使用位序列打印long

public class BitSequencePrinter {
    public static void main(String[] args) {
        long number = 123456789L;
        printBitSequence(number);
    }

    public static void printBitSequence(long number) {
        StringBuilder bitSequence = new StringBuilder();
        for (int i = 63; i >= 0; i--) {
            long mask = 1L << i;
            if ((number & mask) != 0) {
                bitSequence.append("1");
            } else {
                bitSequence.append("0");
            }
        }
        System.out.println("Bit sequence of " + number + ": " + bitSequence);
    }
}

public static void printBitSequence(long number) {
    StringBuilder bitSequence = new StringBuilder();
    boolean isNegative = number < 0;
    if (isNegative) {
        number = -number;
    }
    for (int i = 63; i >= 0; i--) {
        long mask = 1L << i;
        if ((number & mask) != 0) {
            bitSequence.append("1");
        } else {
            bitSequence.append("0");
        }
    }
    if (isNegative) {
        // 处理符号位
        for (int i = 0; i < 64; i++) {
            if (bitSequence.charAt(i) == '0') {
                bitSequence.setCharAt(i, '1');
            } else {
                bitSequence.setCharAt(i, '0');
            }
        }
        // 加1
        int carry = 1;
        for (int i = 63; i >= 0; i--) {
            if (bitSequence.charAt(i) == '0' && carry == 1) {
                bitSequence.setCharAt(i, '1');
                carry = 0;
            } else if (bitSequence.charAt(i) == '1' && carry == 1) {
                bitSequence.setCharAt(i, '0');
            }
        }
    }
    System.out.println("Bit sequence of " + number + ": " + bitSequence);
}