记录权限的一种策略

public class AuthoritySolution {

    private static final long m_Read = 0x00000001; // 64 byte
    private static final long m_Write = 0x00000002;

    public static boolean canRead(long role) {
        long t = role & m_Read;
        return t != 0;
    }

    public static boolean canWrite(long role) {
        long t = role & m_Write;
        return t != 0;
    }

    public static boolean canReadAndWrite(long role) {
        long t = role & (m_Write | m_Read);
        return t != 0;
    }
   
    public static void main(String[] abc){
       
        final long roler1=0x00000003;
        System.out.println("roler1 can read?"+canRead(roler1));
        System.out.println("roler1 can write?"+canWrite(roler1));
        System.out.println("roler1 can read and write?"+canReadAndWrite(roler1));
       
        final long roler2=0x00000004;
        System.out.println("roler2 can read?"+canRead(roler2));
        System.out.println("roler2 can write?"+canWrite(roler2));
        System.out.println("roler2 can read and write?"+canReadAndWrite(roler2));
    }
}