File 类 - 目录操作

mkdir 创建一级目录，mkdirs 递归创建多级目录，delete 删除空目录或文件。

import java.io.File;
public class Main {
    public static void main(String[] args) {
//        deleteFile01();
//        deleteFolder01();
        createFolder01();
        createFolder02();
    }
    // 创建目录
    public static void createFolder01() {
        String path = "./new folder";
        File file = new File(path);
        if (file.exists()) {
            System.out.println("目录已存在");
            return;
        }
        file.mkdir();
        System.out.println("目录已创建");
    }
    // 递归创建目录
    public static void createFolder02() {
        String path = "./new folder/new folder/new folder/new folder/new folder/new folder";
        File file = new File(path);
        if (file.exists()) {
            System.out.println("目录已存在");
            return;
        }
        file.mkdirs();
        System.out.println("目录已创建");
    }
    // 删除文件夹
    public static void deleteFolder01() {
        String path = "./new folder";
        File file = new File(path);
        // 如果文件夹存在
        if (file.exists()) {
            if (!file.isDirectory()) {
                System.out.println("不是文件夹");
                return;
            }
            if (file.delete()) {
                System.out.println("删除成功");
            } else {
                System.out.println("删除失败");
            }
        } else {
            System.out.println("文件夹不存在");
        }
    }
    // 删除文件
    public static void deleteFile01() {
        String path = "./create03.txt";
        File file = new File(path);
        // 如果文件存在
        if (file.exists()) {
            if (file.delete()) {
                System.out.println("删除成功");
            } else {
                System.out.println("删除失败");
            }
        } else {
            System.out.println("文件不存在");
        }
    }
}