package com.test.IODemo1;

import java.io.File;

import java.io.FileFilter;

public class MyFilter implements FileFilter{

    @Override

    public boolean accept(File pathname) {

        //把".java"文件挑出来

        return pathname.getName().endsWith(".java");

    }

}

package com.test.IODemo1;

import java.io.File;

public class FileFilterDemo1 {

    public static void main(String[] args) {

        File file = new File("d:\\upload");

        MyFilter myFilter = new MyFilter();

        File[] listFiles = file.listFiles(myFilter);

        for(File f : listFiles) {

            System.out.println(f);

        }

    }

}