diff --git a/oni-c.el b/oni-c.el
index cfa360d..bbe37c2 100644
--- a/oni-c.el
+++ b/oni-c.el
@@ -4,7 +4,7 @@
 
 ;; Author: Tom Willemse <tom@ryuslash.org>
 ;; Keywords: local
-;; Version: 2020.0907.143822
+;; Version: 2020.1210.205244
 ;; Package-Requires: (oni-flycheck oni-fci)
 
 ;; This program is free software; you can redistribute it and/or modify
@@ -26,13 +26,16 @@
 
 ;;; Code:
 
+(require 'cc-mode)
+
 (defun oni-c--auto-fill-mode ()
   "Enable ‘auto-fill-mode’ only for comments."
   (setq-local comment-auto-fill-only-comments t)
   (auto-fill-mode))
 
-(add-hook 'c-mode-hook 'electric-pair-local-mode)
+(add-hook 'c-mode-hook 'abbrev-mode)
 (add-hook 'c-mode-hook 'electric-indent-local-mode)
+(add-hook 'c-mode-hook 'electric-pair-local-mode)
 (add-hook 'c-mode-hook 'flycheck-mode)
 (add-hook 'c-mode-hook 'oni-c--auto-fill-mode)
 
@@ -41,6 +44,9 @@
               'display-fill-column-indicator-mode
             'fci-mode))
 
+(define-abbrev c-mode-abbrev-table "and" "&&")
+(define-abbrev c-mode-abbrev-table "or" "||")
+
 ;;;###autoload(with-eval-after-load 'cc-mode (require 'oni-c))
 
 (provide 'oni-c)
diff --git a/oni-csharp/oni-csharp.el b/oni-csharp/oni-csharp.el
index 370c256..13bc1cc 100644
--- a/oni-csharp/oni-csharp.el
+++ b/oni-csharp/oni-csharp.el
@@ -4,7 +4,7 @@
 
 ;; Author: Tom Willemse <tom@ryuslash.org>
 ;; Keywords: local
-;; Version: 2020.0907.151110
+;; Version: 2020.1210.205218
 ;; Package-Requires: (csharp-mode oni-company oni-flycheck oni-yasnippet oni-hydra oni-fci oni-lsp smartparens)
 
 ;; This program is free software; you can redistribute it and/or modify
@@ -142,6 +142,7 @@ _cs_: Solution
   "Set style rules according to personal (or recommended) preference."
   (setf (alist-get 'arglist-intro c-offsets-alist) '+))
 
+(add-hook 'csharp-mode-hook 'abbrev-mode)
 (add-hook 'csharp-mode-hook 'company-mode)
 (add-hook 'csharp-mode-hook 'electric-indent-local-mode)
 (add-hook 'csharp-mode-hook 'flycheck-mode)
@@ -158,6 +159,9 @@ _cs_: Solution
 
 (define-key csharp-mode-map (kbd "C-c SPC") 'oni-csharp-hydra/body)
 
+(define-abbrev csharp-mode-abbrev-table "and" "&&")
+(define-abbrev csharp-mode-abbrev-table "or" "||")
+
 ;;;###autoload
 (add-to-list 'auto-mode-alist '("\\.xaml\\'" . nxml-mode))
 
diff --git a/oni-java.el b/oni-java.el
index ec62205..e1a995f 100644
--- a/oni-java.el
+++ b/oni-java.el
@@ -4,7 +4,7 @@
 
 ;; Author: Tom Willemse <tom@ryuslash.org>
 ;; Keywords: local
-;; Version: 2020.1030.182339
+;; Version: 2020.1210.205100
 ;; Package-Requires: (oni-fci oni-data-dir oni-lsp oni-hydra lsp-java)
 
 ;; This program is free software; you can redistribute it and/or modify
@@ -69,6 +69,7 @@
 
 (add-hook 'java-mode-hook #'oni-java-enable-buffer-formatting)
 (add-hook 'java-mode-hook #'oni-java-only-fill-comments)
+(add-hook 'java-mode-hook 'abbrev-mode)
 (add-hook 'java-mode-hook 'auto-fill-mode)
 (add-hook 'java-mode-hook 'electric-indent-local-mode)
 (add-hook 'java-mode-hook 'electric-pair-local-mode)
@@ -82,6 +83,9 @@
 (define-key java-mode-map (kbd "C-c r") 'java-refactor-hydra/body)
 (define-key java-mode-map (kbd "C-c d") 'java-documentation-hydra/body)
 
+(define-abbrev java-mode-abbrev-table "and" "&&")
+(define-abbrev java-mode-abbrev-table "or" "||")
+
 (add-to-list 'auto-insert-alist
              '("\\.java\\'"
                () "public class "