Question

我将在下面发布完整的代码。在我上一篇文章之后，我试图让它自动格式化。我希望阅读起来并不难。无论如何......问题......

我有三个问题。

1st）第113行

BufferedReader withdrawFile = Files.newBufferedReader（Withdrawals，Charset.defaultCharset（））;

出现错误“令牌上的语法错误”;“，{此标记后的预期”。

我根本不明白这个错误。如果你看第94行，你会看到我为“存款”编写了相同的代码行，但是没有相同的问题。

第2行）第119行

userAccount.setWithdrawal（userWithdrawal）;

要求我为userAccount创建一个局部变量时出错。我认为这与上面的错误相关，但我试过寻找大括号或其他东西。我找不到任何东西。

第3次）我的二传手错误？

账户金额应该以610.17美元结束。它以500.00结尾文件阅读器应该编辑帐户中的金额上涨$ 110.17，但它不是，我不知道为什么。

此外，欢迎任何有关如何使我的代码更清洁的建议。

 import java.io.BufferedReader;
 import java.io.IOException;
 import java.nio.charset.Charset;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import javax.swing.JOptionPane;


public class Savings {
     private double accountAmount;
     private double interestRate; 
     private int months;

//Provides access to interestRate, accountAmount, and months with getters
// and setters
public void setBeginning(double testAccount){
    this.accountAmount= testAccount;}

public void setAccountAmount(double userInput){
    this.accountAmount = userInput;
}

public void setWithdrawal(double withdrawal){
    this.accountAmount = (accountAmount- withdrawal) ;}

public void setDeposit(double deposit){
    this.accountAmount = (accountAmount + deposit);}

public void setMonths(int userMonths){
    this.months = userMonths;}

public void setInterest(double userInterest){
    this.interestRate= userInterest;}

public int getMonths(){
    return this.months;}

public double getInterest(){
    return this.interestRate;}

public double getAccount(){
    return this.accountAmount;      }


 // Main method. Creates a savings account (userAccount) gets an interest rate and # of months
 //from the user.
 // Reads pre-written deposit and withdrawal files, account should end up at $610.17

public static void main (String [] args)throws IOException{
     String stringInterest, stringMonths;
     int userMonths;
     double userInterest, preInterestAccount;

     Savings userAccount = new Savings();

     stringInterest = JOptionPane.showInputDialog("What is the monthly interest rate "
        + "on your account?\n Put it in decimal terms.\n (Ex: 1.0 would be 100%)");

 if (stringInterest == null) {
    System.exit(0); }
     while (stringInterest.trim().length()== 0 || Double.parseDouble(stringInterest) < 0){
         stringInterest= JOptionPane.showInputDialog("You did not enter a valid value.\n" +
        "Please enter a valid value for interest.");
         if (stringInterest == null){
             System.exit(0);} 
     }//ends the while

stringMonths = JOptionPane.showInputDialog("How many months will the money be "
        + "in your account?");
if (stringMonths == null) {
    System.exit(0); }
while (stringMonths.trim().length()== 0 || Integer.parseInt(stringMonths) < 0){
    stringInterest= JOptionPane.showInputDialog("You did not enter a valid value.\n" +
        "Please enter a valid value for interest.");
    if (stringInterest == null){
        System.exit(0);} 
}//ends the while

userMonths=Integer.parseInt(stringMonths);
userInterest=Double.parseDouble(stringInterest);

userAccount.setMonths(userMonths);
userAccount.setInterest(userInterest);;
userAccount.setBeginning(500.00);

Path Deposists = Paths.get("C:\\Users\\Owner\\workspace\\BankAccount\\"
        + "src\\Deposists.txt");


BufferedReader depositFile = Files.newBufferedReader(Deposists, Charset.defaultCharset());
String dLine;

// read each line
        while((dLine = depositFile.readLine()) != null) {
            double userDeposit;

            userDeposit=Double.parseDouble(dLine);
            userAccount.setDeposit(userDeposit);
            }
        depositFile.close();}



 Path Withdrawals = Paths.get("C:\\Users\\Owner\\workspace\\BankAccount\\"
                + "src\\Withdrawals.txt");

 String wLine;

 BufferedReader withdrawalFile = Files.newBufferedReader(Withdrawals, Charset.defaultCharset());

     while((wLine = withdrawalFile.readLine()) != null) {
                    double userWithdrawal;

                    userWithdrawal=Double.parseDouble(wLine);
                    userAccount.setWithdrawal(userWithdrawal);
                    }
                withdrawalFile.close();


        preInterestAccount = userAccount.getAccount();
        userAccount.setAccountAmount((userAccount.getAccount()*(1+userAccount.getInterest())*
        (userAccount.getMonths())));

JOptionPane.showMessageDialog(null, "The interest rate is "+ (userAccount.getInterest()*100)
        +"%.\n"+ "Your money was in the account for " + userAccount.getMonths()+" months.\n"
        + "The balance on your account before interest is "+ preInterestAccount + ".\n"
        + "The final balance of your account is  "+ (userAccount.getAccount()) +".");

    }//ends main method

}

Answer 1

下面的while循环中有两个右括号。这导致第113行和第119行出错。只需在depositFile.close();之后删除括号。

    // read each line
    while((dLine = depositFile.readLine()) != null) {
        double userDeposit;

        userDeposit=Double.parseDouble(dLine);
        userAccount.setDeposit(userDeposit);
        } // <--------------- HERE --------------------
    depositFile.close();} // <------------ AND HERE ---

此外，你有一个不必要的分号，这不会导致错误，但它不应该在那里：

userAccount.setMonths(userMonths);
userAccount.setInterest(userInterest);; //<-------- HERE
userAccount.setBeginning(500.00);

为了使您的代码更清晰：如果您使用的是IDE（如Eclipse），那么应该有一个自动格式化代码的选项。在Eclipse中它是Source->format。

语法错误，文件读取器问题，setter问题。复杂的问题

1 个答案: