如何将字节操作的代码从 Java 翻译成 Kotlin？

Question

我想在 Kotlin 中翻译这个方法，但我不知道要转换哪些变量才能正确地做事并拥有正确的操作记忆：

public static UUID bytestoUUID(byte[] buf, int offset) {
    long lsb = 0;
    for (int i = 15; i >= 8; i--) {
        lsb = (lsb << 8) | (buf[i + offset] & 0xff);
    }

    long msb = 0;
    for (int i = 7; i >= 0; i--) {
        msb = (msb << 8) | (buf[i + offset] & 0xff);
    }

    return new UUID(msb, lsb);
}

你有正确的方法吗？谢谢

Answer 1

应该是

import java.util.*
import kotlin.experimental.and

 fun bytestoUUID(buf: ByteArray, offset: Int): UUID {
    var lsb: Long = 0
    for (i in 15 downTo 8) {
        lsb = lsb shl 8 or ((buf[i + offset] and 0xff.toByte()).toLong())
    }
    var msb: Long = 0
    for (i in 7 downTo 0) {
        msb = msb shl 8 or ((buf[i + offset] and 0xff.toByte()).toLong())
    }
    return UUID(msb, lsb)
}

Answer 2

我终于找到了让单元测试起作用的好方法。

fun bytestoUUID(buf: ByteArray, offset: Int): UUID {
    var lsb: Long = 0
    for (i in 15 downTo 8) {
        lsb = lsb shl 8 or (buf[i + offset].toLong() and 0xff)
    }

    var msb: Long = 0
    for (i in 7 downTo 0) {
        msb = msb shl 8 or (buf[i + offset].toLong() and 0xff)
    }

    return UUID(msb, lsb)
}

Answer 3

fun bytestoUUID(buf: ByteArray, offset: Int): UUID? {
    var lsb: Long = 0
    for (i in 15 downTo 8) {
        lsb = lsb shl 8 or (buf[i + offset] and 0xff)
    }
    var msb: Long = 0
    for (i in 7 downTo 0) {
        msb = msb shl 8 or (buf[i + offset] and 0xff)
    }
    return UUID(msb, lsb)
}

如何将字节操作的代码从 Java 翻译成 Kotlin？

How to translate code with byte operation from Java to Kotlin?

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