如何通过移位将浮点数存储在Byte数组中

Question

I can store a int value in a byte array of size 4 using:

byte[] toByteArray(int value) {
        return new byte[] {
            (byte) (value >> 24),
            (byte) (value >> 16),
            (byte) (value >> 8),
            (byte) value};
    }

How can i store a float in a byte array using bit shift?

Answer 1

You should use: Float.floatToIntBits(float val) to get the raw representation of the float and then convert the returned int to byte[] .

To read back the float, use Float.intBitsToFloat(int i)

Answer 2

Remember that a float is 4 bytes . You can use a ByteBuffer to store the float and provide the byte array for you.

public byte[] toByteArray(float value) {    
    ByteBuffer buffer = ByteBuffer.allocate(4);
    buffer.putFloat(value);
    return buffer.array();
}

Internally this uses the Bits class which does something similar to what you were doing with your toByteArray(int) method.