String to Byte array Java

To convert a Java String to a byte array, you can use the getBytes method of the String class. This method returns a byte array that represents the string using the default platform encoding.

Here's an example of how to use the getBytes method:

String s = "hello";
byte[] bytes = s.getBytes();

You can also specify a specific encoding to use when converting the string to a byte array. For example, to use the UTF-8 encoding, you can use the following code:

String s = "hello";
byte[] bytes = s.getBytes(StandardCharsets.UTF_8);

It's important to use the same encoding when converting a byte array back to a String as when converting the String to a byte array, to ensure that the resulting String is the same as the original.

Here's an example of how you can convert a byte array back to a String using the UTF-8 encoding:

byte[] bytes = {'h', 'e', 'l', 'l', 'o'};
String s = new String(bytes, StandardCharsets.UTF_8);

You can find more information about character encodings and the getBytes and String constructors in the Java documentation.