java to achieve a simple jigsaw puzzle, there are many unexpected features

Puzzle
......\.classpath
......\.project
......\.settings
......\.........\org.eclipse.core.resources.prefs
......\bin
......\...\canvas
......\...\......\MyCanvas.class
......\...\cell
......\...\....\Cell.class
......\...\frame
......\...\.....\MyFrame.class
......\...\images
......\...\......\pic_1.jpg
......\...\......\pic_1_1.jpg
......\...\......\pic_1_2.jpg
......\...\......\pic_1_3.jpg
......\...\......\pic_1_4.jpg
......\...\......\pic_1_5.jpg
......\...\......\pic_1_6.jpg
......\...\......\pic_1_7.jpg
......\...\......\pic_1_8.jpg
......\...\......\pic_1_9.jpg
......\src
......\...\canvas
......\...\......\MyCanvas.java
......\...\cell
......\...\....\Cell.java
......\...\frame
......\...\.....\MyFrame.java
......\...\images
......\...\......\pic_1.jpg
......\...\......\pic_1_1.jpg
......\...\......\pic_1_2.jpg
......\...\......\pic_1_3.jpg
......\...\......\pic_1_4.jpg
......\...\......\pic_1_5.jpg
......\...\......\pic_1_6.jpg
......\...\......\pic_1_7.jpg
......\...\......\pic_1_8.jpg
......\...\......\pic_1_9.jpg

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