<code> tags in Javadoc comments. Since JDK 1.5, these constructs can be replaced with {@code ...} constructs. This allows using angle brackets < and > inside the comment instead of HTML character entities.
Example:
/**
* @return empty <code>ArrayList<Integer></code>
*/
List<Integer> getList(){ ... }
After the quick-fix is applied:
/**
* @return empty {@code ArrayList<Integer>}
*/
List<Integer> getList(){ ... }