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Collections singletonMap() method in Java with Examples

Last Updated : 11 May, 2021

The singletonMap() method of java.util.Collections class is used to return an immutable map, mapping only the specified key to the specified value. The returned map is serializable.

Syntax: 

public static Map singletonMap(K key, V value)


Parameters: This method takes the following parameters as a argument: 

  • key - the sole key to be stored in the returned map.
  • value - the value to which the returned map maps key.

Return Value: This method returns an immutable map containing only the specified key-value mapping.

Below are the examples to illustrate the singletonMap() method

Example 1:  


Output: 
Singleton map is: {key=Value}

 

Example 2:


Output: 
Singleton map is: {100=true}

 
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