文件类boolean isDirectory() (File Class boolean isDirectory())

• This method is available in package java.io.File.isDirectory().

  软件包java.io.File.isDirectory()中提供了此方法。

• This method is used to check whether the file is specified by filepath is a directory or not.

  此方法用于检查filepath指定的文件是否为目录。

• The return type of this method is Boolean i.e. The value of this method is true or false if it returns true that means the file is represented by filepath is a directory else return false so it is not a directory.

  此方法的返回类型为布尔值，即，如果该方法返回true，则该值为true或false，这意味着该文件由filepath表示为目录，否则返回false，因此它不是目录。

• This method may raise an exception(i.e. Security Exception) if the read access is not given to the file.

  如果未授予文件读取权限，则此方法可能会引发异常(即Security Exception)。

Syntax:

句法：

boolean isDirectory(){    }

Parameter(s):

参数：

We don’t pass any object as a parameter in the method of the File.

我们不会在File方法中将任何对象作为参数传递。

Return value:

返回值：

The return type of this method is Boolean i.e. it returns true than in that case file is specified by abstract file path is a directory else returns false so the file is specified is not in a directory.

此方法的返回类型为Boolean，即，与在那种情况下文件由抽象文件路径指定为目录的情况下返回true，否则返回false，因此指定的文件不在目录中。

Java程序演示isDirectory()方法的示例 (Java program to demonstrate example of isDirectory() method)

// import the File class because we will use File class methodsimport java.io.File;// import the Exception class because it may raise // an exception when working with filesimport java.lang.Exception;public class ToCheckFileDirectory {
       public static void main(String[] args) {
           try {
               // Specify the path of file and we use double slashes             // to escape '\' character sequence for windows otherwise             // it will be considerable as url.            File file1 = new File("C:\\Users\\computer clinic\\OneDrive\\Articles");            File file2 = new File("C:\\Users\\computer clinic\\OneDrive\\JavaArticles");            // By using isDirectory() is used to check whether             // the filepath is a directory or not.             // It returns true because given filepath is a directory .            if (file1.isDirectory())                System.out.println("This filepath " + " " + file1.getAbsolutePath() + " " + "is a directory");            else                System.out.println("This filepath " + " " + file1.getAbsolutePath() + " " + "is not a directory");            // By using isDirectory() is used to check whether             // the filepath is a directory or not. It returns false             // because given filepath is not a directory .            if (file2.isDirectory())                System.out.println("This filepath " + " " + file2.getAbsolutePath() + " " + "is a directory ");            else                System.out.println("This filepath " + " " + file2.getAbsolutePath() + " " + "is not a directory");        } catch (Exception e) {
               System.out.println("An error occurred.");            e.printStackTrace();        }    }}

Output

输出量

D:\Programs>javac ToCheckFileDirectory.javaD:\Programs>java ToCheckFileDirectoryThis filepath C:\Users\computer clinic\OneDrive\Articles is a directoryThis filepath C:\Users\computer clinic\OneDrive\JavaArticles is not a directory

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