Friday, October 12, 2012

Eclipse shortcut to remove all unused imports in Java file

How to remove all unused imports in Eclipse
Eclipse IDE gives warning "The import XXX is never used" whenever it detect unused import in Java source file and shows a yellow underline. Though unused import in Java file does not create any harm, it's unnecessary increase length and size of Java source file and if you have too many unused imports in your Java source file, those yellow underline and Eclipse warning affect readability and working. In our last post on Eclipse, we have seen dome Java debugging tips on Eclipse and in this post we will see Eclipse shortcut to remove all unused imports in Eclipse. There are many options to tackle this problem e.g. you can collapse import section of code in Eclipse or you can altogether remove all unused imports from Java file. Since Eclipse is favorite IDE of many Java programmer, who love to do things fast in shortcuts, I will also share Eclipse shortcut to remove unused imports from Java program in this article. This is one of many Eclipse shortcuts which we have discussed in our post Top 30 Eclipse keyboard shortcut for Java programmer. Let's see How to remove all unused imports from Java file in Eclipse IDE.

How to remove all unused imports from Java file in Eclipse

How to remove all unused imports in Eclipse from Java File
Yellow underline on above pic denotes all unused imports in a Java Source file
Here is couple of ways to remove all unused imports from Java in Eclipse IDE :

1) Go to the line of unused import, press ctrl + 1 which is an eclipse shortcut of a quick fix, this will show a drop down menu to fix this error and one of them would be "remove unused imports" and it will remove that import statement from Java file.

2) Above option is not very efficient if you want to remove multiple unused imports in single click because it removes them one by one. It's better to use "Organize Imports" feature of Eclipse IDE to remove multiple or all unused imports statement. For using this from Menu, Select Source-->Organize Imports. This will remove all unused imports from that Java file.

3) Third and my preferred option to remove all unused import statement from Java file is ctrl + shift + O, which is a shortcut of Organized import in Eclipse and you can say Eclipse shortcut to remove all unused import statement from Java file. This will also work with the previous option and remove all unused import lines from the source file.

Do you want a bonus Eclipse tips ? If yes then here you go, you can save all keystrokes required to remove all unused imports from Java source file by using Eclipse save actions, which are actions Eclipse automatically perform when you save Java file. Just check the option of Organized imports in save action under Window-->Preferences->Java-->Editor-->Save Actions. This saves heap lot of time while working in Eclipse and one of the reasons I love Eclipse IDE for Java programming. You can also configure formatting and few other action which will be taken by Eclipse automatically whenever you save you file.

One more advantage of using Organize import or shortcut ctrl + shift +O is that it imports all packages which are required by code, So it not only save time while removing import statement but also help to import required packages in Java. It means if you copy paste some code and see lots of red line as an error due to non-imported packages, just use this Eclipse shortcut or save your source file if you have configured Eclipse save action to organize import.

That's all on Eclipse shortcut of removing all unused import statement from Java source file in Eclipse IDE. It's always good to learn more about IDE on which you are working e.g. Netbeans or Eclipse to improve productivity.

Further Learning
The Eclipse Guided Tour - Part 1 and 2
Java Fundamentals, Part 1 and 2
The Java Developer's Guide to Eclipse

Other Java Eclipse articles you may like to explore
  • 30 Useful Eclipse Shortcuts for Java Developers (list)
  • How to remote debug Java application in Eclipse? (tutorial)
  • 10 Eclipse debugging tips Java developer should know? (see here)
  • How to attach source code for JAR file in Eclipse? (guide)
  • Eclipse shortcut to print System.out.println statements? (shortcut)
  • How to increase console buffer size in Eclipse? (steps)
  • How to use spaces instead of tabs in Eclipse? (guide)
  • How to create an executable JAR file from Eclipse? (example)
  • 3 Books to Learn Eclipse IDE for Java developers (list)
  • How to Increase Heap Size of Java Program running in Eclipse? (guide)

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