2020.03.02 File类

package com.guoyun.view;

import java.io.File;
import java.io.FileReader;
import java.io.IOException;

/**
 * ClassName:
 * Function:  ADD FUNCTION
 * Reason:   ADD REASON
 *
 * @author
 * @Date
 * @since Ver 1.1
 */
public class Test1 {


    public static void main(String[] args) {
        //renameTo方法
//        File file3=new File("E:/JAVA/Test");
//        File file4=new File("E:/JAVA/Test2");
//        System.out.println(file3.renameTo(file4));
        //带盘符的为绝对路径
        File file=new File("E:/JAVA/新建文件夹/Test");
        if(!(file.exists())){
            file.mkdirs();
        }
        File file1=new File(file,"aojie.txt");
        if(!(file1.exists())){
            try {
                file1.createNewFile();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        File file2=new File(file,"aoji.txt");
        if(!(file2.exists())){
            try {
                file2.createNewFile();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        File file3=new File(file,"aojie.jpg");
        if(!(file3.exists())){
            try {
                file3.createNewFile();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

//        if (file2.exists()) {
//
//            file2.delete();
//            System.out.println("已找到该文件并删除成功！");
//        }
        String[] temp=file.list();
        for (int i = 0; i <temp.length ; i++) {
            if(temp[i].endsWith(".jpg")){
                System.out.println(temp[i]);
            }
        }

        System.out.println(printLength(file));
        File file4=new File("hello.txt");
        try {
            file4.createNewFile();
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println(file4.exists());

    }
    public static int printLength(File file){
        File[] files=file.listFiles();
        int count=0;
        for (int i = 0; i <files.length ; i++) {
            if(files[i].isDirectory()){
                    printLength(files[i]);
            }else {
                count+=files[i].length();
            }

        }
       return count;
    }
}