Eclipse重构问询：如何为类型层级添加中间父类

Great question—this is exactly the kind of repetitive task that Eclipse’s built-in tools are designed to handle without manual drudgery. Here’s how to solve it efficiently:

1. First, Lock in Your Abstract Class #

Make sure you’ve already created org.mycompany.MySystemJob with all your shared system-specific logic, and confirmed it correctly extends org.quartz.Job. This will be the new parent for all your batch job classes.

2. Use Structural Search and Replace (SSR) for Batch Updates #

Eclipse Kepler includes SSR, a powerful tool for modifying code structures at scale. This is perfect for your use case:

• Open the search dialog with Search > Search..., then switch to the Structural Search tab.
• Click New Search, select Java as the target language.
• Paste this search template to match all classes directly extending org.quartz.Job:

  class $Class$ extends org.quartz.Job {
      // Class content (ignored by the template)
  }
  

• Click the Variables button to refine the search:
  • Select $Class$, then under Exclude Types, add org.mycompany.MySystemJob (so we don’t modify your new abstract class itself).
  • You can also add constraints like limiting to your project’s package if needed.
• Run the search to verify you’re only targeting the batch job classes you want to update.
• Switch to the Structural Replace tab, then paste this replacement template:

  class $Class$ extends org.mycompany.MySystemJob {
      // Preserves original class content
  }
  

• Click Preview to double-check all the changes that will be made. If everything looks correct, hit Replace All to update all classes in one go.

Why Extract Superclass Isn’t Ideal Here #

You’re right that the Extract Superclass refactor isn’t a good fit here—it’s designed to pull common code from existing child classes into a new parent, which requires manually selecting all sibling classes. Since you’ve already built your abstract class upfront, SSR is the far more efficient choice.

Alternative: Type Hierarchy + Batch Refactor (For Smaller Codebases) #

If you only have a handful of classes to update, this simpler method works too:

• Open the Type Hierarchy for org.quartz.Job (select the class, press F4).
• In the hierarchy view, expand the Direct Subclasses section and select all your batch job classes (hold Ctrl/Cmd to multi-select).
• Right-click the selection, then go to Refactor > Change Superclass.
• Enter org.mycompany.MySystemJob as the new superclass, confirm, and Eclipse will update all selected classes at once.

内容的提问来源于stack exchange，提问作者Brian