The given code prompt the user to input two integers and validate them. Then. we have calculated the odd numbers between two input values,sum of values and output all numbers from second input number to first one.

import java.io.*;
import java.util.*;
import java.text.*;

class Examples{

    public static void main(String[] args) throws Exception{
        Scanner input=new Scanner(System.in);
        System.out.print("Enter Num1: ");
        int firstNum =input.nextInt();

        System.out.print("Enter Num2: ");
        int secondNum =input.nextInt();
        while(firstNum<0){
            System.out.print("Number should be positive.!Re-enter: ");
            firstNum =input.nextInt();
        }
        while(secondNum<0){
            System.out.print("Number should be positive.!Re-enter: ");
            secondNum =input.nextInt();
        }
        while(secondNum>1000){
            System.out.print("Second Number should be less than 1000!Re-enter: ");
            secondNum =input.nextInt();
        }
        while(secondNum<firstNum){
            System.out.print("Second Number should be at least 10 greater than firstNum.Re-enter: ");
            secondNum =input.nextInt();
        }
        int sum=0;
        File f=new File("c:/numbers.txt");
        BufferedWriter bw=new BufferedWriter(new FileWriter(f,true));
        bw.write("Odd numbers from "+Integer.toString(firstNum)+" to "+Integer.toString(secondNum));
        bw.newLine();

            for(int i=firstNum;i<=secondNum;i++){
                sum+=i;
                if((i%2)!=0){
                    bw.write(Integer.toString(i));
                    bw.newLine();
                }
            }

            bw.write("Sum of Numbers: "+sum);
            bw.newLine();
            bw.write("Output all numbers from secondNum to firstNum:");
            bw.newLine();
            for(int i=secondNum;i>=firstNum;i--){
                bw.write(Integer.toString(i)+",");
            }
            bw.newLine();
            Date d=new Date();
            SimpleDateFormat sdf=new SimpleDateFormat("yyyy-mm-dd hh:mm:ss");
            bw.write(sdf.format(d));
            bw.close();
    }
}