AgWordSmith:
ESTÁ BEM! Eu estou tentando obter o programa para reconhecer a letra "E" para sair do loop while. Imprimir minhas declarações terminando e, em seguida, o programa é feito! Sobre! É isso aí! Para testar isto, estou apenas tentando sair assim que o prompt de me pede para colocar uma carta, mas não importa o que ele não vai reconhecer que ou qualquer carta que eu mude para (que não é D ou W) Tentei
- toUpperCase (), tanto após a entrada e com a nextLine () Método
- while (! DepORWith.equals ( "E") ||! DepORWith.equals ( "E"))
- while (! DepORWith.equals ( "E") &&! DepORWith.equals ( "e"))
- Alternando os casos sempre que maneira
- Tentando mudar tudo para tipos CHAR (grande erro)
- colocando uma carta como um local reservado e, em seguida, ele vai apenas mudar
- Usando .equalsIgnoreCase () com estes 'soluções'
- Usando .isEmpty ()
Eu tentei tanto que eu não me lembro. Alguns destes 'solução' acabou looping as perguntas para sempre, não importa a minha entrada. Vou pressionar E, obter o meu próprio erro, pressione E novamente e ele faz um loop meu erro. Deus, preciso de ajuda por favor.
Eu só preciso de imprensa E, imprima a não instruções de loop, e, em seguida, sai do programa. Estou colocando todo o código para baixo para análise completa por favor. Eu não sou avançado com Java isto é para uma introdução ao Java Class, eu realmente só sabe o básico
import java.util.Scanner ;
import java.io.* ;
public class IOExam {
public static void main(String[] args) throws IOException
{
double Deposit = 0;
boolean DepStop = false;
int DEPTransactionNUM = 0;
double DepTotal = 0;
double Withdrawal = 0;
boolean WithStop = false;
int WITHTransactionNUM = 0;
double WithTotal = 0;
Scanner keyboard = new Scanner(System.in);
//Ask For choice
String DepORWith = "" ;
while (!DepORWith.equals("E"))
{
System.out.print("Deposit or Withdrawal D/W ? (Press E to Exit):") ;
DepORWith = keyboard.nextLine() ;
if (DepORWith.equalsIgnoreCase("D"))
{
// Create Document First
PrintWriter DepositTXT = new PrintWriter ("Deposit.txt");
DepositTXT.println("Transaction Number \t Amount");
DepositTXT.println("--------------------------------------");
//Input Deposit
while (DepStop == false)
{
DEPTransactionNUM += 1;
System.out.print("Input amount for deposits:") ;
Deposit = keyboard.nextDouble() ;
keyboard.nextLine() ;
if (Deposit < 0)
{
System.out.print("---ERRROR ---\nInput NON NEGATIVE amount for deposits:") ;
Deposit = keyboard.nextDouble() ;
keyboard.nextLine() ;
}
DepTotal = DepTotal + Deposit;
DepositTXT.printf("\n\t%d \t\t\t $%,.2f", DEPTransactionNUM, Deposit);
String Confirmation ;
System.out.print("Would you Like to deposit again? Y/N: ");
Confirmation = keyboard.nextLine() ;
if (Confirmation.equalsIgnoreCase("y"))
{
DepStop = false;
}
else if (Confirmation.equalsIgnoreCase("n"))
{
DepStop = true;
}
else
{
System.out.println("---ERRROR ---\nINPUT Y OR N\nWould you Like to deposit again? Y/N") ;
Confirmation = keyboard.nextLine() ;
}
}
DepositTXT.println("\n--------------------------------------");
DepositTXT.printf("\nTotal \t\t\t $%,.2f", DepTotal);
DepositTXT.close();
}
else if (DepORWith.equalsIgnoreCase("W"))
{
// Create Document First
PrintWriter WithdrawalTXT = new PrintWriter ("Withdrawal.txt");
WithdrawalTXT.println("Transaction Number \t Amount");
WithdrawalTXT.println("--------------------------------------");
//Input Withdrawals
while (WithStop == false)
{
WITHTransactionNUM += 1;
System.out.print("Input amount for withdrawal:") ;
Withdrawal = keyboard.nextDouble() ;
keyboard.nextLine() ;
if (Withdrawal < 0)
{
System.out.print("---ERRROR ---\nInput NON NEGATIVE amount for withdrawal:") ;
Withdrawal = keyboard.nextDouble() ;
keyboard.nextLine() ;
}
WithTotal = WithTotal + Withdrawal;
WithdrawalTXT.printf("\n\t%d \t\t\t $%,.2f", WITHTransactionNUM, Withdrawal);
String Confirmation ;
System.out.print("Would you Like to withdrawal again? Y/N: ");
Confirmation = keyboard.nextLine() ;
if (Confirmation.equalsIgnoreCase("y"))
{
WithStop = false;
}
else if (Confirmation.equalsIgnoreCase("n"))
{
WithStop = true;
System.out.print("Deposit or Withdrawal D/W ? (Press E to Exit):") ;
DepORWith = keyboard.nextLine() ;
}
else
{
System.out.println("---ERRROR ---\nINPUT Y OR N\nWould you Like to withdrawal again? Y/N: ") ;
Confirmation = keyboard.nextLine() ;
}
}
WithdrawalTXT.println("\n--------------------------------------");
WithdrawalTXT.printf("\nTotal \t\t\t $%,.2f", DepTotal);
WithdrawalTXT.close();
}
else
{
System.out.print("---ERRROR ---\nINPUT D OR W OR E \n") ;
System.out.print("Deposit or Withdrawal D/W ?:") ;
DepORWith = keyboard.nextLine() ;
}
}
System.out.printf("Deposit Total: %,.2d \nWithdrawal Total: %,.2d",DepTotal, WithTotal) ;
System.out.print("\n----------------------------------") ;
System.out.print("\nThank you for Using Old National") ;
System.out.print("\n----------------------------------") ;
}
}
Arvind Kumar Avinash:
- Fazer o processamento necessário quando a entrada não é
Eoue - É melhor usar
do...whilepara evitar o usoDepORWith = keyboard.nextLine();duas vezes.
Fazê-lo da seguinte forma:
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Scanner;
public class Program {
public static void main(String[] args) throws IOException {
double Deposit = 0;
boolean DepStop = false;
int DEPTransactionNUM = 0;
double DepTotal = 0;
double Withdrawal = 0;
boolean WithStop = false;
int WITHTransactionNUM = 0;
double WithTotal = 0;
Scanner keyboard = new Scanner(System.in);
// Ask For choice
String DepORWith = "";
do {
System.out.print("Deposit or Withdrawal D/W ? (Press E to Exit):");
DepORWith = keyboard.nextLine();
if (!(DepORWith.equalsIgnoreCase("D") || DepORWith.equalsIgnoreCase("W"))) {
if (!DepORWith.equalsIgnoreCase("E")) {
System.out.println("This is not a valid input");
} else {
System.out.println("Goodbye!");
}
} else if (!DepORWith.equalsIgnoreCase("E")) {
if (DepORWith.equalsIgnoreCase("D")) {
// Create Document First
PrintWriter DepositTXT = new PrintWriter("Deposit.txt");
DepositTXT.println("Transaction Number \t Amount");
DepositTXT.println("--------------------------------------");
// Input Deposit
while (DepStop == false) {
DEPTransactionNUM += 1;
System.out.print("Input amount for deposits:");
Deposit = keyboard.nextDouble();
keyboard.nextLine();
if (Deposit < 0) {
System.out.print("---ERRROR ---\nInput NON NEGATIVE amount for deposits:");
Deposit = keyboard.nextDouble();
keyboard.nextLine();
}
DepTotal = DepTotal + Deposit;
DepositTXT.printf("\n\t%d \t\t\t $%,.2f", DEPTransactionNUM, Deposit);
String Confirmation;
System.out.print("Would you Like to deposit again? Y/N: ");
Confirmation = keyboard.nextLine();
if (Confirmation.equalsIgnoreCase("y")) {
DepStop = false;
} else if (Confirmation.equalsIgnoreCase("n")) {
DepStop = true;
} else {
System.out.println("---ERRROR ---\nINPUT Y OR N\nWould you Like to deposit again? Y/N");
Confirmation = keyboard.nextLine();
}
}
DepositTXT.println("\n--------------------------------------");
DepositTXT.printf("\nTotal \t\t\t $%,.2f", DepTotal);
DepositTXT.close();
} else if (DepORWith.equalsIgnoreCase("W")) {
// Create Document First
PrintWriter WithdrawalTXT = new PrintWriter("Withdrawal.txt");
WithdrawalTXT.println("Transaction Number \t Amount");
WithdrawalTXT.println("--------------------------------------");
// Input Withdrawals
while (WithStop == false) {
WITHTransactionNUM += 1;
System.out.print("Input amount for withdrawal:");
Withdrawal = keyboard.nextDouble();
keyboard.nextLine();
if (Withdrawal < 0) {
System.out.print("---ERRROR ---\nInput NON NEGATIVE amount for withdrawal:");
Withdrawal = keyboard.nextDouble();
keyboard.nextLine();
}
WithTotal = WithTotal + Withdrawal;
WithdrawalTXT.printf("\n\t%d \t\t\t $%,.2f", WITHTransactionNUM, Withdrawal);
String Confirmation;
System.out.print("Would you Like to withdrawal again? Y/N: ");
Confirmation = keyboard.nextLine();
if (Confirmation.equalsIgnoreCase("y")) {
WithStop = false;
} else if (Confirmation.equalsIgnoreCase("n")) {
WithStop = true;
System.out.print("Deposit or Withdrawal D/W ? (Press E to Exit):");
DepORWith = keyboard.nextLine();
} else {
System.out
.println("---ERRROR ---\nINPUT Y OR N\nWould you Like to withdrawal again? Y/N: ");
Confirmation = keyboard.nextLine();
}
}
WithdrawalTXT.println("\n--------------------------------------");
WithdrawalTXT.printf("\nTotal \t\t\t $%,.2f", DepTotal);
WithdrawalTXT.close();
}
System.out.printf("Deposit Total: %,.2d \nWithdrawal Total: %,.2d", DepTotal, WithTotal);
System.out.print("\n----------------------------------");
System.out.print("\nThank you for Using Old National");
System.out.print("\n----------------------------------");
} else {
System.out.println("Goodbye!");
}
} while (!DepORWith.equalsIgnoreCase("E"));
}
}
Uma corrida de amostra:
Deposit or Withdrawal D/W ? (Press E to Exit):e
Goodbye!
Outra corrida de amostra:
Deposit or Withdrawal D/W ? (Press E to Exit):x
This is not a valid input
Deposit or Withdrawal D/W ? (Press E to Exit):e
Goodbye!
Outra corrida de amostra:
Deposit or Withdrawal D/W ? (Press E to Exit):d
Input amount for deposits:
Outra corrida de amostra:
Deposit or Withdrawal D/W ? (Press E to Exit):x
This is not a valid input
Deposit or Withdrawal D/W ? (Press E to Exit):d
Input amount for deposits:
Além disso, altere os nomes de variáveis no código a seguir Java convenções de nomenclatura por exemplo, double Depositdeve ser double deposit.
Sinta-se livre para comentar em caso de qualquer dúvida / questão.