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    <pre><code> byte[] bytes = {-1, 0, 1, 2, 3 }; StringBuilder sb = new StringBuilder(); for (byte b : bytes) { sb.append(String.format("%02X ", b)); } System.out.println(sb.toString()); // prints "FF 00 01 02 03 " </code></pre> <h3>See also</h3> <ul> <li><a href="http://java.sun.com/javase/6/docs/api/java/util/Formatter.html#syntax" rel="noreferrer"><code>java.util.Formatter</code> syntax</a> <ul> <li><code>%[flags][width]conversion</code> <ul> <li>Flag <code>'0'</code> - The result will be zero-padded </li> <li>Width <code>2</code></li> <li>Conversion <code>'X'</code> - The result is formatted as a hexadecimal integer, uppercase</li> </ul></li> </ul></li> </ul> <hr> <p>Looking at the text of the question, it's also possible that this is what is requested:</p> <pre><code> String[] arr = {"-1", "0", "10", "20" }; for (int i = 0; i &lt; arr.length; i++) { arr[i] = String.format("%02x", Byte.parseByte(arr[i])); } System.out.println(java.util.Arrays.toString(arr)); // prints "[ff, 00, 0a, 14]" </code></pre> <hr> <p>Several answers here uses <a href="http://java.sun.com/javase/6/docs/api/java/lang/Integer.html#toHexString%28int%29" rel="noreferrer"><code>Integer.toHexString(int)</code></a>; this is doable, but with some caveats. Since the parameter is an <code>int</code>, a widening primitive conversion is performed to the <code>byte</code> argument, which involves sign extension.</p> <pre><code> byte b = -1; System.out.println(Integer.toHexString(b)); // prints "ffffffff" </code></pre> <p>The 8-bit <code>byte</code>, which is signed in Java, is sign-extended to a 32-bit <code>int</code>. To effectively undo this sign extension, one can mask the <code>byte</code> with <code>0xFF</code>.</p> <pre><code> byte b = -1; System.out.println(Integer.toHexString(b &amp; 0xFF)); // prints "ff" </code></pre> <p>Another issue with using <code>toHexString</code> is that it doesn't pad with zeroes:</p> <pre><code> byte b = 10; System.out.println(Integer.toHexString(b &amp; 0xFF)); // prints "a" </code></pre> <p>Both factors combined should make the <code>String.format</code> solution more preferrable.</p> <h3>References</h3> <ul> <li><a href="http://java.sun.com/docs/books/jls/third_edition/html/typesValues.html#4.2.1" rel="noreferrer">JLS 4.2.1 Integral Types and Values</a> <ul> <li>For <code>byte</code>, from <code>-128</code> to <code>127</code>, inclusive</li> </ul></li> <li><a href="http://java.sun.com/docs/books/jls/third_edition/html/conversions.html#5.1.2" rel="noreferrer">JLS 5.1.2 Widening Primitive Conversion</a></li> </ul>
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    1. POJava code To convert byte to Hexadecimal
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    1. COThis code returns an enormously large value..
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    2. CO@Vivek: what is "an enormously large value"? What's the input and what's the output?
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    3. COLet me explain again.. I have a collection of byte strings in an array. But what i have to do is analyse each byte seperately.. So, I dont want to work on the whole array, but individual byte string at a time, that is one component of that array.. The confusion arised because of the word "array". Now in the below code " byte bv = 10; String hexString = Integer.toHexString(bv); " CAse 1 (Byte Recieved : 68 Hex Output : : 44) Case : 2 (Byte Recieved : -46 Hex Output : : ffffffd2)......... Why am I getting such an unexpected result for some values ?
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