### Generate UUIDs using JUG CLI

Source: https://github.com/cowtowncoder/java-uuid-generator/blob/main/README.md

Illustrates how to use the JUG JAR file as a command-line tool to generate UUIDs. This example shows generating 5 random-based UUIDs.

```bash
java -jar target/java-uuid-generator-5.1.0-SNAPSHOT.jar -c 5 r
```

--------------------------------

### Construct UUID from String (JDK)

Source: https://github.com/cowtowncoder/java-uuid-generator/blob/main/README.md

Shows the standard JDK method for constructing a `java.util.UUID` from a String. Note that JUG's `UUIDUtil.uuid(String)` is generally faster.

```java
UUID uuidFromStr = UUID.fromString("ebb8e8fe-b1b1-11d7-8adb-00b0d078fa18");
```

--------------------------------

### Customize and Reuse Time-Based Generator

Source: https://github.com/cowtowncoder/java-uuid-generator/blob/main/README.md

Shows how to create a custom time-based UUID generator instance, potentially configured with a specific network interface, and reuse it for multiple generations.

```java
TimeBasedGenerator gen = Generators.timeBasedGenerator(EthernetAddress.fromInterface());
UUID uuid = gen.generate();
UUID anotherUuid = gen.generate();
```

--------------------------------

### Generate UUIDs using JUG CLI (older versions)

Source: https://github.com/cowtowncoder/java-uuid-generator/blob/main/README.md

Provides the command-line invocation for older JUG versions (prior to 4.1) where the JAR metadata did not specify a 'Main-Class', requiring explicit class path usage.

```bash
java -cp target/java-uuid-generator-5.1.0-SNAPSHOT.jar com.fasterxml.uuid.Jug -c 5 r
```

--------------------------------

### Generate Various UUID Versions

Source: https://github.com/cowtowncoder/java-uuid-generator/blob/main/README.md

Demonstrates generating different versions of UUIDs using the JUG library. Supports time-based (v1, v6, v7), random-based (v4), and name-based (v5) generators.

```java
UUID uuid = Generators.timeBasedGenerator().generate(); // Version 1
UUID uuid = Generators.randomBasedGenerator().generate(); // Version 4
UUID uuid = Generators.nameBasedGenerator().generate("string to hash"); // Version 5
// With JUG 4.1+: support for https://github.com/uuid6/uuid6-ietf-draft versions 6 and 7:
UUID uuid = Generators.timeBasedReorderedGenerator().generate(); // Version 6
UUID uuid = Generators.timeBasedEpochGenerator().generate(); // Version 7
// With JUG 5.0 added variation:
UUID uuid = Generators.timeBasedEpochRandomGenerator().generate(); // Version 7 with per-call random values
```

--------------------------------

### Construct UUID from String and Byte Array

Source: https://github.com/cowtowncoder/java-uuid-generator/blob/main/README.md

Demonstrates using `UUIDUtil` for efficient conversion of String and byte array representations into `java.util.UUID` objects. This is an optimized alternative to `java.util.UUID.fromString()`.

```java
UUID uuidFromStr = UUIDUtil.uuid("ebb8e8fe-b1b1-11d7-8adb-00b0d078fa18");
byte[] rawUuidBytes = ...; // byte array with 16 bytes
UUID uuidFromBytes = UUIDUtil.uuid(rawUuidBytes)
```

--------------------------------

### Use Default Time-Based Generator

Source: https://github.com/cowtowncoder/java-uuid-generator/blob/main/README.md

Illustrates using the `defaultTimeBasedGenerator` factory method, which attempts to automatically detect the default network interface for creating a Version 1 UUID generator. This is suitable for common usage scenarios.

```java
TimeBasedGenerator gen = Generators.defaultTimeBasedGenerator();
UUID uuid = gen.generate();
UUID anotherUuid = gen.generate();
```

--------------------------------

### UUID Comparison Issue in JDK

Source: https://github.com/cowtowncoder/java-uuid-generator/blob/main/README.md

Illustrates the flawed `compareTo()` implementation in JDK's `java.util.UUID` which uses naive 64-bit comparison, leading to incorrect ordering for unsigned values. Always use an external comparator like `com.fasterxml.uuid.UUIDComparator` for correct unsigned or lexicographical sorting.

```text
7f905a0b-bb6e-11e3-9e8f-000000000000
8028f08c-bb6e-11e3-9e8f-000000000000
```

--------------------------------

### Convert UUID to Byte Array

Source: https://github.com/cowtowncoder/java-uuid-generator/blob/main/README.md

Provides methods for converting a `java.util.UUID` object into a byte array. This is useful for external serialization or when a byte representation is required.

```java
byte[] asBytes = UUIDUtil.asByteArray(uuid);
// or if you have longer buffer already
byte[] outputBuffer = new byte[1000];
// append at position #100
UUIDUtil.toByteArray(uuid, outputBuffer, 100);
```

--------------------------------

### Gradle Dependency for Java UUID Generator

Source: https://github.com/cowtowncoder/java-uuid-generator/blob/main/README.md

Include this line in your Gradle build file to add the Java UUID Generator library.

```groovy
implementation 'com.fasterxml.uuid:java-uuid-generator:5.1.0'
```

--------------------------------

### Maven Dependency for Java UUID Generator

Source: https://github.com/cowtowncoder/java-uuid-generator/blob/main/README.md

Add this dependency to your Maven project to include the Java UUID Generator library.

```xml
<dependency>
  <groupId>com.fasterxml.uuid</groupId>
  <artifactId>java-uuid-generator</artifactId>
  <version>5.1.0</version>
</dependency>
```

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