運行和編譯Java代碼相關問題時出錯

Question

運行代碼的問題

不斷獲得非法逃逸角色

聲明變量，以及似乎正確聲明的字符串。

 import java.swing.*;
 import java.text.DecimalFormat;

 public class TWP1Project {
    private static Object dataIn;


public static void main(String[] args) {
    // declare class variables
    int hours;
    double fee, rate, tuition;
    // call methods
    displayWelcome();
    hours = getHours();
    rate = getRate();
    tuition = calcTuition(hours);
    fee = myArray(1);
    diplayTotal(tuition+fee);

}
public static void displayWelcome()
{
     System.out.println("\Welcome to the Tuition and Fees Calculator");
}

} 

public static int getHours()
 {
      //declare variables
     String strHours;
     int hours = 0;

     //prompts user for input
     System.out.println("Enter the number of hours accrued in a class.");

     hours = dataIn.readLine();

     try
        {
            hours = Integer.parseInt(strHours);   
        }
     catch{NumberFormatException e};
     JOptionPane.showMessageDialog{null,"Your entry was not in the proper format.",
             "Error"JOptionPane.INFORMATION_MESSAGE};
             {
                 System.out.println("Please input whole numbers only");
             }
             return hours;
 }

 //the getRate() method ask user to input the rate per credit hours.
  public static double getRate()
  {
      int hours =12;
      if (hours>12)
          System.out.println("calculate the rate per credit hours");
      else
          if (hours<12) 
               System.out.println("credit hours is inaccurate");
      else
              System.out.println("zero");
  }
}
  return rate;
  //the calcTuition() allowed to calculate tuition.
  public static double calcTuition()
  {`enter code here`
      int hours
      double rate =0.0;
      double rate * hours         
  }
  return tuition;
  //
  public static myArray(int tuition)
  {
      int tuition
      double fee
  }
  return fee

如果可以或需要一些提示，則需要糾正方面的幫助。 在Java中正確運行它時遇到問題。

Answer 1

從System.out.println("\\Welcome to the Tuition and Fees Calculator");刪除\\ System.out.println("\\Welcome to the Tuition and Fees Calculator");

Answer 2

或者，如果您在消息中需要“ \\”，請在輸入時加上雙反斜杠。

嘗試這個：

public static void displayWelcome()
{
     System.out.println("\\Welcome to the Tuition and Fees Calculator");
}

更多信息： https : //docs.oracle.com/javase/tutorial/java/data/characters.html

Answer 3

您有多個錯誤，我已經解決了其中的一些錯誤，並給出了一些指示...請在編寫代碼時使用Netbeans或Eclipse之類的IDE ...我已經將其他一些留給您了，並說明了什么你應該對他們做

import java.io.Console;
import java.text.DecimalFormat;

import javax.swing.JOptionPane;

public class TWP1Project {
    private static Console dataIn; // if you want to read from keyboard or
                                    // something, this should be of type
                                    // Scanner, not Object - to use it you need
                                    // to also add import java.util.Scanner;

    public static void main(String[] args) {
        // declare class variables
        int hours;
        double fee, rate, tuition;
        // call methods
        displayWelcome();
        hours = getHours();
        rate = getRate();
        tuition = calcTuition(hours);
        fee = myArray(1); // you have
        diplayTotal(tuition + fee);

    }

    public static void displayWelcome() {
        System.out.println("Welcome to the Tuition and Fees Calculator"); // no
                                                                            // backslash
    } // erased one brace this

    public static int getHours() {
        // declare variables
        String strHours; // you didn't initialize strHours
        int hours = 0;

        // prompts user for input
        System.out.println("Enter the number of hours accrued in a class.");
        dataIn = System.console(); // need to initialize in order to read lines
                                    // from it
        hours = Integer.parseInt(dataIn.readLine()); // this doesn't prompt for
                                                        // input, you need a
                                                        // scanner object

        try {
            hours = Integer.parseInt(strHours); // didn't initialize strHours
        } catch (NumberFormatException e) {
        } // pay attention here
        JOptionPane.showMessageDialog(null,
                "Your entry was not in the proper format.", "Error",
                JOptionPane.INFORMATION_MESSAGE); // you need ( , not {
        {
            System.out.println("Please input whole numbers only");
        }
        return hours;
    }

    // the getRate() method ask user to input the rate per credit hours.
    public static double getRate() {
        int hours = 12;
        if (hours > 12)
            System.out.println("calculate the rate per credit hours");
        else if (hours < 12)
            System.out.println("credit hours is inaccurate");
        else
            System.out.println("zero");
        return rate; // you need to initialize the rate somewhere...i'll let
                        // this for you
    }

    // the calcTuition() allowed to calculate tuition.
    public static double calcTuition() {
        int hours;
        double rate = 0.0;
        double tuition = rate * hours; // i don't actually know what you meant
                                        // here, but you should declare the
                                        // tuition and then initialize it
        return tuition;
    }

    //
    public static myArray(int tuition) // you forgot the return type
    {
        // don't know what you meant here, but again, initialize
        double fee;

        return fee;
    }
}