Question

Java Programming:

In the program shown below, I want to print the result in the output file. The main static method calls a method, displaySum which adds two integers and prints the result (sum). The problem is that I am not able to use "outputFile.print()" inside displaySum to print the content as the output file. I also want to display the content of two other methods, but I am facing this difficulty.

** DisplayOutput.java **

import java.io.*;
public class DisplayOutput
{
   public static void main(String[] args) throws IOException
   {
       FileWriter fw = new FileWriter("output.txt");
       PrintWriter outputFile = new PrintWriter(fw);
      
       outputFile.println("Suppose two inetegers are 2 and 3.");
       outputFile.println("Display the sum of two inetegers (2 and 3).");
       displaySum(2,3);
       outputFile.close();
   }
  
   private static void displaySum(int n1, int n2)
   {
       int sum = n1 + n2;
      
       outputFile.print("Sum of two integers (2 and 3) is: " + sum); // Error: outputFile cannot be resolved
   }  
}

Answer 1

This can be solved in 2 ways, I have provided both solutions:

Solution 1)

Pass the  PrintWriter outputFile, as an argument to method displaySum

---------DisplayOutput.java---------------------

import java.io.*;

public class DisplayOutput
{
public static void main(String[] args) throws IOException
{
FileWriter fw = new FileWriter("output.txt");
PrintWriter outputFile = new PrintWriter(fw);

outputFile.println("Suppose two inetegers are 2 and 3.");
outputFile.println("Display the sum of two inetegers (2 and 3).");
displaySum(2,3, outputFile); //Pass the outpuFile argument to displaySum Method
outputFile.close();
}

private static void displaySum(int n1, int n2, PrintWriter outputFile)
{
int sum = n1 + n2;
outputFile.print("Sum of two integers (2 and 3) is: " + sum);
}
}

---------------------------------------------------------------------------------

Solution 2)

Declare the FileWriter and PrintWriter objects outside main, so they can be accessed in all methods

---------DisplayOutput.java---------------------

import java.io.*;

public class DisplayOutput
{
   static FileWriter fw ;//Declare file and print objects outside, so it can be accessed in all methods
   static PrintWriter outputFile;
   public static void main(String[] args) throws IOException
   {
       fw = new FileWriter("output.txt");
       outputFile = new PrintWriter(fw);

       outputFile.println("Suppose two inetegers are 2 and 3.");
       outputFile.println("Display the sum of two inetegers (2 and 3).");
       displaySum(2,3); //Pass the outpuFile argument to displaySum Method
       outputFile.close();
   }

   private static void displaySum(int n1, int n2)
   {
       int sum = n1 + n2;
       outputFile.print("Sum of two integers (2 and 3) is: " + sum);
   }
}

-------------------Output---------------------

-----------------------------------------

I hope this helps you,

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Thanks for the opportunity