Java如何獲取檔案的父目錄或上級目錄？

在Java程式中，如何獲取檔案的父目錄或上級目錄？

以下範例顯示如何使用File類的file.getParent()方法獲取檔案的父目錄。

package com.yiibai;

import java.io.File;

public class ParentDirectory {
    public static void main(String[] args) {
        File file = new File("F:\\worksp\\javaexamples\\java_directories\\myfile.txt");
        String strParentDirectory = file.getParent();
        System.out.println("Parent directory is : " + strParentDirectory);
    }
}

執行上面範例程式碼，得到以下結果 -

Parent directory is : F:\worksp\javaexamples\java_directories

範例-2

以下是Java中獲取檔案的父目錄或所在目錄的另一個範例。

package com.yiibai;

import java.io.File;
import java.util.Scanner;

public class ParentDirectory2 {
    public static void main(String args[]) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("Enter the file path: ");
        String filePath = scanner.next();
        File fileToTest = new File(filePath);

        if (!fileToTest.isDirectory()) {
            System.out.println("This is File");
            System.out.println("Parent Folder of this file is :" + fileToTest.getParent());
        } else {
            System.out.println("This is Directory");
            System.out.println("Parent Folder of this directory is :" + fileToTest.getParent());
        }
    }
}

執行上面範例程式碼，得到以下結果 -

Enter the file path: 
F:\worksp\javaexamples\java_directories
This is Directory
Parent Folder of this directory is :F:\worksp\javaexamples