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Added in API level 1

Summary: Methods | Inherited Methods | [Expand All]

public interface Group
implements Principal

java.security.acl.Group

该接口用于表示一组校长。（委托人代表个人用户或公司等实体）。

请注意，该组扩展了Principal。因此，可以将Principal或Group作为参数传递给包含Principal参数的方法。例如，您可以通过调用对象的addMember方法，并将其传递给Principal或Group，将Principal或Group添加到Group对象。

Public methods
`abstract boolean`	`addMember(Principal user)` 将指定的成员添加到组中。
`abstract boolean`	`isMember(Principal member)` 如果传递的委托人是组的成员，则返回true。
`abstract Enumeration<? extends Principal>`	`members()` 返回组中成员的枚举。
`abstract boolean`	`removeMember(Principal user)` 从组中删除指定的成员。

From interface java.security.Principal

Added in API level 1

boolean addMember (Principal user)

将指定的成员添加到组中。

Parameters
`user`	`Principal`: the principal to add to this group.

Returns
`boolean`	true if the member was successfully added, false if the principal was already a member.

Added in API level 1

boolean isMember (Principal member)

如果传递的委托人是组的成员，则返回true。此方法执行递归搜索，因此，如果主体属于属于该组成员的组，则返回true。

Parameters
`member`	`Principal`: the principal whose membership is to be checked.

Returns
`boolean`	true if the principal is a member of this group, false otherwise.

Added in API level 1

Enumeration<? extends Principal> members ()

返回组中成员的枚举。返回的对象可以是Principal或Group（它是Principal的子类）的实例。

Returns
`Enumeration<? extends Principal>`	an enumeration of the group members.

Added in API level 1

boolean removeMember (Principal user)

从组中删除指定的成员。

Parameters
`user`	`Principal`: the principal to remove from this group.

Returns
`boolean`	true if the principal was removed, or false if the principal was not a member.