JAVA to write a Sudoku game can generate a unique solution as well as a variety of difficulty

Sudoku\build\built-jar.properties
......\.....\classes\CSSudoku.class
......\.....\.......\IndexButton.class
......\.....\.......\Sudoku$1.class
......\.....\.......\Sudoku$2.class
......\.....\.......\Sudoku$3.class
......\.....\.......\Sudoku$4.class
......\.....\.......\Sudoku$5.class
......\.....\.......\Sudoku$SudokuPanel.class
......\.....\.......\Sudoku.class
......\.....\.......\Sudoku.rs
......\build.xml
......\dist\README.TXT
......\....\Sudoku.jar
......\manifest.mf
......\nbproject\build-impl.xml
......\.........\genfiles.properties
......\.........\private\private.properties
......\.........\.......\private.xml
......\.........\project.properties
......\.........\project.xml
......\src\Sudoku.java
......\build\generated-sources\ap-source-output
......\.....\classes
......\.....\empty
......\.....\generated-sources
......\nbproject\configs
......\.........\private
......\build
......\dist
......\nbproject
......\src
Sudoku
基于挖洞思想的数独游戏生成算法.pdf

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