展示存储 Float 浮点型数据的具体结构

JavaFloatBitsExhibition.java

public void showFloatBits(float floatNumber) {
    var FLOAT_BYTE_SIZE = 4;
    var BYTE_BIT_SIZE = 8;
    var FLOAT_SYMBOL_POSITION = 1;
    var FLOAT_MANTISSA_POSITION = 10;

    var byteBuffer = ByteBuffer.allocate(FLOAT_BYTE_SIZE);
    byteBuffer.putFloat(floatNumber);
    var numberByteArray = byteBuffer.array();

    var buffer = new String[FLOAT_BYTE_SIZE * BYTE_BIT_SIZE + 2];

    var bitPosition = 0;
    for (int i = 0; i < FLOAT_BYTE_SIZE; i++) {
        for (int j = 0; j < BYTE_BIT_SIZE; j++) {
            buffer[bitPosition] = String.valueOf(numberByteArray[i] >> (BYTE_BIT_SIZE - j - 1) & 0B1);
            bitPosition++;

            // 位置标识分开符号、指数和尾数
            if (bitPosition == FLOAT_SYMBOL_POSITION || bitPosition == FLOAT_MANTISSA_POSITION) {
                buffer[bitPosition] = "-";
                bitPosition++;
            }
        }
    }

    Arrays.stream(buffer).forEach(System.out::print);
}