java.util.Collections.singletonMap() Method

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Description

The singletonMap(K, V) method is used to get an immutable map, mapping only the specified key to the specified value.

Declaration

Following is the declaration for java.util.Collections.singletonMap() method.

public static <K,V> Map<K,V> singletonMap(K key,V value)

Parameters

• key − The sole key to be stored in the returned map.

• value − Tthe value to which the returned map maps key./p>

Return Value

The method call returns an immutable map containing only the specified key-value mapping.

Exception

NA

Example

The following example shows the usage of java.util.Collections.singletonMap()

package com.tutorialspoint;

import java.util.*;

public class CollectionsDemo {
   public static void main(String[] a) {
      
      // create singleton map
      Map map = Collections.singletonMap("key","Value");

      System.out.println("Singleton map is: "+map);
   }
}

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

Singleton map is: {key=Value}