Help with this asap, Overriding Object class methods

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Java

A class Connection maintains attributes database url, user name and password. Class needs to maintain the number of count of Connection class. Every time a connection object is created the count must be incremented and every time it is set to null count must be decremented and object must be garbage collected explicitly by the code. At any point, there must be only 10 connection object in the memory. Write a java class to achieve this.