程式碼

//思路：使用者登入檔案系統，然後建立、開啟、讀、寫、關閉、刪除檔案

import java.io.*;
import java.util.*;

public class Main{

	public static void main(String[] args){
		Scanner scan = new Scanner(System.in);
		login();
		menu();
		String[] splits = new String[2];
		while(true){
			splits[0] = scan.next();
			splits[1] =scan.
 
next();
			switch(splits[0]){
				case "create": 
						create(splits[1]);
						break;
				case "open":
						open(splits[1]);
						break;
				case "read":
						open(splits[1]);
						break;
				case "delete":
						delete(splits[1]);
						break;
				case "write":
						write(splits[1]);
						break
 
;
				case "close":
						close(splits[1]);
						break;
			}
		}
				
	}
	
	//登入
	public static void login(){
		Scanner scan = new Scanner(System.in);
		System.out.print("請輸入使用者名稱: ");
		String name = scan.next();
		System.out.print("請輸入密碼：");
		String password = scan.next();
		System.out.println("恭喜，您已經登入檔案系統！"
 
);
	}
	//選單
	public static void menu(){
		System.out.println("--------------------------------------------------");
		System.out.println("create 檔名---------------------------建立檔案");
		System.out.println("delete 檔名---------------------------刪除檔案");
		System.out.println("open 檔名----------------------------開啟檔案");
		System.out.println("write 檔名----------------------------寫檔案");
		System.out.println("read 檔名-----------------------------讀檔案");
		System.out.println("close 檔名----------------------------關閉檔案");
	}
	//建立檔案
	public static void create(String filename){
		try{
			File dir = new File(".",filename);
			dir.createNewFile();
			System.out.println(filename+"已經建立成功！");
		}catch(Exception e){
			e.printStackTrace();
		}
	}
	//刪除檔案
	public static void delete(String filename){
		try{
			File file = new File(filename);
			file.delete();
		}catch(Exception e){
			e.printStackTrace();
		}
	}
	//讀檔案
	public static void open(String filename){
		try{
			File file = new File(filename);
			BufferedReader br = new BufferedReader(new FileReader(file));
			String str = null;
			while((str = br.readLine()) != null){
				System.out.println(str);
			}
			br.close();
		}catch(Exception e){
			e.printStackTrace();
		}
	}
	//寫檔案
	public static void write(String filename){
		try{
			Scanner scan = new Scanner(System.in);
			File file = new File(filename);
			FileWriter fw = new FileWriter(file);
			String str = scan.next();
			while(!str.equals("#")){
				fw.write(str);
				str = scan.next();
			}
			fw.close();
			System.out.println("寫入完畢");
		}catch(Exception e){
			e.printStackTrace();
		}
	}
	//關閉檔案
	public static void close(String filename){
		System.out.println(filename+"已經關閉！");
	}
}

結果