Java EnumSet of() Method

Description

The Java EnumSet of(E e) method creates an enum set initially containing the specified element.

Declaration

Following is the declaration for java.util.EnumSet.of() method

public static <E extends Enum<E>> EnumSet<E> of(E e)

Parameters

e − the element that this set is to contain initially.

Return Value

This method returns an enum set initially containing the specified element.

Exception

NullPointerException − if e is null

Java EnumSet of(E first, E... rest) Method

Description

The java.util.EnumSet.of(E first, E... rest) method creates an enum set initially containing the specified elements. This factory, whose parameter list uses the varargs feature, may be used to create an enum set initially containing an arbitrary number of elements, but it is likely to run slower than the overloadings that do not use varargs.

Declaration

Following is the declaration for java.util.EnumSet.of(E first, E... rest) method

public static <E extends Enum<E>> EnumSet<E> of(E first, E... rest)

Parameters

  • first − an element that the set is to contain initially.

  • rest − the remaining elements the set is to contain initially.

Return Value

This method returns an enum set initially containing the specified elements.

Exception

NullPointerException − if e is null

Java EnumSet of(E e1, E e2) Method

Description

The java.util.EnumSet.of(E e1,E e2) method creates an enum set initially containing the two specified elements.

Declaration

Following is the declaration for java.util.EnumSet.of(E e1,E e2) method

public static <E extends Enum<E>> EnumSet<E> of(E e1,E e2)

Parameters

  • e1 − the element that this set is to contain initially.

  • e2 − another element that this set is to contain initially.

Return Value

This method returns an enum set initially containing the specified elements.

Exception

NullPointerException − if any of parameters is null

Java EnumSet of(E e1, E e2, E e3) Method

Description

The java.util.EnumSet.of(E e1,E e2,E e3) method creates an enum set initially containing the three specified elements.

Declaration

Following is the declaration for java.util.EnumSet.of(E e1,E e2,E e3) method

public static <E extends Enum<E>> EnumSet<E> of(E e1,E e2,E e3)

Parameters

  • e1 − the element that this set is to contain initially.

  • e2 − another element that this set is to contain initially.

  • e3 − another element that this set is to contain initially.

Return Value

This method returns an enum set initially containing the specified elements.

Exception

NullPointerException − if any of parameters is null

Java EnumSet of(E e1, E e2, E e3, E e4) Method

Description

The java.util.EnumSet.of(E e1,E e2,E e3,E e4) method creates an enum set initially containing the four specified elements.

Declaration

Following is the declaration for java.util.EnumSet.of(E e1,E e2,E e3,E e4) method

public static <E extends Enum<E>> EnumSet<E> of(E e1,E e2,E e3,E e4)

Parameters

  • e1 − the element that this set is to contain initially.

  • e2 − another element that this set is to contain initially.

  • e3 − another element that this set is to contain initially.

  • e4 − another element that this set is to contain initially.

Return Value

This method returns an enum set initially containing the specified elements.

Exception

NullPointerException − if any of parameters is null

Java EnumSet of(E e1, E e2, E e3, E e4, E e5) Method

Description

The java.util.EnumSet.of(E e1,E e2,E e3,E e4,E e5) method creates an enum set initially containing the five specified elements.

Declaration

Following is the declaration for java.util.EnumSet.of(E e1,E e2,E e3,E e4,E e5) method

public static <E extends Enum<E>> EnumSet<E> of(E e1,E e2,E e3,E e4,E e5)

Parameters

  • e1 − the element that this set is to contain initially.

  • e2 − another element that this set is to contain initially.

  • e3 − another element that this set is to contain initially.

  • e4 − another element that this set is to contain initially.

  • e5 − another element that this set is to contain initially.

Return Value

This method returns an enum set initially containing the specified elements.

Exception

NullPointerException − if any of parameters is null

Creating EnumSet using One Enum Value Example

The following example shows the usage of Java EnumSet of(E) method to populate the EnumSet instance. We've created a enum Numbers. Then a EnumSet instance is created using a enum value 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 a set that contains an enum
      EnumSet<Numbers> set = EnumSet.of(Numbers.ONE);

      // print set
      System.out.println("Set:" + set);
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Set:[ONE]

Creating EnumSet using Multiple Enum Values Example

The following example shows the usage of Java EnumSet of(E, E...) method to populate the EnumSet instance. We've created a enum Numbers. Then a EnumSet instance is created using a enum value and an array of enums 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 array
      Numbers[] numbers = {Numbers.TWO, Numbers.THREE};
      // create a set that contains all of enum and array of enums
      EnumSet<Numbers> set = EnumSet.of(Numbers.ONE, numbers);

      // print set
      System.out.println("Set:" + set);
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Set:[ONE, TWO, THREE]

Creating EnumSet using Two Enum Values Example

The following example shows the usage of Java EnumSet of(E, E) method to populate the EnumSet instance using two enum values. We've created a enum Numbers. Then a EnumSet instance is created using two enums 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 a set that contains both enums
      EnumSet<Numbers> set = EnumSet.of(Numbers.ONE, Numbers.TWO);

      // print set
      System.out.println("Set:" + set);
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Set:[ONE, TWO]

Creating EnumSet using Three Enum Values Example

The following example shows the usage of Java EnumSet of(E, E, E) method to populate the EnumSet instance using three enum values. We've created a enum Numbers. Then a EnumSet instance is created using three enums 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 a set that contains three enums
      EnumSet<Numbers> set = EnumSet.of(Numbers.ONE, Numbers.TWO, Numbers.THREE );

      // print set
      System.out.println("Set:" + set);
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Set:[ONE, TWO, THREE]

Creating EnumSet using Four Enum Values Example

The following example shows the usage of Java EnumSet of(E, E, E, E) method to populate the EnumSet instance using four enum values. We've created a enum Numbers. Then a EnumSet instance is created using four enums 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 a set that contains four enums
      EnumSet<Numbers> set = EnumSet.of(Numbers.ONE, Numbers.TWO, Numbers.THREE, Numbers.FOUR );

      // print set
      System.out.println("Set:" + set);
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Set:[ONE, TWO, THREE, FOUR]

Creating EnumSet using Five Enum Values Example

The following example shows the usage of Java EnumSet of(E, E, E, E, E) method to populate the EnumSet instance using five enum values. We've created a enum Numbers. Then a EnumSet instance is created using five enums 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 a set that contains five enums
      EnumSet<Numbers> set = EnumSet.of(Numbers.ONE, Numbers.TWO, Numbers.THREE, Numbers.FOUR, Numbers.FIVE);

      // print set
      System.out.println("Set:" + set);
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Set:[ONE, TWO, THREE, FOUR, FIVE]
java_util_enumset.htm
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