Question

How to write a Java program that reads the file "input.txt" and writes all even values from this file into a new file called "output.txt."

Sample input 10 12 1 3 5 34 2 5 7 9 44

Answer 1

import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.util.Scanner;

public class FilterNumberFile {

    public static void main(String[] args) {
        File file = new File("input.txt");
        try {
            Scanner fin = new Scanner(file);
            PrintWriter pw = new PrintWriter("output.txt");
            int num;
            while (fin.hasNextInt()) {
                num = fin.nextInt();
                if (num % 2 == 0) {
                    pw.println(num);
                }
            }
            pw.close();
            fin.close();
        } catch (FileNotFoundException e) {
            System.out.println(file.getAbsolutePath() + " does not exists!");
        }
    }
}