Browsers: You are suggested to view the demos through Internet Explorer ( NOT Microsoft Edge) since most web browsers do not support Java applets anymore nowadays. You may try old versions of the browsers in operating systems other than Windows, but it could involve security risks. 
Operating Systems: Java support ended with Chrome 44, Firefox 51 and Safari 11 respectively.Display Resolution: Make the display resolution lower when the applet shows up but is too small.
This section provides some general information about environments if you are to use a browser. Use the following command to execute the viewer: appletviewer where options could be omitted.įor example, if you are to watch the demo of rectangle quadtrees, use appletviewer
Afterwards, you are able to run appletviewer instead of browsers to visit the web sites containing applets. Appletviewer can be found in the Java bin folder, e.g., C:\Program Files (x86)\Java\jdk1.8.0_221\bin\appletviewer.exe. If not done so, you may need to locate the appletviewer manually when executing it. Change environment variables for convenience. E.g., I selected jdk-8u221-windows-i586.exe for my Windows 10 system. The latest versions are available here.Ĭhoose the correct version for your operating system, and you may need to create an Oracle account first (it is free). Note that the appletviewer does not need specific operating systems or browsers to run, so it would be convenient, especially without Windows and IE. If the solution based on browsers is not applicable, you may also use the appletviewer, a tool included in Java SE Development Kit (JDK), in order to view the demos. If there are any problems, feel free to contact the teaching assistant. This web page gives directions to run Java applets, which is necessary to view the demos demonstrating spatial data structures. Allow Java Application to Run on Internet Explorer Enable Java Applets to View Spatial Index Demos
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