singletonList()

Java Collections singletonList() Method

Last Updated : 17 Mar 2025

The singletonList() method of Java Collections class is used to get an immutable list which contains only the specified object.

Syntax

Following is the declaration of singletonList() method:

Parameter

Parameter	Description	Required/Optional
o	It is the object which will be stored in the returned List.	Required

Returns

The singletonList() method returns an immutable List which contains only the specified object.

Exceptions

Compatibility Version

Java 1.3 and above

Example 1

Output:

Number List elements: [10]
String List elements: [Hello India]

Example 2

Output:

List value before: [One, Two, Three, One, Two, Three, TpointTech]
List value after: [One]

Example 3

Output:

1.	Enter the value: 55
Output: [55]
2.	Enter the value: Java
Exception in thread "main" java.util.InputMismatchException
	at java.base/java.util.Scanner.throwFor(Scanner.java:939)
	at java.base/java.util.Scanner.next(Scanner.java:1594)
	at java.base/java.util.Scanner.nextInt(Scanner.java:2258)
	at java.base/java.util.Scanner.nextInt(Scanner.java:2212)
at myPackage.CollectionsSingletonListExample3.main(CollectionsSingletonListExample3.java:7)

Next TopicJava Collections Class

← prev next →