学步园

package com.jzm.io;
import java.io.File;
import java.io.FilenameFilter;
import java.util.Scanner;
class  OnlyExt2 implements FilenameFilter{
    private  String ext;		  
	public OnlyExt2(String ext) {
	super();
	this.ext = "."+ext;
}
	@Override
	public boolean accept(File dir, String name) {				
		return name.endsWith(this.ext);
	}	
}
 class InputDirListOnly {
	public static void main(String[] args){	
		
	  String  dirname =  null;
	  String  extname = null;
	  Scanner scanner = new Scanner(System.in);   //从键盘读入
	  System.out.println("请输入你要查看的文件目录:如 d:/java/");
	  dirname = scanner.nextLine();	 
	  System.out.println("请输入你要查看到得扩展名:如html,exe"); 
	  extname = scanner.nextLine();	  
	  File f1 = new File(dirname);  
	  
	  FilenameFilter  only  =  new OnlyExt(extname);
	  String s[] = f1.list(only);	  
	  for ( int i = 0; i < s.length; i++){
		       System.out.println((s[i]));
	 }	 
	}
}

测试结果：

请输入你要查看的文件目录:如 d:/java/
c:/
请输入你要查看到得扩展名:如html,exe
ini
boot.ini
rmtips.ini