Java 拆分字节数组
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Splitting a Byte array
提问by Tara Singh
Is it possible to get specific bytes from a byte array in java?
是否可以从java中的字节数组中获取特定字节？
I have a byte array:
我有一个字节数组：
byte[] abc = new byte[512];
and i want to have 3 different byte arrays from this array.
我想从这个数组中得到 3 个不同的字节数组。
- byte 0-127
- byte 128-255
- byte256-511.
- 字节 0-127
- 字节 128-255
- 字节 256-511。
I tried abc.read(byte[], offset,length)but it works only if I give offset as 0, for any other value it throws an IndexOutOfboundsexception.
我试过了，abc.read(byte[], offset,length)但它只有在我将偏移量设置为 0 时才有效，对于任何其他值，它都会引发IndexOutOfbounds异常。
What am I doing wrong?
我究竟做错了什么？
采纳答案by tangens
You can use Arrays.copyOfRange()for that.
你可以用Arrays.copyOfRange()它。
回答by Bozho
Arrays.copyOfRange()is introduced in Java 1.6. If you have an older version it is internally using System.arraycopy(...). Here's how it is implemented:
Arrays.copyOfRange()在 Java 1.6 中引入。如果您有旧版本，它会在内部使用System.arraycopy(...). 这是它的实现方式：
public static <U> U[] copyOfRange(U[] original, int from, int to) {
Class<? extends U[]> newType = (Class<? extends U[]>) original.getClass();
int newLength = to - from;
if (newLength < 0) {
throw new IllegalArgumentException(from + " > " + to);
}
U[] copy = ((Object) newType == (Object)Object[].class)
? (U[]) new Object[newLength]
: (U[]) Array.newInstance(newType.getComponentType(), newLength);
System.arraycopy(original, from, copy, 0,
Math.min(original.length - from, newLength));
return copy;
}
回答by Ron
You could use byte buffers as views on top of the original array as well.
您也可以使用字节缓冲区作为原始数组顶部的视图。
