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  • Question: kotlin int to byte array
  • Time: Asked 23 minute ago
  • Modified: Asked 36 days ago
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kotlin int to byte array

To convert an Int value to a byte array in Kotlin, you can use the ByteBuffer class. Here’s an example:

kotlin
val value: Int = 123456789 // the value you want to convert to a byte array val buffer = ByteBuffer.allocate(4) // allocate a buffer of 4 bytes (an Int is 4 bytes) buffer.putInt(value) // put the Int value into the buffer val byteArray: ByteArray = buffer.array() // get the byte array from the buffer // print out the byte array as hex values for (b in byteArray) { print(String.format("%02x ", b)) }

Output:

bash
07 5b cd 15

In this example, we first allocate a buffer of 4 bytes using the ByteBuffer.allocate() method. We then put the Int value into the buffer using the putInt() method. Finally, we get the byte array from the buffer using the array() method.

Note that the byte order used by ByteBuffer is the native byte order of the system. If you need to specify a specific byte order, you can use the order() method on the ByteBuffer object before putting the value into the buffer.

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scala int to byte array

To convert an integer value to a byte array in Scala, you can use the ByteBuffer class from the java.nio package. Here’s an example code snippet:

scala
import java.nio.ByteBuffer val value: Int = 12345 val buffer: ByteBuffer = ByteBuffer.allocate(Integer.BYTES).putInt(value) val byteArray: Array[Byte] = buffer.array()

In the above code, we first define the integer value 12345. We then create a new ByteBuffer with a capacity of 4 bytes (the size of an int in Java). We then put the integer value into the buffer using the putInt method, which writes the integer value as four bytes in the buffer in the order of most significant byte first. Finally, we retrieve the byte array from the buffer using the array method.

Note that the byte array returned by the array method is backed by the buffer, so any changes made to the byte array will be reflected in the buffer and vice versa. If you need a copy of the byte array that is independent of the buffer, you can use the array method with no arguments to create a new byte array:

scala
val byteArray: Array[Byte] = buffer.array().clone()

kotlin outputstream to byte array

In Kotlin, you can use the ByteArrayOutputStream class to write data to a byte array. Here is an example:

kotlin
import java.io.ByteArrayOutputStream fun main() { val outputStream = ByteArrayOutputStream() outputStream.write("Hello, World!".toByteArray()) val byteArray = outputStream.toByteArray() println(byteArray.contentToString()) }

In this example, we create an instance of ByteArrayOutputStream and use its write method to write a string to the stream. Finally, we call the toByteArray method to get the byte array representation of the stream’s contents. We then print the byte array using the contentToString method.

The output of this program will be:

csharp
[72, 101, 108, 108, 111, 44, 32, 87, 111, 114, 108, 100, 33]

which is the ASCII representation of the string “Hello, World!”.

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