Notes

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class maldonadoA_OSpgm2
{// open maldonadoA_OSpgm2

public static int hexToDecimal(String hexNumber)
{// open hexToDecimal
int decimalNumber = 0;
int power = hexNumber.length() - 1;

for (char c : hexNumber.toCharArray())
{// open for
int digit = Character.digit(c, 16);
decimalNumber += (int) (digit * Math.pow(16, power));
power--;
}// close for
return decimalNumber;
}// close hexToDecimal

public static String decimalToBinary(int decimalNumber)
{// open decimalToBinary
StringBuilder binaryNumber = new StringBuilder();
while (decimalNumber > 0)
{// open while
int remainder = decimalNumber % 2;
binaryNumber.insert(0, remainder);
decimalNumber /= 2;
}// close while
return binaryNumber.toString();
}//close decimalToBinary

public static void main(String[] args)
{//open main
try
{// open try
Scanner inputFile = new Scanner(new File("RAMerrors8x4f.6"));
System.out.printf("%s", "hexNumber _ binaryNumber _ decimalNumbern");

while (inputFile.hasNextLine())
{// open while
String hexNumber = inputFile.nextLine().toUpperCase();

int decimalNumber = hexToDecimal(hexNumber);
String binaryNumber = decimalToBinary(decimalNumber);

System.out.printf("%s", hexNumber + " = " + binaryNumber + " = " + decimalNumber + "n");
} //close while
inputFile.close();
}// close try

catch (FileNotFoundException e)
{// open catch
System.err.println("File not found: " + e.getMessage());
}// close catch
}// close main
}// close maldonadoA_OSpgm2