What is containsKey in Java?

HashMap containsKey() Method in Java The java. util. HashMap. containsKey() method is used to check whether a particular key is being mapped into the HashMap or not . It takes the key element as a parameter and returns True if that element is mapped in the map.

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Is key case sensitive?

While object properties are strings and they are case sensitive , you could use an own standard and use only lower case letters for the access. You could apply a String#toLowerCase to the key and use a function as wrapper for the access.

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