-
Notifications
You must be signed in to change notification settings - Fork 2
Expand file tree
/
Copy pathPermission.java
More file actions
55 lines (48 loc) · 1.67 KB
/
Copy pathPermission.java
File metadata and controls
55 lines (48 loc) · 1.67 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
package Conllection;
/**
*
*
*类说明：位运算的应用
*/
public class Permission {
// 是否允许查询，二进制第1位，0表示否，1表示是
public static final int ALLOW_SELECT = 1 << 0; // 0001 = 1
// 是否允许新增，二进制第2位，0表示否，1表示是
public static final int ALLOW_INSERT = 1 << 1; // 0010 = 2
// 是否允许修改，二进制第3位，0表示否，1表示是
public static final int ALLOW_UPDATE = 1 << 2; // 0100 =4
// 是否允许删除，二进制第4位，0表示否，1表示是
public static final int ALLOW_DELETE = 1 << 3; // 1000 = 8
// 存储目前的权限状态
private int flag;
//设置用户的权限
public void setPer(int per) {
flag = per;
}
//增加用户的权限（1个或者多个）
public void enable(int per) {
flag = flag|per;
}
//删除用户的权限（1个或者多个）
public void disable(int per) {
flag = flag&~per;
}
//判断用户的权限
public boolean isAllow(int per) {
return ((flag&per)== per);
}
//判断用户没有的权限
public boolean isNotAllow(int per) {
return ((flag&per)==0);
}
public static void main(String[] args) {
int flag = 15;
Permission permission = new Permission();
permission.setPer(flag);
permission.disable(ALLOW_DELETE|ALLOW_INSERT);
System.out.println("select = "+permission.isAllow(ALLOW_SELECT));
System.out.println("update = "+permission.isAllow(ALLOW_UPDATE));
System.out.println("insert = "+permission.isAllow(ALLOW_INSERT));
System.out.println("delete = "+permission.isAllow(ALLOW_DELETE));
}
}