Java applet

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使用appletviewer来启动Java小程序查看器
docs.oracle.com/javase/10/tools/appletviewer.htm
例子:(格拉斯哥大学)
maths.gla.ac.uk/wws/cabripages/hyperbolic/experiment.html
maths.gla.ac.uk/wws/cabripages/inversive/sides.html
但如果去maths.gla.ac.uk/wws/cabripages/hyperbolic/CabriJava.jar下载jar文件再打开,就提示已损坏:

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www-cabri.imag.fr/cabrijava/
cabri.net/cabrijava/CnkH04CJ.html
chartwellyorke.com/cabrijava.html
mste.illinois.edu/dildine/cabri/cabrijava/Cycloide.html
mathsnut.net/technology/cabri/transformations/reflection3.html
mathematiques4.free.fr/pagesrouges/pagescabrijava/milieux3.htm
web.cortial.net/bibliohtml/cabrijava.html
sardes.inrialpes.fr/_kuntz/articles/INET98/index.html
ypsilon.altervista.org/Cabri/Simmass2.htm
patrickmoisan.net/documents/publications/cw2001/2001/contributio ... /menu2/division.html
dhenriet.perso.centrale-marseille.fr/microegimfig/package2.htm

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personal.math.ubc.ca/~cass/www/henon.html
请问,这个Heron Map插件如何查看呢

加载: 找不到类HenonApplet.class。
java.lang.ClassNotFoundException: HenonApplet.class
        at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:220)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
        at sun.applet.AppletClassLoader.loadClass(AppletClassLoader.java:153)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
        at sun.applet.AppletClassLoader.loadCode(AppletClassLoader.java:637)
        at sun.applet.AppletPanel.createApplet(AppletPanel.java:799)
        at sun.applet.AppletPanel.runLoader(AppletPanel.java:728)
        at sun.applet.AppletPanel.run(AppletPanel.java:378)
        at java.lang.Thread.run(Thread.java:748)

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www-personal.umich.edu/~pion/WebGeom/sketch-test2n.html
JavaSketchpad DR4.05(g1) Release March 2003 Copyright (C) 1996-2003 by KCP Technologies, Inc.