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Published 20 hours ago • verified publisher icon liuyubobobo
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Codes of my MOOC Course <Play with Algorithm Visualization>. Updated contents and more demos or practices are also included. 我在慕课网上的课程《看得见的算法》Java示例代码。课程的更多更新内容及辅助练...

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Circle-Animation project throws java.lang.NullPointerException.

定位：02-Java-Swing-Basics\Chapter-02-Completed-Codes\Circle-Animation\src\AlgoFrame.java -> AlgoCanvas -> paintComponent 问题：在一些运行中，抛出Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException 原因：paintComponent未经过render方法中的repaint方法自行调用，circles数组存在未定义的可能。 修复：一种简单的修复是在paintComponent中加入circles为null的检测。

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Codes of my MOOC Course <Play with Algorithm Visualization>. Updated contents and more demos or practices are also included. 我在慕课网上的课程《看得见的算法》Java示例代码。课程的更多更新内容及辅助练...

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