Initialize a static Map using Java 9 Map.of()
Last Updated :
12 Jul, 2025
In this article, a
static map is created and initialised in Java using Java 9.
Static Map in Java
A
static map is a map which is defined as
static. It means that the map becomes a class member and can be easily used using class.
Java 9 feature - Map.of() method
In
Java 9, Map.of() was introduced which is a convenient way to create instances of Map interface. It can hold up to 10 key-value pairs.
Approach:
- Pass the map values as Key and Value pair in the Map.of() method.
- A static factory Map instance is returned.
- Store it in Map and use.
Below is the implementation of the above approach:
Example 1:
Java
// Java program to create a static map using Java 9
import java.util.*;
class GFG {
// Declaring and instantiating the static map
private static Map<String, String> map
= Map.of("1", "GFG",
"2", "Geek",
"3", "GeeksForGeeks");
// Driver code
public static void main(String[] args)
{
System.out.println(map);
}
}
{3=GeeksForGeeks, 2=Geek, 1=GFG}
Example 2: To show the error when 10 key-value pairs are given
Java
// Java program to create a static map using Java 9
import java.util.*;
class GFG {
// Declaring and instantiating the static map
private static Map<String, String> map
= Map.of("1", "GFG",
"2", "Geek",
"3", "GeeksForGeeks",
"4", "G",
"5", "e",
"6", "e",
"7", "k",
"8", "s",
"9", "f",
"10", "o");
// Driver code
public static void main(String[] args)
{
System.out.println(map);
}
}
{10=o, 9=f, 8=s, 7=k, 6=e, 5=e, 4=G, 3=GeeksForGeeks, 2=Geek, 1=GFG}
Example 3: To show the error when more than 10 key-value pairs are given
Java
// Java program to create a static map using Java 9
import java.util.*;
class GFG {
// Declaring and instantiating the static map
private static Map<String, String> map
= Map.of("1", "GFG",
"2", "Geek",
"3", "GeeksForGeeks",
"4", "G",
"5", "e",
"6", "e",
"7", "k",
"8", "s",
"9", "f",
"10", "o",
"11", "r");
// Driver code
public static void main(String[] args)
{
System.out.println(map);
}
}
Main.java:12: error: no suitable method found for
of(String, String,
String, String,
String, String,
String, String,
String, String,
String, String,
String, String,
String, String,
String, String,
String, String,
String, String)
1 error
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