Most effective presently Lenovo ThinkCentre M78 2111C3U Desktop Computer - Tower, AMD A6-5400B price compare

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Lenovo ThinkCentre M78 2111C3U Desktop Computer - Tower, AMD A6-5400B price compare

A new era of performance and manageability ThinkCentre M Series continues to expand cost- and management-control capabilities; providing enterprise users and IT managers with smarter ways to be more productive. Our latest models offer improved overall system performance; optimized for the most demanding applications; from video editing to 2D/3D image design and more. Expanded power management compatibilities help you achieve new levels of energy efficiency; while Dual Independent Display (DID) support enables you to view up to four screens simultaneously. Lower costs while improving productivity across your enterprise.

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Override equals and hashCode in Java

Equals and hashCode in Java are two fundamental method which is declared in Object class and part or core Java library. equals() method is used to compare Objects for equality while hashCode is used to generate an integer code corresponding to that object. equals and hashCode has used extensively in Java core library like they are used while inserting and retrieving Object in HashMap, see how HashMap works in Java for full story, equals method is also used to avoid duplicates on HashSet and other Set implementation and every other place where you need to compare Objects. Default implementation of equals() class provided by java.lang.Object compares memory location and only return true if two reference variable are pointing to same memory location i.e. essentially they are same object. Java recommends to override equals and hashCode method if equality is going to be define by logical way or via some business logic and many classes in Java standard library does override it e.g. String overrides equals,  whose implementation of equals() method return true if content of two String objects are exactly same. Integer wrapper class overrides equals to perform numerical comparison etc.

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