UUID.fromString(String) in Java

UUID.fromString(String): This method is available in java.util.UUID class of Java.

Syntax:

UUID java.util.UUID.fromString(String name)

This method takes one argument. This method creates a UUID from the string standard representation as described in the toString method.

Parameters: One parameter is required for this method.

name: A string that specifies a UUID.

Returns: A UUID with the specified value.

Throws:

IllegalArgumentException - If the name does not conform to the string representation as described in toString

Approach 1: When no exception

Java

import java.util.UUID;

public class UUIDfromString {
    public static void main(String[] args) {

        UUID uuid =
        UUID.fromString("3800-8cf0-11bd-b23e-10b96e4ef00d");

        System.out.println(uuid);
    }
}

Output:

00003800-8cf0-11bd-b23e-10b96e4ef00d

Approach 2: IllegalArgumentException

Java

import java.util.UUID;

public class UUIDfromString {
    public static void main(String[] args) {

        UUID uuid = UUID.fromString("3800-b23e-10b96e4ef00d");

        System.out.println(uuid);
    }
}

Output:

Exception in thread "main" java.lang.IllegalArgumentException: Invalid UUID string: 3800-b23e-10b96e4ef00d
	at java.base/java.util.UUID.fromString1(UUID.java:280)
	at java.base/java.util.UUID.fromString(UUID.java:258)
	

Some other methods of UUID

clockSequence(): This method returns the clock sequence value associated with this UUID.

compareTo(UUID): This method compares this UUID with the specified UUID.

equals(Object): This method compares this object to the specified object.

UUID.fromString(String): This method creates a UUID from the string standard representation as described in the toString method.

getLeastSignificantBits(): This method returns the least significant 64 bits of this UUID's 128-bit value.

getMostSignificantBits(): This method returns the most significant 64 bits of this UUID's 128-bit value.

hashCode(): This method returns a hash code for this UUID.

UUID.nameUUIDFromBytes(byte[]): Static factory to retrieve a type 3 UUID based on the specified byte array.

node(): The node value associated with this UUID.

UUID.randomUUID(): Static factory to retrieve a type 4 UUID.

timestamp(): This method returns the timestamp value associated with this UUID.

toString(): This method returns a String object representing this UUID.

variant(): This method returns the variant number associated with this UUID.

version(): This method returns the version number associated with this UUID.