Basic Operations 

The following example shows how to perform basic operation with enum. All enum types implicitly implements java.io.Serializable and java.lang.Comparable. Enum provides the following APIs,

public static <E extends Enum<E>> E[] values();
 - Returns all enum constants of this element type. 
 
public final String name()
 - Returns name of enum constant.
 
public final int ordinal()
 - Returns position in its enum declaration starting with index ZERO.
 
public static <T extends Enum<T>> T valueOf(String name) 
 - Returns the enum constant of this enum type with the specified name.
   If no match found throws IllegalArgumentException.
  
public static <T extends Enum<T>> T valueOf(Class enumType, String name) 
 - Returns the enum constant of the specified enum type with the specified name.
   If no match found throws IllegalArgumentException.   

File Name  :   com/bethecoder/tutorials/utils/enums/EnumBasicTests.java  Author  :   Sudhakar KV Email  :   [email protected]

package com.bethecoder.tutorials.utils.enums; import java.util.Arrays; public class EnumBasicTests {   /**    * @param args    */   public static void main(String[] args) {     /**      * Get all enum constants of this type as array      */     Fruit [] fruits = Fruit.values();     System.out.println(Arrays.toString(fruits));     System.out.println();          for (int i = 0 ; i < fruits.length ; i ++) {       System.out.println(fruits[i].name() + "->" + fruits[i].ordinal());     }          /**      * Get enum constant from Fruit enum class      */     System.out.println();     Fruit fruit = Fruit.valueOf("MANGO");     System.out.println(fruit);          /**      * Get enum constant from static method of Enum class      */     fruit = Enum.valueOf(Fruit.class, "APPLE");     System.out.println(fruit);     System.out.println();          //Access invalid enum constant     try {       fruit = Fruit.valueOf("MANGO_BAD");     } catch (IllegalArgumentException e) {       System.out.println(e);     }          //Access invalid enum constant     try {       fruit = Enum.valueOf(Fruit.class, "APPLE_BAD");     } catch (IllegalArgumentException e) {       System.out.println(e);     }   }    }

File Name  :   com/bethecoder/tutorials/utils/enums/Fruit.java

package com.bethecoder.tutorials.utils.enums; public enum Fruit {   APPLE,   ORANGE,   BANANA,   CHERRY,   MANGO }

[APPLE, ORANGE, BANANA, CHERRY, MANGO]

APPLE->0
ORANGE->1
BANANA->2
CHERRY->3
MANGO->4

MANGO
APPLE

java.lang.IllegalArgumentException: 
	No enum const class com.bethecoder.tutorials.utils.enums.Fruit.MANGO_BAD
java.lang.IllegalArgumentException: 
	No enum const class com.bethecoder.tutorials.utils.enums.Fruit.APPLE_BAD