Use forEach where possible.

common/src/com/dmdirc/parser/common/CallbackManager.java

      * @param o instance of ICallbackInterface to remove.
      */
     public void delAllCallback(final CallbackInterface o) {
-        for (CallbackObject cb : callbackHash.values()) {
-            if (cb != null && cb.getType().isInstance(o)) {
-                cb.del(o);
-            }
-        }
+        callbackHash.values().stream()
+                .filter(cb -> cb != null && cb.getType().isInstance(o))
+                .forEach(cb -> cb.del(o));
     }
 
     /**
      * @param o instance of ICallbackInterface to add.
      */
     public void addAllCallback(final CallbackInterface o) {
-        for (CallbackObject cb : callbackHash.values()) {
-            if (cb != null && cb.getType().isInstance(o)) {
-                cb.add(o);
-            }
-        }
+        callbackHash.values().stream()
+                .filter(cb -> cb != null && cb.getType().isInstance(o))
+                .forEach(cb -> cb.add(o));
     }
 
     /**

common/src/com/dmdirc/parser/common/IgnoreList.java

 import java.util.ArrayList;
 import java.util.List;
 import java.util.regex.PatternSyntaxException;
+import java.util.stream.Collectors;
 
 /**
  * Parser Ignore list.
      * @throws UnsupportedOperationException if an expression can't be converted
      */
     public List<String> getSimpleList() throws UnsupportedOperationException {
-        final List<String> res = new ArrayList<>();
-
-        for (String regex : ignoreInfo) {
-            res.add(regexToSimple(regex));
-        }
-
-        return res;
+        return ignoreInfo.stream().map(IgnoreList::regexToSimple).collect(Collectors.toList());
     }
 
     /**