Answer:
Check the explanation
Explanation:
Code to create the program in the question above:
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.Scanner;
public class ReadWriteInt
{
public static void main(String args[]) throws IOException
{
Scanner input=new Scanner(System.in);
System.out.println("Enter the name of the input file:");
String inputFile=input.next();
System.out.println("Enter the name of the output file:");
String outputFile=input.next();
File fin=new File(inputFile);
File fout=new File(outputFile);
//print error, if input file does not exist
if(!fin.exists())
{
System.out.println("Error:Input file does not exist");
System.exit(0);
}
//print error, if output file does not exist
if(!fout.exists())
{
System.out.println("Error:output file does not exist");
System.exit(0);
}
//input stream to read
Scanner read=new Scanner(fin);
OutputStream os=new FileOutputStream(fout);
//output stream to write
PrintWriter write=new PrintWriter(os,true);
//read from input file until there are no numbers
while(read.hasNextLine())
{
String num=read.nextLine();
//convert the string into number
int number=Integer.parseInt(num);
//if the number is positive , write it to out put file
if(number>=0)
{
write.println(number);
System.out.println(number);
}
}
System.out.println("Positive numbers are copied successfully");
}
}
Following are the program to the given question:
Program Explanation:
Program:
import java.io.*;//import package
import java.util.*;//import package
public class Main //defining Main class
{
public static void process(Scanner o, PrintWriter c)//defining a process method that takes file values
{
String l;//defining a String variable
while(o.hasNextLine())//defining while loop that reads file value
{
l = o.nextLine();//using String variable that holds file value
if(Integer.parseInt(l) > 0)//defining if block that checks value is positive value
{
c.println(l);//add value in output file
}
}
c.flush();//calling flush method
c.close();//calling close method
}
public static void main(String[] arx)//main method
{
String I_name,O_name; //defining a String variable
Scanner in = new Scanner(System.in);//creating the Scanner class Object to input value
System.out.print("Enter the input file name: ");//print message
I_name = in.next();//input file name
System.out.print("Enter the output file name: ");//print message
O_name= in.next();//input file name
try //defining try block
{
Scanner f_in = new Scanner(new File(I_name));//creating Scanner class Object that reads file value
PrintWriter f_out = new PrintWriter(new File(O_name));//creating PrintWriter class Object that prints file value
process(f_in, f_out);//calling process method that takes two parameters
}
catch (Exception ex)//defining catch block
{
System.out.println("File not found!");//print message
}
}
}
Output:
Please find the attached file.
Learn more:
brainly.com/question/15735985
