Thread: Writing data get from methods to txt file

Hi,
I have written a simple converter from Celsius to Fahrenheit and vise versa. I want write to file what conversion was chosen by user, what value was entered and result.
There is my code:
User input class

package Converter.learning;
 
//This class handles user input
 
 
import java.util.Scanner;
 
public class UserInput {
 
	public UserInput(){
		//dataInput();
	}
 
	//declaring variables
	float temp;
	//Creating scanner for reading user input
	Scanner inputTemp= new Scanner(System.in);
 
 
	//Method that does handles input
	public float dataInput(){
 
		System.out.println("Enter a numer");
 
		//Checking if an input is a float
		while (!inputTemp.hasNextFloat()){
			System.out.println("You have entered wrong type. Please enter number!");
			inputTemp.next();
		}
		temp = inputTemp.nextFloat();
		//Closing Scanner
		inputTemp.close();
		return temp ;
	}
 
 
 
}

Conversion Class

package Converter.learning;
 
//This class converts C to F and vice versa
 
public class Conversion {
	//declaring variables
	float result; 
	float C;
	float F;
	//Constructor
	public Conversion(){
		//convertToC(F);
		//convertToF(C);
		//print();
 
	}
	//Method that does conversion from C to F 
	public float convertToF (float C){
		return result = C * 9/5 + 32;
	}
 
	//Method that does conversion from F to C 
		public float convertToC (float F){
			return result = (F - 32) * 5/9;
		}
 
		public void print(){
			System.out.println("Result is: " + result);
		}
}

Main Class

package Converter.learning;
 
 
import java.util.Scanner;
 
/*
 * Program is a simple converter that converts temperature. Celsius to
 * Fahrenheit and oposite. 
 * Version 3.4 
 */ 
 
 
public class Main {
 
	public static void main(String[] args) {
		String s ;
		UserInput input = new UserInput();
		Conversion conversion = new Conversion();
		System.out.println("To convert Celsius to Fahrenheit press C, To convert Fahrenheit to Celsius press F ");
		//Creating a scanner that enables conversion mode
		Scanner scan = new Scanner(System.in);
		while(!scan.hasNext("[CF]")){
			System.out.println("wrong input, please enter C or F");
			scan.next();
			//mySet.add();
		}
		//mySet.add(s = scan.next());
		s = scan.next();
		switch(s){
		case "C":
			System.out.println("Conversion To Fahrenheit");
 
			conversion.convertToF(input.dataInput());
			conversion.print();
			scan.close();
			break;
		case "F":
			System.out.println("Conversion To Celsius");
			conversion.convertToC(input.dataInput());
			conversion.print();
			scan.close();
 
			break;
		default:
			break;
		}
 
 
 
		//input.dataInput();
		//System.out.println(input.temp);
 
 
 
	}
 
}

Do you have any ideas?

Welcome to the Forum! Please read this topic to learn useful tips for newcomers.

It's not clear what help you need. Can you focus on what you need help with and ask specific questions? How do I . . . ? Here's what I tried: I'm getting the following results, errors, etc. but I want this to happen.

Originally Posted by GregBrannon

Welcome to the Forum! Please read this topic to learn useful tips for newcomers.

It's not clear what help you need. Can you focus on what you need help with and ask specific questions? How do I . . . ? Here's what I tried: I'm getting the following results, errors, etc. but I want this to happen.

I am trying to write data to file. For example: want temperature was entered and what results I get. I have method void print() in Class Conversion and I want to get information from method void print() and put in a file. I have already written Class that writes to files but I don't know how to integrate into my existing code.
Here Class that should write data to file

package Converter.learning;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
 
 
public class ManipulatingFiles {
 
	String myFile ="file.txt";
	String text = "Bandymas1_";
	File f = new File("/home/dainius/", myFile);	
	public void createFile() {
 
		//
 
		if(!f.exists()){			
			try {
				f.mkdir();
				f.createNewFile();
				System.out.print("Success");
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}else{
		System.out.println("File already exits, overding it");
 
	}
}
	public boolean writeToFile() throws IOException{
		FileWriter writer = new FileWriter(f);
		writer.write(text);
		writer.flush();
		writer.close();
		return true;
	}

Using a class:

Create an instance of it, as in

ManipulatingFiles manFiles = new ManipulatingFiles();

Then use the instance as needed to access the methods:

manFiles.writeToFile( textToWriteToFile );

Your method, writeToFile(), accepts no parameters, so is not very useful. Try rewriting the method to accept the data you want to write to the file.

Originally Posted by GregBrannon

Using a class:

Create an instance of it, as in

ManipulatingFiles manFiles = new ManipulatingFiles();

Then use the instance as needed to access the methods:

manFiles.writeToFile( textToWriteToFile );

Your method, writeToFile(), accepts no parameters, so is not very useful. Try rewriting the method to accept the data you want to write to the file.

Thank you. I modified method writeToFile. And now it is working.

Glad to help.