编程新手：如何在Eclipse/PyCharm查看Java/Python内部代码实现及快捷键？

Absolutely! Diving into the source code of core classes and methods is hands down one of the best ways to truly grasp how Java and Python work—way more insightful than just reading documentation alone. Let me break down exactly how to do this in both Eclipse and PyCharm, plus the key shortcuts you’ll want to memorize:

First off, you’ll need to make sure you have the JDK source code installed (Eclipse usually prompts you to download it automatically if it’s missing, but here’s how to set it up manually if needed):

• Go to Window > Preferences > Java > Installed JREs
• Select your active JRE, click Edit, then either add the path to your JDK’s src.zip file, or click the Download button to fetch the official source code directly.

Once that’s sorted, use these shortcuts to access source code:

• Jump directly to a class/method definition: Press F3 while your cursor is on the class/method name, or hold Ctrl and left-click the name (this is the most intuitive and commonly used method).
• Quick preview without jumping: Hold Ctrl + Shift and left-click the class/method name—this opens a small pop-up window showing the source code, so you don’t have to leave your current file.
• Search for definitions: If you’re not sure where a class is defined, press Alt + F3 with the cursor on the name, then select the correct entry from the search results to jump to it.

Python’s standard library source code is included by default with most full Python interpreters, so as long as you’ve configured PyCharm to use a complete interpreter (not a stripped-down version), you’re good to go. Here are the key shortcuts:

• Jump to definition: Hold Ctrl (Windows/Linux) or Cmd (Mac) and left-click the class/method name, or press F12 while your cursor is on the name.
• Quick source preview: Hold Ctrl (Windows/Linux) or Cmd (Mac) and hover over the class/method name—PyCharm will show a pop-up with the relevant source code snippet. For a larger preview window, press Ctrl + Shift + I (Windows/Linux) or Cmd + Shift + I (Mac).
• Navigate back: After jumping to source code, press Alt + Left Arrow (Windows/Linux) or Cmd + Left Arrow (Mac) to return to your original file.

A quick tip: If PyCharm ever says it can’t find the source code, double-check your interpreter configuration (File > Settings > Project: [Your Project Name] > Python Interpreter) to make sure you’re using a full, official Python installation (not a virtual environment that’s missing standard library sources).

As a new programmer, spending time exploring these core sources will teach you so much about how languages handle things like collections, loops, and object-oriented principles—way better than just reading descriptions. Happy exploring!

内容的提问来源于stack exchange，提问作者elixir