Java File Handling

 1. This program helps to create a new file , with their inner content: 

package com.test.file;

import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.Scanner;

public class CreateNewFIleWithContent {
    public static void getFileCreated(){
        Scanner sc = new Scanner(System.in);
        System.out.print(" Enter the file name path :  ");
        String filePath=sc.nextLine();
        filePath= filePath.replace("/","\\");
        try {
            FileOutputStream fos = new FileOutputStream(filePath, true);
            System.out.print(" Enter the content inside the file: ");
            String content = sc.nextLine();
            fos.write(content.getBytes());
            fos.close();
        }
        catch(IOException e){
        e.printStackTrace();
        }
    }
    public static void main(String[] args) {
        getFileCreated();
    }
}

2. This program will help to copy from one file to another :

package com.test.file;
import java.io.*;
public class FileHandling {
    public static void getFileHandles(String inputFile , String outputFile ) throws IOException {

        inputFile= inputFile.replace("/","\\");
        outputFile=outputFile.replace("/","\\");

        File input = new File (""+inputFile+"");
        File output = new File (""+outputFile+"");

        FileInputStream fis = null;
        FileOutputStream fos = null;
        try {
            fis = new FileInputStream(input);
            fos = new FileOutputStream(output);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        int i = 0;
        try{
        while(((i = fis.read()) != -1)){
            fos.write(i);
        }
        }catch (IOException e) {
            e.printStackTrace();
        }
        finally {
            if(fis != null){
                fis.close();
            }   }    }
    public static void main(String[] args) throws IOException {
        getFileHandles("C:/Users/ankur/Desktop/test.pdf","C:/Users/ankur/Desktop/test3.pdf");

    }
}

3. This program will help to check any file / directory present inside the given path:

package com.test.file;

import java.io.File;

public class FolderFiles {

    public static void getFileFolderInfo(){

        String filePath = "/Users/ankur/Desktop";

        File file = new File(filePath);

        int counter = 0,counter1=0,counter2=0;

        File[] fileFolder = file.listFiles();
        System.out.println(" the tpotal size :" + fileFolder.length);

        for (File f : fileFolder) {

            if (f.isFile()) {
                counter += 1;
                System.out.println(" This is file :" + f.getName() + " the total counter is :" + counter);

            } else if (f.isDirectory()) {

                 counter1 += 1;
                System.out.println(" This is Director: " + f.getName() + "          " + counter1);
            }
            else {
            counter2 += 1;
            System.out.println(" This is something else :" + f.getName() + "          " + counter2);
        }
            }
        System.out.println(counter+ "      " +
                " " +counter1+ "       "  +counter2);
    }
    public static void main(String[] args) {
        getFileFolderInfo();
    }
}

4. This program will help user to read a file and copy it to console and other files too.

package com.test.file;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

public class FileReaderClass {

    private static void getFileRead(){
        String path = "\\Users\\ankur\\Desktop";
        FileInputStream fis= null;
        FileOutputStream fos= null;
        try{
            File file = new File(path+"\\a1.pdf");
            File out = new File(path+"\\a2.pdf");
            fis = new FileInputStream(file);
            fos = new FileOutputStream(out);

            int value = 0; 
            while((value = fis.read())!=-1) {
            System.out.print((char) value);
            fos.write(value);
              }
        }   catch(Exception e){
        e.printStackTrace();
        }finally {
            try {
                fis.close();
                fos.close();
            } catch(Exception e){
                e.printStackTrace();
             }
        }
    }
    public static void main(String[] args) {
        getFileRead();
    }
}