Monthly Archives: December 2012

Sudoku Checker and Solver

Sudoku is a puzzle where we need to fill a 9×9 grid with digits from 1 to 9 such that each column, each row, and each of the nine 3×3 blocks contains all of the 1-9 digits. Sudoku Checker The

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Polymorphism in Java

A polymorphic reference is a variable that can refer to different types of objects. A reference can refer to an object of its class, or to an object of any subclass. When we call a method through a polymorphic reference,

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Inheritance in Java

The following are different relationships between classes. Let A and B be two classes. Dependency: A uses B Aggregation: A has-a B (as an attribute) Inheritance: B is a kind of A Subclass and Superclass In Java, new classes (child

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Writing Classes in Java

There are two meanings of “class”. A class could be: a code library (a collection of methods). For example, java.lang.Math contains methods for performing basic numeric operations. an object data type (a description of a concept). For example, java.lang.String represents

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