dircommond.java

模拟实现DIR功能,在输入路径时能返回相应的文件信息

import java.io.*;
public class Dircommond{
	public void serch(String s){		
		File   file   =   new   File(s); 		  
        if(file.exists()){           
            if(file.isDirectory()){   
                File[]   files   =file.listFiles();   
                if(files!=null){
		          for(int i=0; i<files.length; i++)     
		  
		         System.out.println(files[i].getName());       
		 
		        }
		       else{
		            System.out.print("目录不存在");
		       }   
            }   
        }   
	}		
	
	public static String input()
  	 {String string="";
  	  try
  	  {BufferedReader in=new BufferedReader(new InputStreamReader(System.in));
  	    string=in.readLine();
  	  	}catch(IOException e){}
  	 	return string;
  	 	}	
	
	public static void main(String[] args){
		Dircommond d=new Dircommond();
		String str=new String();
		String s="dir";
		System.out.print("请输入目录路径：");
		str=input();
		System.out.print("请输入命令：");
		if(d.input().equals(s)) d.serch(str);
	}
}