- Java.util Package Classes
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- Java.util - HashMap
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- Java.util - IdentityHashMap
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- Java.util - ListResourceBundle
- Java.util - Locale
- Java.util - Observable
- Java.util - PriorityQueue
- Java.util - Properties
- Java.util - PropertyPermission
- Java.util - PropertyResourceBundle
- Java.util - Random
- Java.util - ResourceBundle
- Java.util - ResourceBundle.Control
- Java.util - Scanner
- Java.util - ServiceLoader
- Java.util - SimpleTimeZone
- Java.util - Stack
- Java.util - StringTokenizer
- Java.util - Timer
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- Java.util - TimeZone
- Java.util - TreeMap
- Java.util - TreeSet
- Java.util - UUID
- Java.util - Vector
- Java.util - WeakHashMap
- Java.util Package Extras
- Java.util - Interfaces
- Java.util - Exceptions
- Java.util - Enumerations
- Java.util Useful Resources
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- Java.util - Discussion
Java EnumSet allOf() Method
Description
The java.util.EnumSet.allOf(Class<E> elementType) method creates an enum set containing all of the elements in the specified element type.
Declaration
Following is the declaration for java.util.EnumSet.allOf() method
public static <E extends Enum<E>> EnumSet<E> allOf(Class<E> elementType)
Parameters
elementType − the class object of the element type for this enum set
Return Value
This method does not return a value.
Exception
NullPointerException − if elementType is null
Creating Enumset from All Values of an Enum Example
The following example shows the usage of Java EnumSet allOf() method to populate the EnumSet instance. We've created a enum Numbers. Then a EnumSet instance is created. Using allOf() method, enumSet is populated with values of enum and resulted enumSet is printed.
package com.tutorialspoint; import java.util.EnumSet; public class EnumSetDemo { // create an enum public enum Numbers { ONE, TWO, THREE, FOUR, FIVE }; public static void main(String[] args) { // create an empty EnumSet EnumSet<Numbers> set = null; // print the set System.out.println(set); // create the set by getting all elements from Numbers set = EnumSet.allOf(Numbers.class); // print the updated set System.out.println("Updated set:" + set); } }
Output
Let us compile and run the above program, this will produce the following result −
null Updated set:[ONE, TWO, THREE, FOUR, FIVE]
Creating Enumset from All Values of an Enum with Value Example
The following example shows the usage of Java EnumSet allOf() method to populate the EnumSet instance. We've created a enum Numbers which accepts a value to be assigned to the enum. Then a EnumSet instance is created. Using allOf() method, enumSet is populated with values of enum and resulted enumSet is printed.
package com.tutorialspoint; import java.util.EnumSet; public class EnumSetDemo { // create an enum public enum Number { ONE("1"), TWO("2"), THREE("3"), FOUR("4"), FIVE("5"); // instance variable for enum private String value; public String getValue() { return this.value; } // constructor should be private or protected private Number(String value) { this.value = value; } @Override public String toString() { return this.name() +"(" + this.value + ")"; } }; public static void main(String[] args) { // create an empty EnumSet EnumSet<Number> set = null; // create the set by getting all elements from Numbers set = EnumSet.allOf(Number.class); // print the updated set System.out.println("Updated set:" + set); } }
Output
Let us compile and run the above program, this will produce the following result −
Updated set:[ONE(1), TWO(2), THREE(3), FOUR(4), FIVE(5)]
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