Hello, Please help write program in JAVA PROGRAM SHOULD DO THE FOLLOWING: 1) Ask

Question

Hello,

Please help write program in JAVA

PROGRAM SHOULD DO THE FOLLOWING:

1) Asks the user to enter a positive integer greater than 0

2) Validates that the entry is a positive integer

3) Outputs the digits in reverse order with a space separating the digits

4) Outputs the even digits not in reverse order with a space separating the digits (consider zero to be even)

5) Outputs the odd digits not in reverse order with a space separating the digits

6) Allows user is to repeat/continue the program as many times as he/she wants

7) Keeps a record in a txt file named outDataFile.txt with the history of all numbers entered and the associated results, in the following format:

the original number is 1023

the number reversed 3 2 0 1

the even digits are 0 2

the odd digits are 1 3

SPECIFIC REQUIREMENTS:

The program must have the following four void methods:

validate //validate user input

reverse // output reverse digits to screen and txt file

even //output even digits to screen and txt file

odd //output odd digits to screen and txt file

SUGGESTION from Professor:

To make the validate method return a string as follow:

public static String validate (String userAnswer);

Then do it.

However, the odd, even and reverse methods must be void.

BELOW ARE THE SCREENSHOTS OF WORKING PROGRAM:

Explanation / Answer

import java.util.*;
import java.io.FileWriter;
import java.io.IOException;
public class Digits {
   static FileWriter writer;
    //writer.write("Hello World");
   public static String validate(String userAnswer){
       for(int i=0;i<userAnswer.length();i++){
           if(!Character.isDigit(userAnswer.charAt(i))) return "";
       }
       System.out.print("the original number is "+userAnswer+" ");
       try{
           writer.write("the original number is "+userAnswer+" ");
       }
       catch(Exception e) {
           System.out.println("Unable to write in file. ");
       }
       return userAnswer;
   }
   public static void reverse(String str){
       String rev ="";
       for(int i=0;i<str.length();i++){
           rev = " "+str.charAt(i) + rev;
       }
       System.out.print("the number reversed"+rev+" ");
       try{
           writer.write("the number reversed"+rev+" ");   }
       catch(Exception e) {
           System.out.println("Unable to write in file. ");
       }
      
   }
  
  
   public static void evendigits(String str){
           String evendigits ="";
       for(int i=0;i<str.length();i++){
           if(str.charAt(i)%2==0) evendigits = evendigits+ " " + str.charAt(i) ;
       }
       System.out.print("the even digits are"+evendigits+" ");
       try{
               writer.write("the even digits are"+evendigits+" ");   }
       catch(Exception e) {
           System.out.println("Unable to write in file. ");
       }
   }
  
   public static void odddigits(String str){
       String odddigits ="";
       for(int i=0;i<str.length();i++){
           if(str.charAt(i)%2==1) odddigits = odddigits+ " " + str.charAt(i) ;
       }
       System.out.print("the odd digits are"+odddigits+" ");
       try{
           writer.write("the odd digits are"+odddigits+" ");   }
       catch(Exception e) {
           System.out.println("Unable to write in file. ");
       }
      
   }
    public static void main(String[] args) {
    try{
            writer = new FileWriter("outDataFile.txt", true);
   }
   catch(Exception e){
       System.out.println("Unable to open file for writing. ");
   }
       
        Scanner sc = new Scanner(System.in);
        String response;
       do{
            System.out.println("Enter an integer and press <Enter>");
           String str= sc.nextLine();
           while(str!=validate(str)){
               System.out.println("Invalid entry, try again");
               str= sc.nextLine();
           }
           reverse(str);
           evendigits(str);
           odddigits(str);
           System.out.print("y/Y to continue, any else to exit ");
           response=sc.nextLine();
           }while(response=="y" || response=="Y");
           try{
                writer.close();
           }
           catch(Exception e){
               System.out.println("Unable to open file for writing. ");
           }
    }
}

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