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Java Collections - Collections.singletonMap() Examples

[Last Updated: Nov 8, 2025]

Java Collections Java Java API

Class:

java.util.Collections

Method:

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

Returns an immutable map, mapping only the specified key to the specified value.

Examples

package com.logicbig.example.collections;

import java.util.Collections;
import java.util.Map;

public class SingletonMapExample {

    public static void main(String... args) {
        Map<Integer, Integer> map = Collections.singletonMap(1, 4);
        System.out.println(map);
    }
}

Output

{1=4}

See Also