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Modern Java: From Fundamentals to Advanced Architecture

Solution: Network Permission Flags

Explore how to manipulate network permission flags using bitwise operators in Java. Understand defining flags with powers of two, merging them with the OR operator, and checking specific permissions using the AND operator. This lesson helps you visualize binary representations and apply these techniques effectively in Java programs.

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Java 25
public class PermissionManager {
    public static void main(String[] args) {
        // 1. Define distinct bit flags
        int READ = 1;      // Binary: 001
        int WRITE = 2;     // Binary: 010
        int EXECUTE = 4;   // Binary: 100
        // 2. Combine flags using Bitwise OR (|)
        // 001 | 010 = 011 (Decimal 3)
        int userPerms = READ | WRITE;
        // 3. Check for specific permissions using Bitwise AND (&)
        // (011 & 100) == 100 ? -> 000 == 100 ? -> false
        boolean canExecute = (userPerms & EXECUTE) == EXECUTE;
        // (011 & 001) == 001 ? -> 001 == 001 ? -> true
        boolean canRead = (userPerms & READ) == READ;
        // 4. Output boolean checks
        System.out.println("Can Execute: " + canExecute);
        System.out.println("Can Read: " + canRead);
        // 5. Use the Wrapper method to inspect the bits
        System.out.println("Binary Perms: " + Integer.toBinaryString(userPerms));
    }
}
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