4 files changed, 68 insertions, 4 deletions
diff --git a/java.html.markdown b/java.html.markdown
index 4f5cde38..1813f81c 100644
--- a/java.html.markdown
+++ b/java.html.markdown
@@ -697,6 +697,64 @@ public abstract class Mammal()
         return true;
     }
 }
+
+
+// Enum Type
+//
+// An enum type is a special data type that enables for a variable to be a set of predefined constants. The        // variable must be equal to one of the values that have been predefined for it.
+// Because they are constants, the names of an enum type's fields are in uppercase letters.
+// In the Java programming language, you define an enum type by using the enum keyword. For example, you would 
+// specify a days-of-the-week enum type as:
+
+public enum Day {
+    SUNDAY, MONDAY, TUESDAY, WEDNESDAY,
+    THURSDAY, FRIDAY, SATURDAY 
+}
+
+// We can use our enum Day like that:
+
+public class EnumTest {
+    
+    // Variable Enum
+    Day day;
+    
+    public EnumTest(Day day) {
+        this.day = day;
+    }
+    
+    public void tellItLikeItIs() {
+        switch (day) {
+            case MONDAY:
+                System.out.println("Mondays are bad.");
+                break;
+                    
+            case FRIDAY:
+                System.out.println("Fridays are better.");
+                break;
+                         
+            case SATURDAY: 
+            case SUNDAY:
+                System.out.println("Weekends are best.");
+                break;
+                        
+            default:
+                System.out.println("Midweek days are so-so.");
+                break;
+        }
+    }
+    
+    public static void main(String[] args) {
+        EnumTest firstDay = new EnumTest(Day.MONDAY);
+        firstDay.tellItLikeItIs(); // => Mondays are bad.
+        EnumTest thirdDay = new EnumTest(Day.WEDNESDAY);
+        thirdDay.tellItLikeItIs(); // => Midweek days are so-so.
+    }
+}
+
+// Enum types are much more powerful than we show above. 
+// The enum body can include methods and other fields.
+// You can se more at https://docs.oracle.com/javase/tutorial/java/javaOO/enum.html
+
 ```
 
 ## Further Reading
diff --git a/javascript.html.markdown b/javascript.html.markdown
index cd75b0d2..e285ca4e 100644
--- a/javascript.html.markdown
+++ b/javascript.html.markdown
@@ -101,6 +101,10 @@ false;
 // Strings are concatenated with +
 "Hello " + "world!"; // = "Hello world!"
 
+// ... which works with more than just strings
+"1, 2, " + 3; // = "1, 2, 3"
+"Hello " + ["world", "!"] // = "Hello world,!"
+
 // and are compared with < and >
 "a" < "b"; // = true
 
diff --git a/python.html.markdown b/python.html.markdown
index 753d6e8c..541bd36d 100644
--- a/python.html.markdown
+++ b/python.html.markdown
@@ -123,8 +123,12 @@ not False  # => True
 # A string can be treated like a list of characters
 "This is a string"[0]  # => 'T'
 
-# % can be used to format strings, like this:
-"%s can be %s" % ("strings", "interpolated")
+#String formatting with %
+#Even though the % string operator will be deprecated on Python 3.1 and removed 
+#later at some time, it may still be good to know how it works.
+x = 'apple'
+y = 'lemon'
+z = "The items in the basket are %s and %s" % (x,y)
 
 # A newer way to format strings is the format method.
 # This method is the preferred way
diff --git a/ru-ru/php-ru.html.markdown b/ru-ru/php-ru.html.markdown
index 5672aa90..dc254bf8 100644
--- a/ru-ru/php-ru.html.markdown
+++ b/ru-ru/php-ru.html.markdown
@@ -420,8 +420,6 @@ include_once 'my-file.php';
 require 'my-file.php';
 require_once 'my-file.php';
 
-// Same as include(), except require() will cause a fatal error if the
-// file cannot be included.
 // Действует также как и include(), но если файл не удалось подключить,
 // функция выдает фатальную ошибку