BAEL-7703: Update article "Converting Between Byte Arrays and Hexadecimal Strings in Java" (#16271)

algorithms-modules/algorithms-miscellaneous-5/pom.xml

@@ -5,6 +5,18 @@
     <modelVersion>4.0.0</modelVersion>
     <artifactId>algorithms-miscellaneous-5</artifactId>
     <version>0.0.1-SNAPSHOT</version>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>17</source>
+                    <target>17</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
     <name>algorithms-miscellaneous-5</name>
 
     <parent>

algorithms-modules/algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/conversion/HexStringConverter.java

@@ -1,15 +1,12 @@
 package com.baeldung.algorithms.conversion;
 
-import java.math.BigInteger;
+import com.google.common.io.BaseEncoding;
-
+import jakarta.xml.bind.DatatypeConverter;
-
-
 import org.apache.commons.codec.DecoderException;
 import org.apache.commons.codec.binary.Hex;
 
-import com.google.common.io.BaseEncoding;
+import java.math.BigInteger;
-
+import java.util.HexFormat;
-import jakarta.xml.bind.DatatypeConverter;
 
 public class HexStringConverter {
 
@@ -109,4 +106,14 @@ public class HexStringConverter {
         return BaseEncoding.base16()
             .decode(hexString.toUpperCase());
     }
+
+    public String encodeUsingHexFormat(byte[] bytes) {
+        HexFormat hexFormat = HexFormat.of();
+        return hexFormat.formatHex(bytes);
+    }
+
+    public byte[] decodeUsingHexFormat(String hexString) {
+        HexFormat hexFormat = HexFormat.of();
+        return hexFormat.parseHex(hexString);
+    }
 }

algorithms-modules/algorithms-miscellaneous-5/src/test/java/com/baeldung/algorithms/conversion/ByteArrayConverterUnitTest.java

@@ -1,15 +1,13 @@
 package com.baeldung.algorithms.conversion;
 
-import static org.hamcrest.MatcherAssert.assertThat;
-import static org.junit.jupiter.api.Assertions.assertArrayEquals;
-import static org.junit.jupiter.api.Assertions.assertThrows;
-
 import org.apache.commons.codec.DecoderException;
 import org.hamcrest.text.IsEqualIgnoringCase;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
-import com.baeldung.algorithms.conversion.HexStringConverter;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
 
 class ByteArrayConverterUnitTest {
 
@@ -118,6 +116,22 @@ class ByteArrayConverterUnitTest {
         assertArrayEquals(bytes, output);
     }
 
+    @Test
+    void shouldEncodeByteArrayToHexStringUsingHexFormat() throws DecoderException {
+        byte[] bytes = getSampleBytes();
+        String hexString = getSampleHexString();
+        String output = hexStringConverter.encodeUsingHexFormat(bytes);
+        assertThat(output, IsEqualIgnoringCase.equalToIgnoringCase(hexString));
+    }
+
+    @Test
+    void shouldDecodeHexStringToByteArrayUsingHexFormat() throws DecoderException {
+        byte[] bytes = getSampleBytes();
+        String hexString = getSampleHexString();
+        byte[] output = hexStringConverter.decodeUsingHexFormat(hexString);
+        assertArrayEquals(bytes, output);
+    }
+
     private String getSampleHexString() {
         return "0af50c0e2d10";
     }