getparent

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

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

  軟件包java.io.File.getParent()中提供了此方法。

• This method is used to return the parent of the given file object(i.e In case of file object it returns the filepath where the file exists in the form of a string).

  此方法用于返回給定文件對象的父對象(即，如果是文件對象，則以字符串形式返回文件所在的文件路徑)。

• The return type of this method is String (i.e It returns the parent of the file object and parent is in String form(i.e filepath is string where the file exists).

  此方法的返回類型為String(即，它返回文件對象的父級，并且父級為String形式(即，文件路徑是文件所在的字符串)。

Syntax:

句法：

    String getParent(){
}

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 i.e. It returns the parent of the given file object if parent does not exist then it returns null as a string.

此方法的返回類型為String，即，如果給定文件對象的父級不存在，則返回該父級，然后返回null作為字符串。

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

// import the File class because we will use File class methods
import java.io.*;
// import the Exception class because it may raise an 
// exception when working with files
import java.lang.Exception;
public class GetParent {
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("myjava.txt");
// By using getParent() method returns a string which 
// contain the parent of the given file object.
String file_parent1 = file1.getParent();
// By using getParent() method returns null as a string 
// because there is no parent of the given file object.
String file_parent2 = file2.getParent();
// Display the parent of the given file object
System.out.println("The parent of the given file_parent1 is :" + file_parent1);
System.out.println("The parent of the given file_paren2 is :" + file_parent2);
} catch (Exception e) {
System.out.println("An error occurred.");
e.printStackTrace();
}
}
}

Output

輸出量

D:\Programs>javac GetParent.java
D:\Programs>java GetParent
The parent of the given file_parent1 is :C:\Users\computer clinic\OneDrive\Articles
The parent of the given file_paren2 is :null

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

getparent