How to create Singleton Design Pattern in Java
A design pattern is a general solution to a common problem. The singleton pattern is used to restricts the instantiation of a class to one single object.
How to get CPU cores in Java
A system may contain multiple physical CPUs (central processing unit), and can contain one or more cores (processors). Also, each core can have multiple threads, usually 2. (Hyper-threading Technology from Intel CPUs).
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