Save action in Eclipse IDE to convert the java code to the diamond notation

Question

If you have a java version >= 1.7 you can use the diamond notation.

Instead of:

List<String> rows = new ArrayList<String>();

You can write:

List<String> rows = new ArrayList<>();

With Eclipse Mars-M4, I have errors when I use the first construct. (Maybe this was already the case with Eclipse Luna version. I did not check):

This is due to this configuration:

Preferences > Java > Compiler > Errors/Warnings in the tree. In the list: Generic Types > Redundant type arguments (1.7 or higher).

This is set to ERROR. I can of course configure it to IGNORE to remove the error.

I am searching for another solution. Eclipse has the notion of “Additional actions”. I am looking for an action that would rewrite the code to the diamond notation.

Does this action already exist? How can I configure it?

Related question:

• Convert existing generics to diamond syntax (but this is in NetBeans).

Answer 1

With Eclipse Neon, just select "Remove redundant type arguments (1.7 or higher)" under the "Unnecessary Code" tab in the "Additional Save Actions" windows (or in the "Edit Clean-up Profile" windows).

Read more in this blog post: Eclipse Neon: diamond notation as clean-up action