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67 lines (61 loc) · 2.21 KB
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import com.h2.*;
import java.util.Arrays;
import java.util.Map;
public class Finance {
final public static String BEST_LOAN_RATES = "bestLoanRates";
final public static String SAVINGS_CALCULATOR = "savingsCalculator";
final public static String MORTGAGE_CALCULATOR = "mortgageCalculator";
final public static Map<String,String> commandsToUsage = Map.of(BEST_LOAN_RATES, "usage: bestLoanRates",
SAVINGS_CALCULATOR, "usage: savingsCalculator <credits separated by ','> <debits separated by ','>",
MORTGAGE_CALCULATOR, "usage: mortgageCalculator <loanAmount> <termInYears> <annualRate>");
private static boolean validateCommandArguments(String[] args)
{
switch (args[0])
{
case BEST_LOAN_RATES:
return args.length == 1;
case SAVINGS_CALCULATOR:
return args.length == 3;
case MORTGAGE_CALCULATOR:
return args.length == 4;
default:
return false;
}
}
private static void executeCommand(String command, String[] arguments)
{
switch (command)
{
case BEST_LOAN_RATES:
System.out.println("Finding best loan rates ...");
BestLoanRates.main(arguments);
return;
case SAVINGS_CALCULATOR:
System.out.println("Finding your net savings ...");
SavingsCalculator.main(arguments);
return;
case MORTGAGE_CALCULATOR:
System.out.println("Finding your monthly payment ...");
MortgageCalculator.main(arguments);
}
}
public static void main(String[] args) {
String command = args[0];
if (commandsToUsage.containsKey(command))
{
boolean isValidCommand=validateCommandArguments(args);
if (isValidCommand)
{
executeCommand(command, Arrays.copyOfRange(args, 1, args.length));
}
else
{
System.out.println(commandsToUsage.get(command));
}
}
else
{
System.out.println(command + ": command not found");
}
}
}