File class (check)

1,exists() Check for presence

2,length() Get the file length, which is long data type {

String character string ：length(), Returns the number in the string

Array ： Array name .length, Attribute , Get the number of elements in the array

aggregate ： Collection object name .size(), Returns the number of collection elements

}

3,getName() Get the file name Sting data type

4,getPath() Return file path

5,getAbsolutePath() Returns the absolute path of the file

import java.io.File;

public class filedemo2 {
    public static void main(String[] args) {
        File file =new File("D:\\aaa.txt");
        boolean f1 = file.exists();
        if(f1){
            System.out.println(" The file exists ");
        }else{
         file.mkdir();
            System.out.println(" File created successfully ");
        }
    }
}