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49 lines (44 loc) · 1.9 KB
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import java.util.Arrays;
import java.util.Map;
import com.h2.BestLoanRates;
import com.h2.MortgageCalculator;
import com.h2.SavingsCalculator;
public class Finance {
public final static String BEST_LOAN_RATES = "bestLoanRates";
public final static String SAVINGS_CALCULATOR = "savingsCalculator";
public final static String MORTGAGE_CALCULATOR = "mortgageCalculator";
final 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;
}
return false;
}
private static void executeCommand(String command, String[] arguments) {
switch (command) {
case BEST_LOAN_RATES: System.out.print("Finding best loan rates ..."); System.out.print("\n"); BestLoanRates.main(arguments); return;
case SAVINGS_CALCULATOR: System.out.print("Finding your net savings ..."); System.out.print("\n"); SavingsCalculator.main(arguments); return;
case MORTGAGE_CALCULATOR: System.out.print("Finding your monthly payment ..."); System.out.print("\n"); MortgageCalculator.main(arguments); return;
}
}
public static void main(String[] args) {
String command = args[0];
if (!commandsToUsage.containsKey(command)) {
System.out.print(command + ": command not found");
System.out.print("\n");
return;
}
boolean isValidCommand = validateCommandArguments(args);
if (!isValidCommand) {
System.out.print(commandsToUsage.get(args[0]));
System.out.print("\n");
return;
}
executeCommand(command, Arrays.copyOfRange(args, 1, args.length));
}
}