FEAT StringUtils.toHex(byte[]) method

src/main/java/de/nclazz/commons/StringUtils.java

@@ -1,5 +1,7 @@
 package de.nclazz.commons;
 
+import lombok.NonNull;
+
 public abstract class StringUtils {
 
     private StringUtils() { /* no-op */ }
@@ -75,4 +77,21 @@ public abstract class StringUtils {
         return sb.toString();
     }
 
+    /**
+     * Create a hex-{@code String} from given byte array,
+     * @param bytes array
+     * @return new {@code String}
+     * @throws NullPointerException if bytes are {@code null}
+     */
+    public static String toHex(@NonNull  byte[] bytes) {
+        StringBuilder sb = new StringBuilder(bytes.length*2);
+
+        for (int v : bytes) {
+            sb.append(Character.forDigit((v >> 4) & 0xF, 16))
+                    .append(Character.forDigit((v & 0xF), 16));
+
+        }
+        return sb.toString();
+    }
+
 }