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RoyalUp
Asked: 2020-05-10 04:42:43 +0800 CST 2020-05-10 04:42:43 +0800 CST

Differences about replace() and put() method?

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I have a doubt and it is that when working with maps I don't know the difference between both methods, I know that put is to assign a key/value pair, but replace? As it says the name will be to replace either the key or value, but I am not clear with both methods. I hope you can help me

java

1 Answers

  1. Best Answer

    Although putthey replaceare similar, they are not exactly the same:

    • put: associates the value with the key in the map.
    • replace: associates the value with the key in the map, only if the key already exists in the map.

    The difference is whether the key has an associated value or not:

    • If the key already exists in the map, they both work the same (the value associated with the key is replaced).
    • If the key does not exist in the map: it putwill bind the value to that key, while replacedoing nothing.
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