public class Test {
    public static void main(String[] args) throws Throwable {
        int m = -5;
        int n = Math.abs(m); //取负数的绝对值
        byte[] b = new byte[32];
        System.out.printf("--------binary of abs(%d)----------\n", m);
        for (int i=0; i<32; i++) { //获取绝对值的原码
            b[i] = (byte)(n>>>(32-i-1) & 0x1);
            System.out.printf("%d", (int)b[i]);
        }
        System.out.println("\n--------negate each byte----------");
        for (int i=0; i<32; i++) { //原码的各位取反
            b[i] = (byte)(~b[i] & 0x1);
            System.out.printf("%d", (int)b[i]);
        }
        System.out.println("\n--------plus 1----------");
        b[31] += 1; //取反后+1，也就是最后1位+1
        for (int i=31; i>0; i--) { //然后判断是否有发生进位
            if (b[i] == 2) { //发生进位
                b[i] = 0;
                b[i-1]++;
            } else { //否则，退出循环，因为后面也不会再发生进位了
                break;
            }
        }
        b[0] %= 2; //判断最高位是否越界
        for (int i=0; i<32; i++) {
            System.out.printf("%d", (int)b[i]);
        }
        System.out.println("\n--------check----------");
        System.out.println(Integer.toBinaryString(m)); //用API的结果检验转换结果
    }
}