Kotlin中的类和对象之间的区别 [英] Difference between a class and object in Kotlin
问题描述
我是Kotlin的新手,最近将一个简单的文件从java转换为Kotlin。我想知道为什么Android转换器将我的java类改为Kotlin对象。
I'm new to Kotlin and have recently converted a simple file from java to Kotlin. I am wondering why the Android converter changed my java class to a Kotlin object.
Java:
public class MyClass {
static public int GenerateChecksumCrc16(byte bytes[]) {
int crc = 0xFFFF;
int temp;
int crc_byte;
for (byte aByte : bytes) {
crc_byte = aByte;
for (int bit_index = 0; bit_index < 8; bit_index++) {
temp = ((crc >> 15)) ^ ((crc_byte >> 7));
crc <<= 1;
crc &= 0xFFFF;
if (temp > 0) {
crc ^= 0x1021;
crc &= 0xFFFF;
}
crc_byte <<= 1;
crc_byte &= 0xFF;
}
}
return crc;
}
}
转换后的Kotlin:
Converted Kotlin:
object MyClass {
fun GenerateChecksumCrc16(bytes: ByteArray): Int {
var crc = 0xFFFF
var temp: Int
var crc_byte: Int
for (aByte in bytes) {
crc_byte = aByte.toInt()
for (bit_index in 0..7) {
temp = crc shr 15 xor (crc_byte shr 7)
crc = crc shl 1
crc = crc and 0xFFFF
if (temp > 0) {
crc = crc xor 0x1021
crc = crc and 0xFFFF
}
crc_byte = crc_byte shl 1
crc_byte = crc_byte and 0xFF
}
}
return crc
}
}
为什么不是:
class MyClass {
... etc ...
}
任何帮助都会非常感谢谢谢。
Any help would be greatly appreciated thanks.
推荐答案
Kotlin对象就像一个无法实例化的类,因此必须按名称调用。 (静态类本身)
A Kotlin object is like a class that can't be instantiated so it must be called by name. (a static class per se)
android转换器看到你的类只包含一个静态方法,所以它将它转换为Kotlin对象。
The android converter saw that your class contained only a static method, so it converted it to a Kotlin object.
在此处阅读更多相关信息: http://petersommerhoff.com/dev/kotlin/kotlin-for-java-devs/#objects
Read more about it here: http://petersommerhoff.com/dev/kotlin/kotlin-for-java-devs/#objects
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