package util;

public class PermissionController {
    public static final int INSERT = 2;
    public static final int UPDATE = 4;
    public static final int DELETE = 8;

    private int permission = 0;

    public boolean canInsert() {
        return hasPermission(INSERT);
    }

    public boolean canUpdate() {
        return hasPermission(UPDATE);
    }

    public boolean canDelete() {
        return hasPermission(DELETE);
    }

    public void addInsertPermission() {
        addPermission(INSERT);
    }

    public void addUpdatePermission() {
        addPermission(UPDATE);
    }

    public void addDeletePermission() {
        addPermission(DELETE);
    }

    public void removeInsertPermission() {
        removePermission(INSERT);
    }

    public void removeUpdatePermission() {
        removePermission(UPDATE);
    }

    public void removeDeletePermission() {
        removePermission(DELETE);
    }
    
    public int getPermissionValue() {
        return permission;
    }

    private void addPermission(int p) {
        permission |= p;
    }

    private void removePermission(int p) {
        permission = permission & (~p);
    }
    
    private boolean hasPermission(int p) {
        return (permission & p) == p ? true : false;
    }

    public static void main(String[] args) {
        PermissionController p = new PermissionController();
        
        System.out.println("添加权限......");
        // 添加权限
        p.addInsertPermission();
        System.out.printf("Can insert: %s\n", p.canInsert());
        
        // 删除权限
        p.addDeletePermission();
        System.out.printf("Can delete: %s\n", p.canDelete());
        
        System.out.printf("Can update: %s\n", p.canUpdate());
        System.out.println(Integer.toBinaryString(p.getPermissionValue()));
        
        System.out.println("删除权限......");
        // 去掉删除权限
        p.removeDeletePermission();
        System.out.printf("Can delete: %s\n", p.canDelete());
        
        System.out.println(Integer.toBinaryString(p.getPermissionValue()));
    }
}

------解决方案--------------------
使用enum的特性，能使得代码更加的简练
Java code
package util;

public class PermissionController {
    private int permission = 0;

    static public enum Permission {
        INSERT(1), UPDATE(2), DELETE(4); // 每个权限的值是2的n次幂
        private final int value;

        private Permission(int value) {
            this.value = value;
        }

        public int getValue() {
            return value;
        }
    }

    public void addPermission(Permission p) {
        for (Permission t : Permission.values()) {
            if (t == p) {
                permission |= p.getValue();
            }
        }
    }

    public void removePermission(Permission p) {
        for (Permission t : Permission.values()) {
            if (t == p) {
                permission = permission & (~p.getValue());
            }
        }
    }

    public boolean hasPermission(Permission p) {
        return (permission & p.getValue()) == p.getValue() ? true : false;
    }

    public int getPermissionValue() {
        return permission;
    }

    public static void main(String[] args) {
        PermissionController p = new PermissionController();

        // 增加添加权限
        System.out.println("增加添加权限");
        p.addPermission(Permission.INSERT);
        System.out.printf("Can insert: %s\n", p.hasPermission(Permission.INSERT));

        // 增加删除权限
        System.out.println("增加删除权限");
        p.addPermission(Permission.DELETE);
        System.out.printf("Can delete: %s\n", p.hasPermission(Permission.DELETE));

        System.out.printf("Can update: %s\n", p.hasPermission(Permission.UPDATE));
        System.out.println(Integer.toBinaryString(p.getPermissionValue()));

        System.out.println("去掉删除权限......");
        // 去掉删除权限
        p.removePermission(Permission.DELETE);
        System.out.printf("Can delete: %s\n", p.hasPermission(Permission.DELETE));
        System.out.printf("Can insert: %s\n", p.hasPermission(Permission.INSERT));

        System.out.println(Integer.toBinaryString(p.getPermissionValue()));
    }
}