1
我试图将-101
转换为字节数组,然后将字节数组转换回-101
。下面我的方法适用于正值,但不适用于负值。你能提出我做错了什么吗?而不是-101
,byteArrayToInt
方法返回65435
。谢谢!字节数组* *签名* Int
/**
* Converts a <code>byte</code> array to a 32-bit <code>int</code>.
*
* @param array The <code>byte</code> array to convert.
* @return The 32-bit <code>int</code> value.
*/
public static int byteArrayToInt(byte[] array) {
ValidationUtils.checkNull(array);
int value = 0;
for (int i = 0; i < array.length; i++) {
int shift = (array.length - 1 - i) * 8;
value = value | (array[i] & 0xFF) << shift;
}
return value;
}
/**
* Converts a 32-bit <code>int</code> to a <code>byte</code> array.
*
* @param value The 32-bit <code>int</code> to convert.
* @return The <code>byte</code> array.
*/
public static byte[] intToByteArray(int value, int size) {
byte[] bytes = new byte[size];
for (int index = 0; index < bytes.length; index++) {
bytes[index] = (byte) (value >>> (8 * (size - index - 1)));
}
return bytes;
}
/**
* Tests the utility methods in this class.
*
* @param args None.
*/
public static void main(String... args) {
System.out.println(byteArrayToInt(intToByteArray(32, 2)) == 32); // true
System.out.println(byteArrayToInt(intToByteArray(64, 4)) == 64); // true
System.out.println(byteArrayToInt(intToByteArray(-101, 2)) == -101); // false
System.out.println(byteArrayToInt(intToByteArray(-101, 4)) == -101); // true
}