BAEL-5332-convert-byte-array-and-uuid (eugenp#11822)

vunamtien · tienvn4 · web-flow · commit acc36114f378 · 2022-02-15T21:19:44.000+01:00
Co-authored-by: tienvn4 &lt;tienvn4@ghtk.co&gt;
diff --git a/core-java-modules/core-java-8-2/src/main/java/com/baeldung/uuid/UuidHelper.java b/core-java-modules/core-java-8-2/src/main/java/com/baeldung/uuid/UuidHelper.java
@@ -0,0 +1,33 @@
+package com.baeldung.uuid;
+
+import java.nio.ByteBuffer;
+import java.util.Arrays;
+import java.util.UUID;
+
+public class UuidHelper {
+
+    public static byte[] convertUUIDToBytes(UUID uuid) {
+        ByteBuffer bb = ByteBuffer.wrap(new byte[16]);
+        bb.putLong(uuid.getMostSignificantBits());
+        bb.putLong(uuid.getLeastSignificantBits());
+        return bb.array();
+    }
+
+    public static UUID convertBytesToUUID(byte[] bytes) {
+        ByteBuffer byteBuffer = ByteBuffer.wrap(bytes);
+        long high = byteBuffer.getLong();
+        long low = byteBuffer.getLong();
+        return new UUID(high, low);
+    }
+
+    public static void main(String[] args) {
+        UUID uuid = UUID.randomUUID();
+        System.out.println("Original UUID: " + uuid);
+
+        byte[] bytes = convertUUIDToBytes(uuid);
+        System.out.println("Converted byte array: " + Arrays.toString(bytes));
+
+        UUID uuidNew = convertBytesToUUID(bytes);
+        System.out.println("Converted UUID: " + uuidNew);
+    }
+}
