How Can I Convert a Java String to a Byte Array and Back?

Conversion of Java String to Byte Array

Question:

How can a Java String be converted into a byte array?

Answer:

To convert a Java String to a byte array, utilize one of the following methods:

• byte[] b = string.getBytes(); (Platform Default Charset)
• byte[] b = string.getBytes(Charset.forName("UTF-8")); (UTF-8 Charset)
• byte[] b = string.getBytes(StandardCharsets.UTF_8); (Java 7 Only)

Displaying Byte Array:

The default toString() method of a byte array doesn't provide a useful representation. To view the byte array in a human-readable format, use:

• Arrays.toString(bytes); (Commas between values)

Retrieving String from Byte Array:

To convert a byte array back to a String, use:

• String string = new String(byte[] bytes, Charset charset); (Specify the desired charset)

Note on Character Encoding:

It's essential to understand the character encoding used when converting between strings and byte arrays. Strings in Java are internally stored using UTF-16. Using different character encodings (e.g., ASCII, UTF-8) will result in different byte array representations for the same glyphs.

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