File文件过滤器(简单小示例)

package file;

import java.io.File;
import java.io.FilenameFilter;

/**
 * @Author YangHe
 * @Date 2020/4/12 21:45
 * 文件过滤器
 */

class MyFilter implements FilenameFilter{

    @Override
    public boolean accept(File dir, String name) {
        //判断是否为.java 结尾或者一个目录
        return name.endsWith(".java")||new File(name).isDirectory();
    }
}
public class FileNameFilterTest {
    public static void main(String[] args) {
        File file=new File(".");
        String[] nameList=file.list();
        System.out.println("未加过滤器效果");
        for(String str : nameList){
            System.out.println(str);
        }
        String[] nameList2=file.list(new MyFilter());
        System.out.println("加过滤器效果");
        for(String str : nameList2){
            System.out.println(str);
        }
    }
}