Eclipse不支持原生地在大规模代码块（if、while、switch）上进行折叠。但是，有各种插件可供选择。其中一个插件可以在这里找到：http://kosiara87.blogspot.de/2011/12/how-to-install-coffee-bytes-plugin-in.html。这个插件特别适用于Indigo版本的Eclipse。

To fold code blocks in Eclipse, you can use a plugin called Coffee-Bytes. Here's how to install it:

1. Download the Coffee-Bytes plugin from the provided link.

2. Open Eclipse and go to Help > Eclipse Marketplace.

3. In the Eclipse Marketplace window, type "Coffee-Bytes" in the search bar.

4. Click on the Coffee-Bytes plugin in the search results.

5. Click the "Go to installation page" button.

6. Follow the instructions on the installation page to download and install the plugin.

7. Restart Eclipse to apply the changes.

Once the Coffee-Bytes plugin is installed, you can start folding code blocks in Eclipse. Here's how to do it:

1. Open a Java file in Eclipse.

2. Locate the code block that you want to fold, such as an if statement or a while loop.

3. Place the cursor at the beginning or end of the code block.

4. Right-click and select "Fold" from the context menu.

5. The code block will be collapsed, and you can click on the arrow next to it to expand or collapse it as needed.

Note that the Coffee-Bytes plugin also supports other features like code highlighting and code metrics. You can explore these features by referring to the plugin documentation.

That's it! Now you can easily fold code blocks in Eclipse using the Coffee-Bytes plugin. Enjoy coding with improved readability and organization!