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 …
Year: 2019
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, …
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 …
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 …