本文介绍CodeQL中用于分析Java程序调用图的类：Callable（可被调用的方法或构造器）和Call（调用点），以及导航谓词getCallee、getCaller和polyCalls。通过示例展示如何编写查询查找未使用的方法，并逐步优化查询，排除库代码、类初始化器、finalize方法、公共方法、默认构造器及测试类，以减少误报。

本文介绍了CodeQL在Java中的调用图分析，用户可以通过Callable和Call类识别未被调用的方法。示例查询展示了如何找到未被其他方法调用的可调用对象，并提供了排除特定方法和构造函数的策略，以减少查询结果。同时，文章提到反射调用和JUnit测试方法的特殊情况，强调了识别未使用方法的复杂性。

The Jupyter Executive Council and Jupyter Foundation are pleased to announce a new Call for Proposals (CFP) for funding the Jupyter community to improve Jupyter. Visit the Jupyter Foundation...

February 2026 Jupyter Community CallHey Jovyans, we’d love for you to join us on our final community call of the year! We want to learn all about the great things you’re doing with Jupyter. The...

Linux 系统调用是用户程序与内核交互的桥梁，确保系统的安全性和稳定性。用户程序通过系统调用请求内核服务，内核验证权限并执行特权操作。本文介绍了系统调用的定义、工作机制、分类、最佳实践及调试工具，强调错误处理和性能优化的重要性。理解系统调用有助于开发高效、健壮的程序。

December 2025 Community CallHey Jovyans, we’d love for you to join us on our final community call of the year! We want to learn all about the great things you’re doing with Jupyter. The Community...

The Jupyter Executive Council and Jupyter Foundation are pleased to announce a call for proposals for the Jupyter community. Visit the Jupyter Foundation Community Proposals webpage to learn more...

作者分享了一个N-Body模拟项目，使用环形缓冲区存储天体轨迹。最初使用DrawLine绘制时，绘制10万个点耗时50毫秒，性能瓶颈明显。改用ID2D1PathGeometry后，绘制调用次数减少，性能提升至6毫秒，优化效果显著。总结强调理解Draw Call成本和量化测试的重要性。

September 2025 Community CallHey Jovyans, we want to learn about the great things you’re doing with Jupyter! The Community Building working group is holding an open call with the community for...

June 2025 Community CallHey Jovyans, we want to learn about the great things you’re doing with Jupyter! The Diversity, Equity, and Inclusion (DEI) standing committee is holding an open call with...

Pixel手机的Call Assist功能帮助用户高效管理电话，包括识别陌生号码、过滤垃圾电话、导航自动菜单、代替等待、记录通话要点、文字回复和自动筛选来电，节省时间。