文件類boolean isDirectory() (File Class boolean isDirectory())

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

  軟件包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.

  此方法用于檢查filepath指定的文件是否為目錄。

• 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.

  此方法的返回類型為布爾值，即，如果該方法返回true，則該值為true或false，這意味著該文件由filepath表示為目錄，否則返回false，因此它不是目錄。

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

  如果未授予文件讀取權限，則此方法可能會引發異常(即Security Exception)。

Syntax:

句法：

    boolean isDirectory(){
}

Parameter(s):

參數：

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

我們不會在File方法中將任何對象作為參數傳遞。

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.

此方法的返回類型為Boolean，即，與在那種情況下文件由抽象文件路徑指定為目錄的情況下返回true，否則返回false，因此指定的文件不在目錄中。

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 methods
import java.io.File;
// import the Exception class because it may raise 
// an exception when working with files
import 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

輸出量

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

翻譯自: https://www.includehelp.com/java/file-class-boolean-isdirectory-method-with-example.aspx