(JAVA)File类2

package filedemo;

import java.io.File;
import java.io.FileFilter;
import java.text.DateFormat;
import java.util.Date;


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);}
        }
    }


}