用IO流中的File类来创建文件及目录

package com.jinglin.dept4.day0822wenjianmulu;

public class FileSystem {

    public static void main(String[] args) {
        CaiDan cc=new CaiDan();
        cc.caidan();
    }

}

package com.jinglin.dept4.day0822wenjianmulu;

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

public class CaiDan {
    File file;
    Scanner sc=new Scanner(System.in);
    public void caidan(){
        System.out.println("(1)创建目录   （2）创建文件   （3）删除目录   （4）删除文件");
        System.out.println("请选择：");
        int num=sc.nextInt();
        switch(num){
        case 1:
            crecatalog();
            back();
            break;
        case 2:
            crefile();
            back();
            break;
        case 3:
            delcatalog();
            back();
            break;
        case 4:
            delfile();
            back();
            break;
        default:
            System.out.println("选择错误，请重新选择");
            caidan();
            break;

        }
    }
    private void delfile() {
        System.out.println("文件名字：");
        String name=sc.next();
        System.out.println("文件路径：");
        String dir=sc.next();
        file=new File(dir+""+name);
        File file1=file.getParentFile();
        if(!file1.exists()){
            file.delete();
            System.out.println("删除成功！");
        }else{
            System.out.println("文件已删除！");
        }
    }
    private void delcatalog() {
        System.out.println("目录名字：");
        String name=sc.next();
        System.out.println("目录路径：");
        String dir=sc.next();
        file=new File(dir+" "+name);
        File file1=file.getParentFile();
        if(!file.exists()){
            file.delete();
            System.out.println("删除成功！");
        }else{
            System.out.println("目录已经删除");
        }
    }
    
    private void crefile() {
        System.out.println("文件名字：");
        String name=sc.next();
        System.out.println("文件路径：");
        String dir=sc.next();
        file=new File(dir+""+name);
        File file1=file.getParentFile();
        if(!file1.exists()){
            try {
                file.createNewFile();
            } catch (IOException e) {
                e.printStackTrace();
            }
            System.out.println("创建成功！");
            
        }else{
            System.out.println("文件已存在！");
        }
    }
    private void back() {
        System.out.println("选1回到窗口界面，选2退出程序");
        int num=sc.nextInt();
        switch(num){
            case 1:
                caidan();
                break;
            case 2:
                System.out.println("退出程序！");
                break;
            default:
                System.out.println("选择错误！");
                break;
        }
    }
    private void crecatalog() {
        System.out.println("目录名字：");
        String name=sc.next();
        System.out.println("目录路径：");
        String dir=sc.next();
        file=new File(dir+" "+name);
        File file1=file.getParentFile();
        if(!file.exists()){
            file.mkdir();
            System.out.println("创建成功！");
        }else{
            System.out.println("目录已经存在");
        }
    }
    
}