How to Convert Between Java Byte Array, String, and Byte Array?

Conversion between Java Byte Array, String, and Byte Array

In Java, exchanging data often involves converting between string and byte array formats. This conversion plays a crucial role in network communication and data storage.

Suppose you have a byte array that you wish to convert into a string. This conversion is necessary if you need to send the data over the network as a string. One common approach is to use the Arrays.toString() method, which provides a string representation of the byte array:

byte[] data = {1, 2, 3, 4, 5};
String dataString = Arrays.toString(data);

The resulting dataString variable will contain a string representation of the byte array: [1, 2, 3, 4, 5].

Once you have the data in string format, you may need to convert it back into a byte array. This is commonly required when receiving data over the network and storing it in a byte array for further processing.

To convert the string representation of the byte array back into a byte array, you need to parse the individual byte values from the string and construct a new byte array with those values. Here's an example of how to perform this conversion:

String receivedString = "[-47, 1, 16, 84, 2, 101, 110, 83, 111, 109, 101, 32, 78, 70, 67, 32, 68, 97, 116, 97]";

// Split the string into individual byte values
String[] byteValues = receivedString.substring(1, receivedString.length() - 1).split(",");

// Create a new byte array with the parsed byte values
byte[] bytes = new byte[byteValues.length];
for (int i = 0; i < bytes.length; i++) {
    bytes[i] = Byte.parseByte(byteValues[i].trim());
}

After executing this code, the bytes variable will contain the restored byte array from the string representation.

It's important to note that the Arrays.toString() method returns a string representation of the array, not the actual byte array itself. Therefore, to retrieve the original byte array, you need to explicitly parse the byte values from the string and reconstruct the byte array.

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