Added: UUID generator snippet #248

248: updated formatting

248: updated formatting

Author: SP

README.md

@@ -2336,6 +2336,36 @@ public class FormatBytesSnippet {
 }
 ```
 
+### UUID Generator
+```java
+public class UuidGeneratorSnippet {
+
+    /**
+    * Generates a random UUID (version 4).
+    *
+    * @return A string representation of a UUID.
+    */
+    public static String generateUUID() {
+        return UUID.randomUUID().toString();
+    }
+
+    /**
+     * Validates if a string is a valid UUID.
+     *
+     * @param input the string to validate
+     * @return true if valid UUID, false otherwise
+     */
+    public static boolean isValidUUID(String input) {
+        try {
+            UUID.fromString(input);
+            return true;
+        } catch (IllegalArgumentException e) {
+            return false;
+        }
+    }
+}
+```
+
 ## Thread
 
 ### Thread Pool

src/main/java/string/UuidGeneratorSnippet.java

@@ -0,0 +1,57 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2017-2022 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package string;
+
+import java.util.UUID;
+
+/**
+ * UuidGeneratorSnippet.
+ */
+public class UuidGeneratorSnippet {
+
+  /**
+   * Generates a random UUID (version 4).
+   *
+   * @return A string representation of a UUID.
+   */
+  public static String generateUUID() {
+    return UUID.randomUUID().toString();
+  }
+
+  /**
+   * Validates if a string is a valid UUID.
+   *
+   * @param input the string to validate
+   * @return true if valid UUID, false otherwise
+   */
+  public static boolean isValidUUID(String input) {
+    try {
+      UUID.fromString(input);
+      return true;
+    } catch (IllegalArgumentException e) {
+      return false;
+    }
+  }
+}

src/test/java/string/UuidGeneratorSnippetTest.java

@@ -0,0 +1,51 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2017-2022 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package string;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class UuidGeneratorSnippetTest {
+
+  @Test
+  void generateUUID_shouldReturnValidUUID() {
+    String uuid = UuidGeneratorSnippet.generateUUID();
+    assertTrue(UuidGeneratorSnippet.isValidUUID(uuid));
+  }
+
+  @Test
+  void isValidUUID_shouldReturnTrueForValidUUID() {
+    assertTrue(UuidGeneratorSnippet.isValidUUID("123e4567-e89b-12d3-a456-426614174000"));
+  }
+
+  @Test
+  void isValidUUID_shouldReturnFalseForInvalidUUID() {
+    assertFalse(UuidGeneratorSnippet.isValidUUID("not-a-uuid"));
+    assertFalse(UuidGeneratorSnippet.isValidUUID("1234"));
+  }
+
+}