文件類字符串getAbsolutePath() (File Class String getAbsolutePath())

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

  軟件包java.io.File.getAbsolutePath()中提供了此方法。

• This method is used to return the absolute path of the file object (i.e absolute path is the complete path like this c:\\ Articles\\myjava.txt) if filepath is absolute then it retrieve the complete path of the file object.

  如果filepath是絕對路徑，則此方法用于返回文件對象的絕對路徑(即，絕對路徑是諸如c：\\ Articles \\ myjava.txt這樣的完整路徑)，然后它將檢索文件對象的完整路徑。

• The return type of this method is String so it returns the absolute path from the root in a string form.

  此方法的返回類型為String，因此它以字符串形式返回從根開始的絕對路徑。

• In this method, if we don’t give an absolute path in the file object then also it will return the absolute path of file object where your file exists.

  在這種方法中，如果我們沒有在文件對象中給出絕對路徑，那么它將返回文件所在的文件對象的絕對路徑。

• This method may raise an exception( i.e. Security Exception) if the desired value cannot be accessed.

  如果無法訪問所需的值，則此方法可能引發異常(即Security Exception)。

Syntax:

句法：

    String getAbsolutePath(){
}

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 String so it returns the complete path of the file object as a String.

該方法的返回類型為String，因此它以String形式返回文件對象的完整路徑。

Java程序演示getAbsolutePath()方法的示例 (Java program to demonstrate example of getAbsolutePath() 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 GetAbsolutePath {
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\\myjava.txt");
File file2 = new File("java.txt");
// By using getAbsolutePath() return the complete 
// path(whatever you have given in the file object) of the 
// file object because in the file1 object we already given 
// absolute path 
// [C:\\Users\\computer clinic\\OneDrive\\Articles\\myjava.txt]
String abs_path1 = file1.getAbsolutePath();
// Display absolute path of the file object if given path is absolute.
System.out.println("The path of the file 1 if given path is absolute :" + " " + abs_path1);
// By using getAbsolutePath() return the complete path of the File 
// object even we have not given full path or absolute path is 
// not given [i.e.(java.txt) so it return the whole path 
// with filename where file exists ]
String abs_path2 = file2.getAbsolutePath();
// Display absolute path of the file object if given path is not absolute.
System.out.println("The path of the file2 if given path is not absolute :" + " " + abs_path2);
} catch (Exception e) {
System.out.println("An error occurred.");
e.printStackTrace();
}
}
}

Output

輸出量

D:\Programs>javac GetAbsolutePath.java
D:\Programs>java GetAbsolutePath
The path of the file 1 if given path is absolute : C:\Users\computer clinic\OneDrive\myjava.txt
The path of the file2 if given path is not absolute : D:\Programs\java.txt

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