FilePermission類implies()方法 (FilePermission Class implies() method)

• implies() method is available in java.io package.

  implies()方法在java.io包中可用。

• implies() method is used to check whether this FilePermission implies the given permission (perm) or not.

  implies()方法用于檢查此FilePermission是否隱含給定的權(quán)限(權(quán)限)。

• implies() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  implies()方法是一個(gè)非靜態(tài)方法，僅可通過(guò)類對(duì)象訪問(wèn)，如果嘗試使用類名訪問(wèn)該方法，則會(huì)收到錯(cuò)誤消息。

• implies() method does not throw an exception at the time of implies the given permission.

  implies()方法在隱含給定權(quán)限時(shí)不會(huì)引發(fā)異常。

Syntax:

句法：

public boolean implies(Permission perm);

Parameter(s):

參數(shù)：

• Permission perm – represents the permission object to be checked.

  權(quán)限權(quán)限 –表示要檢查的權(quán)限對(duì)象。

Return value:

返回值：

The return type of the method is boolean, it returns true based on some statements:

該方法的返回類型為boolean ，它基于一些語(yǔ)句返回true ：

• When the given permission object is an instance of FilePermission.

  當(dāng)給定的權(quán)限對(duì)象是FilePermission的實(shí)例時(shí)。

• When the given permission actions are a proper subset of this FilePermission object actions.

  當(dāng)給定的權(quán)限操作是此FilePermission對(duì)象操作的適當(dāng)子集時(shí)。

• When the pathname of the given permission object is implied by this FilePermission object pathname.

  當(dāng)此FilePermission對(duì)象的路徑名隱含給定權(quán)限對(duì)象的路徑名時(shí)。

• Otherwise, it returns false.

  否則，它返回false 。

Example:

例：

// Java program to demonstrate the example // of boolean implies(Permission perm) method // of FilePermissionimport java.io.*;public class ImpliesOfFP {public static void main(String[] args) throws Exception {FilePermission fp1 = null;FilePermission fp2 = null;try {// Instantiates FilePermission fp1 , fp2 fp1 = new FilePermission("D:\\includehelp.txt", "read");fp2 = new FilePermission("D:\\includehelp.txt", "write");// By using implies() method is to check// whether this FilePermission implies the// given permission or notboolean status = fp1.implies(fp1);System.out.println("fp1.implies(fp1): " + status);status = fp2.implies(fp1);System.out.println("fp2.implies(fp1): " + status);} catch (Exception ex) {System.out.println(ex.toString());}} }

Output

輸出量

fp1.implies(fp1): true fp2.implies(fp1): false

翻譯自: https://www.includehelp.com/java/filepermission-implies-method-with-example.aspx

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