To refine the eight queens problem Program plan: In the file “ Queen.java ”, create a class “ Queen”, Declare necessary variables. Define the constructor to construct a queen at a given position. Define a method “attacks()” to check whether the queen attacks another. Define a method “toString()” to get the formatted string. Define a method “equals()” to check whether both objects are equal. In the file “ PartialSolution.java ”, create a class “ PartialSolution”, Declare an array of “Queen” objects. Initialize necessary variables. Define the constructor to construct a partial solution of a given size. Define a method “examine()” to examine a partial solution. Define a method “extend()” to produce all extensions of the partial solution. Define a method “toString()” to get the formatted string. In the file “ EightQueens.java ”, create a class “ EightQueens”, Define the “main()” method, Create “PrintWriter” object. Print the content. Call the method “solve()”. Define a method “solve()” to print all solutions to the problem that can be extended from a given partial solution.

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Chapter 13, Problem 24PE

Program Plan Intro

To refine the eight queens problem

Program plan:

In the file “Queen.java”, create a class “Queen”,

Declare necessary variables.

Define the constructor to construct a queen at a given position.

Define a method “attacks()” to check whether the queen attacks another.

Define a method “toString()” to get the formatted string.

Define a method “equals()” to check whether both objects are equal.

In the file “PartialSolution.java”, create a class “PartialSolution”,

Declare an array of “Queen” objects.

Initialize necessary variables.

Define the constructor to construct a partial solution of a given size.

Define a method “examine()” to examine a partial solution.

Define a method “extend()” to produce all extensions of the partial solution.

Define a method “toString()” to get the formatted string.

In the file “EightQueens.java”, create a class “EightQueens”,

Define the “main()” method,

Create “PrintWriter” object.

Print the content.

Call the method “solve()”.

Define a method “solve()” to print all solutions to the problem that can be extended from a given partial solution.

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