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63 lines (57 loc) · 2.23 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";
public 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.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);
return;
default:
return;
}
}
public static void main(String[] args){
String command=args[0];
if (!commandsToUsage.containsKey(command))
{
System.out.println(command + ": command not found");
return;
}
boolean isValidCommand=validateCommandArguments(args);
if (!isValidCommand){
System.out.println(commandsToUsage.get(command));
return;
}
executeCommand(command, Arrays.copyOfRange(args,1,args.length));
}
}