What are input processes for the Currency Conversion project?

Answer 1

It really depends where are you inputs coming from.

From the keyboard by prompting the user:
import java.util.Scanner;

System.out.print("input: ");
Scanner scan = new Scanner(System.in);
int input = scan.nextInt();

// Do your converting with the input

From a file:

import java.io.FileReader;
import java.util.Scanner;

Scanner scan = new Scanner(new FileReader("inputFile.dat"); // the input data file
int input = scan.nextInt(); //similar to reading from keyboard since the file is now your input source

//Do your converting

scan.close(); // remember to close your files that you opened, good Java conventions