marketingbops.blogg.se - How to create a class in java with source code

#How to create a class in java with source code update#
#How to create a class in java with source code code#

All sub panels and fields are placed in a GridLayout of 3x3. SudokuPanel contains 9 sub panels each containing 9 fields. It also creates the Game class, and adds SudokuPanel and ButtonPanel as observers to it. This class builds up the user interface by creating a JFrame and placing SudokuPanel and ButtonPanel inside this frame. The view also is the entry point of this application the Sudoku class contains the main method. These updates of the view are limited to changing colors and changing the number of a field. The view responses to this notification and updates. The controllers react to user input and implement changes to the model.

There is not much to say about the view part, only the structure of the panels.

True -> continue (resulting in returning true).Ĭheck = game = solution.

Restore value of current field to 0 (meaning it is blank).

False -> more than one solution found, stop searching.

True -> one or no solution found, continue search.

Call this method recursively and instantly check against the returned value.

If the returned value equals -1, perform a break resulting a return of true.

While the list contains numbers, execute the following:.

Check if current field is a blank (equals 0).

Found -> increase numberOfSolutions and return true if it equals 1 false otherwise.

There will always be at least one solution (hence game is an incomplete solution), so if there are less than two solutions, the game is valid and the method returns true. If a second solution is found, then the search will be stopped and the method returns false. Even after finding a solution, the search continues by putting the next valid value in an open field. To achieve this, all open fields are filled with the first valid value. Additionally, there should only be one solution existing.

#How to create a class in java with source code code#

This part will never be reached, hopefully.Ĭopy Code private boolean isValid( int game) ) Ī valid game has in every row, every column, and every region the numbers 1 to 9.

If this variable is not null, it is returned otherwise, the current location is put back to 0 (meaning the field is a blank).

The method is recursively called with an increase of the index, and the returning value is stored in a variable.

Found number is placed on the current location.

If there's no next possible number (return value of -1), null is returned.

The next possible number is obtained by the method getNextPossibleNumber(int, int, int, List), which will be explained later on.

As long as there are numbers in the ArrayList, the following will be executed:.

Shuffling is important because otherwise you always get the same solution.

An ArrayList is filled with the numbers 1 to 9 and shuffled.

Y (of current field) is found by dividing the current index by the count of fields in a row.

X (of current field) is found by finding the remainder of the division of the current index by the count of fields in a row using the modulo operation.

This is achieved by the method below, which needs to be called by the user as generateSudoku(new int, 0). Generate Solutionīefore we can start generating a game, we must first generate a solution.

#How to create a class in java with source code update#

When the Game class executes setChanged() followed by notifyObservers(.), the observers will execute their update(.) method.īesides the Game class, the model consists of an enumeration called UpdateAction which will tell observers what kind of update has taken place.

This particular application contains two observers, ButtonPanel and SudokuPanel. Check user input against generated solution īecause the Game class extends Observable, it can and does notify observers when certain changes have been performed.The most important part of this application is in the Game class, which includes the following functionality: The rules used in this implementation are as follows: After checking for errors, the program marks valid fields green and invalid fields red. Turning on help will mark all possible fields for the selected number. This version includes an intuitive interface with the ability to use help and to check for errors. This article is on the implementation of a Sudoku game in Java.