1, h2 and hashmaps with data in, h3 is a empty hashmap that i want to contain all the values of h1 and h2.
Only way I know how is to loop through each Hashmap and add the value pairs to the new hashmap.
Is there a way to do this much easyier like
    h3 += h1;
    h3 += h2;or some method ?
    h3.add(h1);
    h3.add(h2);TIA, Dale

Sorry maybe I didn't make it clear, i was quessing what the method to do what i wanted was.
I'll try putAll, sounds like what im after.

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Merging 2 Hashmaps into 1

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