A simple calculator program is not very good, I hope a lot of advice

JavaProject
...........\.classpath
...........\.project
...........\Constants
...........\.........\SketcherConstants.class
...........\.........\SketcherConstants.java
...........\Element$Circle.class
...........\Element$Curve.class
...........\Element$Line.class
...........\Element$Rectangle.class
...........\Element$Text.class
...........\Element.class
...........\Element.java
...........\ExtensionFilter.class
...........\ExtensionFilter.java
...........\FontDialog$StyleListener.class
...........\FontDialog.class
...........\FontDialog.java
...........\Images
...........\......\blue.gif
...........\......\circle.gif
...........\......\curve.gif
...........\......\green.gif
...........\......\line.gif
...........\......\new.gif
...........\......\open.gif
...........\......\print.gif
...........\......\rectangle.gif
...........\......\red.gif
...........\......\save.gif
...........\......\text.gif
...........\......\yellow.gif
...........\SketchCoverPage.class
...........\SketchCoverPage.java
...........\Sketcher$1.class
...........\Sketcher$2.class
...........\Sketcher.class
...........\Sketcher.java
...........\SketchFrame$ColorAction.class
...........\SketchFrame$FileAction.class
...........\SketchFrame$TypeAction.class
...........\SketchFrame.class
...........\SketchFrame.java
...........\SketchModel.class
...........\SketchModel.java
...........\SketchView$MouseHandler.class
...........\SketchView.class
...........\SketchView.java
...........\StatusBar$StatusPane.class
...........\StatusBar.class
...........\StatusBar.java

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