Java java.lang.management.ManagementPermission用法及代碼示例

java.lang.ManagementPermission 類包含確定對係統資源的訪問權限的抽象方法。每個對象都有一些名稱。大多數權限對象還有一些與之關聯的“actions”，用於告知該權限對象允許哪些活動。

類聲明：

public final class ManagementPermission
extends BasicPermission

構造函數：

Permission(String name)

public Permission(String name)：使用該名稱構造一個新的 Permission 對象。

方法：

1.public void checkGuard(Object object)：用於判斷該Permission對象是否可以被保護(保護對另一個對象的訪問)。

Parameters:
object - the object to guard.
Throws:
SecurityException - if the access is denied by checkPermission method.

2.publicabstractbooleanimplied(Permissionpermission)：檢查這個ManagementPermssion對象是否隱含這個權限。

Parameters:
permission - the permission to check against.
Returns:
true if this permission is implied by this object, false otherwise.

3.public Abstract boolean equals(Object obj)：檢查兩個Permission對象是否相等。

Parameters:
obj - the object to be compared
Returns:
true if both Permission objects are equal, false otherwise.

4.public abstract int hashCode()：返回此 Permission 對象的哈希碼值。

Returns:
a hash code value for this object.

5.public Final String getName()：返回該權限的名稱。

Returns:
the name of this Permission.

6.public Abstract String getActions()：以String格式返回此Permission對象的操作。

Returns:
the actions of this Permission.

7.公共 PermissionCollection newPermissionCollection()：它返回一個新的PermissionCollection對象。

Returns:
a new PermissionCollection object

8.public String toString()：返回指定Permission對象的字符串表示形式。

Returns:
string representation of the specified Permission object.

import java.lang.management.ManagementPermission; 
import java.security.Permission; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
        // Creating a new ManagementPermission object with 
        // name control 
        Permission p = new ManagementPermission("control"); 
        try { 
            // Printing name of the object 
            System.out.println("Name: " + p.getName()); 
            // Printing hash value of the object 
            System.out.println("Hashcode: " + p.hashCode()); 
            // Printing actions of the object 
            System.out.println("Actions: "
                               + p.getActions()); 
            // Converting this managementPermission object 
            // to new PermissionCollection object 
            System.out.println( 
                "As a new PermissionCollection object: "
                + p.newPermissionCollection().toString()); 
            // Checking if new permissionCollection implies 
            // managementPermission object or not 
            System.out.println( 
                "Implies: "
                + p.newPermissionCollection().implies(p)); 
        } 
        catch (Exception e) { 
            System.err.println(e.toString()); 
        } 
    } 
}

Name: control
Hashcode: 951543133
Actions: 
As a new PermissionCollection object: java.security.BasicPermissionCollection@5b6f7412 (
)

Implies: false