关于权限管理的思考

public class Main
{
    public static void main (String[] args)
    {

        // 假设只有10个权限
        // 位操作实现的权限管理最多只能管理32个权限(0-31)。
        int powerLength = 10;

        // 某人所拥有的权限
        int power[] = {1, 3, 4 };
        int powerCode = 0;
        for (int i = 0; i < power.length; i++)
        {
            powerCode |= 1 << power[i];
        }
        System.out.println("------------------------------------");
        for (int i = 0; i < powerLength; i++)
        {
            int temp = powerCode >> i;
            if ((temp & 1) == 1)
            {
                System.out.println("权限：" + i);
            }
        }
    }
}

 

public class Main
{
    public static void main (String[] args)
    {
        //用long型也只能管理64种权限
        int powerLength = 64;
        // 某人所拥有的权限
        int power[] = {0, 1, 3, 4, 31, 35, 63 };
        long powerCode = 0;
        for (int i = 0; i < power.length; i++)
        {
            System.out.println(Long.toBinaryString((long) 1 << power[i]));
            powerCode |= (long) 1 << power[i];
        }

        System.out.println(Long.toBinaryString(powerCode));
        for (int i = 0; i < powerLength; i++)
        {
            long temp = powerCode >> i;
            if ((temp & 1) == 1)
            {
                System.out.println("权限：" + i);
            }
        }
    }
}