package filedemo;import java.io.File;
import java.io.FileFilter;
import java.text.DateFormat;
import java.util.Date;/*** @author Alina* @date 2021年10月10日 11:15 下午* 1.获取文件最后修改时间 Long lastModified()* 2.以数组获取路径下所有文件String[]  list();File[] listFile()* 3.对文件名进行过滤：接口boolean  accept()* 4.递归：实现一个目录的全遍历*/
class myFilter implements FileFilter {public boolean accept(File pathname){return pathname.getName().endsWith(".txt");}
}public class FileDemo1 {public static void main(String[] args)throws Exception {method_getAllDir(new File("/Users/yuzhang/Desktop/"));}public static void method_lastModifine(){File file = new File("/Users/yuzhang/Desktop/IdeaProjects/pricyice/src/com");long lastTime = file.lastModified();DateFormat date = DateFormat.getDateTimeInstance() ;String time =  date.format(new Date());System.out.println(time);}public static void method_list(){File file = new File("/Users/yuzhang/Desktop");String str[] = file.list();for(String s :str){System.out.println(s);}}public static void method_listFile(){File file = new File("/Users/yuzhang/Desktop");File[] fir = file.listFiles();for(File f : fir){System.out.println(f);}}public static void method_Filter()throws Exception{File file = new File("/Users/yuzhang/Desktop/");File[] f = file.listFiles(new myFilter());for(File files :f){System.out.println(files);}}public static void method_getAllDir(File dir){//listFiles() 获取参数目录下的内容File [] files = dir.listFiles();//files 数组，有文件，有文件夹//遍历拿到目录下的内容for (File f : files){//如果拿到的是文件夹，进行下一步遍历if(f.isDirectory()){method_getAllDir(f);}else{System.out.println(f);}}}}