Adding Enum examples

advanced_java/enum/Day.java

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+public enum Day {
+    SUNDAY, MONDAY, TUESDAY, WEDNESDAY,
+    THURSDAY, FRIDAY, SATURDAY 
+}

advanced_java/enum/Readme.md

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+# About Repository
+This repository contains the *Enum class* in Java, with examples. Enum is short for "enumerations", which means "specifically listed".<br><br>
+An enum is a special "class" that represents a group of constants (unchangeable variables, like final variables). To create an enum, use the enum keyword (instead of class or interface), and separate the constants with a comma. *Note* that they should be in uppercase letters.
+
+## About files
+1. [Day.java][1] : Contains the enum class used in all other files (test class).
+1. [inBuiltFunc.java][6] : Showcases built-in Enum methods in Java.
+1. [dotSyntax.java][2] : Access enum constants with the dot syntax.
+1. [enumInsideClass.java][3] : Having enum inside another class.
+1. [enumLoop.java][4] : Returning an array of all enum constants using value() method of enum type.This method is useful when you want to loop through the constants of an enum.
+1. [switchCase.java][5] : Using enum in switch case statement.
+
+[1]:https://github.com/Tawishi/datastructures/blob/enum-java/advanced_java/enum/Day.java
+[2]:https://github.com/Tawishi/datastructures/blob/enum-java/advanced_java/enum/dotSyntax.java
+[3]:https://github.com/Tawishi/datastructures/blob/enum-java/advanced_java/enum/enumInsideClass.java
+[4]:https://github.com/Tawishi/datastructures/blob/enum-java/advanced_java/enum/enumLoop.java
+[5]:https://github.com/Tawishi/datastructures/blob/enum-java/advanced_java/enum/switchCase.java
+[6]:https://github.com/Tawishi/datastructures/blob/enum-java/advanced_java/enum/inBuiltFunc.java

advanced_java/enum/dotSyntax.java

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+public class dotSyntax {
+  public static void main(String[] args) {
+    Day variable = Day.TUESDAY
+    System.out.println(variable);
+ }
+}

advanced_java/enum/enumInsideClass.java

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+public class enumInsideClass {
+ public static void main(String[] args) {
+    Day myVar = Day.SUNDAY; 
+    System.out.println(myVar);
+  }
+}

advanced_java/enum/enumLoop.java

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+public class enumLoop { 
+  public static void main(String[] args) { 
+    for (Day myVar : Day.values()) {
+      System.out.println(myVar);
+    }
+  } 
+}

advanced_java/enum/inBuiltFunc.java

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+enum Day {
+  MONDAY("Start!"), TUESDAY("Still going."), WEDNESDAY("Still going."), THURSDAY("Almost done."), FRIDAY("Done!"), SATURDAY("FUNday!")
+}
+
+//ordinal() method
+      public class EnumOrdinalExample 
+{ 
+    public static void main(String[] args) 
+    { 
+        // Calling values() 
+        Day arr[] = Day.values(); 
+
+        // enum with loop 
+        for (Day day : arr) 
+        { 
+            // Calling ordinal() to find index of color. 
+            System.out.println(day + " at index "
+                             + day.ordinal()); 
+        } 
+
+// Using valueOf(). Returns an object of Day with given constant. 
+// Uncommenting second line causes exception IllegalArgumentException 
+        System.out.println(Day.valueOf("WEDNESDAY")); 
+        // System.out.println(Color.valueOf("SUNDAY")); 
+    } 
+} 

advanced_java/enum/switchCase.java

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+public class switchCase {
+  public static void main(String[] args) {
+    Day myVar = Day.WEDNESDAY;
+
+    switch(myVar) {
+      case MONDAY:
+        System.out.println("Workday.");
+        break;
+      case TUESDAY:
+         System.out.println("Presentation day.");
+        break;
+      case WEDNESDAY:
+        System.out.println("Workday.");
+        break;
+      case THURSDAY:
+        System.out.println("Workday.");
+        break;
+      case FRIDAY:
+        System.out.println("PARTY!");
+        break;
+      case SATURDAY:
+        System.out.println("Relax.");
+        break;
+      case SUNDAY:
+        System.out.println("Complete deadlines.");
+        break;
+    }
+  }
+}