Question

是的，这是学校的作业！所以没有答案请只是一个工作方向：）

此代码应该是获取星期几，设置日期和打印日期。此外，它需要将一天增加一个并在第二天返回，将给定的一天减少一个并返回前一天，然后按用户给定的数量增加一天，并返回x天的天数。

import java.util.Scanner;

public  class MyDay
{
private int tempDays;
private String day;

  public String toString()
  {
     return (day);
   }

//Creates the method setDay, Uses switch statements to determine the day.     
   public void setDay(int tempDay)
   {
   String day;

     switch (tempDay){
     case 1: day= "Sun";
        break;
     case 2: day= "Mon";
        break;
     case 3: day= "Tues";
        break;
     case 4: day= "Wednes";
        break;
     case 5: day= "Thurs";
        break;
     case 6: day= "Fri";
        break;
     case 7: day= "Sat";
        break;
        }
     return (day);         
    }

 //Returns the day as a string.        
    public Day setName(String day)
    {
     day = tempDay;        
     return day;
    }

//Creates the method printDay, returns the string day.
    public void printDay()
    {      
     return (day);
     }

//Creates the method nextDay, Determines the next day.
   public void nextDay()
      {  
         nextDay=(tempDay+1)%7; 
         tempDay(nextDay);
         printDay();
      }

//Creates the method lastDay, Determines the previous day.        
   public void lastDay()
      {        
        lastDay=(tempDay-1)%7;     
        tempDay(lastDay);
        printDay(); 
      }

//Creates the method getDay, Determines the next day it will be based on the     users input.
   public void getDay()
      {
      static Scanner console= new Scanner(System.in);
      int x=0;
      int y=0;
         System.out.println("The next number you will be prompted to enter will return\n"+
                            "what day it will be in that many days.");            
         System.out.println("Enter a number using numeric keys only.");
         x= console.nextInt();
         y = day +(x);
         Day = y %7;
         tempDay(getDay);
         printDay();
      }

//Allows Day to be minpulated.
   public day()
      {
         tempDay(0);
      }

//converts Day into a string.
   public day (int tempDay)
     {
         tempDay(day);
     }


   public static void main(String[] args)
   {
   //Import Scanner as imput device.
     static Scanner console= new Scanner(System.in);

  System.out.println("Please enter the day you wish to set.");
  System.out.println("Enter 1 for Sunday\n"+"Enter 2 for Monday\n"+"Enter 3 for Tuesday\n"+
                        "Enter 4 for Wednesday\n"+"Enter 5 for Thursday\n"+"Enter 6 for Friday\n"+
                        "Enter 7 for Saturday");
    tempDay= console.nextInt();

    Day myDay = new Day(tempDay);
    System.out.println();

    System.out.println("Today is: ");
    myDay.printDay();

    System.out.println("Tomorrow is: ");
    myDay.nextDay();

    System.out.println("Yesterday was: ");
    myDay.lastDay();

    System.out.println("In "+ x +"day(s), it will be: ");
    myDay.getDay();

   }
}

我收到的错误消息是：

 ----jGRASP exec: javac -g MyDay.java

MyDay.java:69: error: illegal start of expression
          static Scanner console= new Scanner(System.in);
          ^
MyDay.java:83: error: invalid method declaration; return type required
       public day()
              ^
MyDay.java:89: error: invalid method declaration; return type required
       public day (int tempDay)
              ^
MyDay.java:98: error: illegal start of expression
     static Scanner console= new Scanner(System.in);
     ^
4 errors

 ----jGRASP wedge2: exit code for process is 1.
 ----jGRASP: operation complete.

Answer 1

MyDay.java:69: error: illegal start of expression
static Scanner console= new Scanner(System.in);

在Java中，局部变量不能是静态的。只需删除static。

MyDay.java:83: error: invalid method declaration; return type required
public day()

您需要为每个方法声明一个返回类型。如果它没有返回任何内容，请使用void：public void day()。

Answer 2

一旦您习惯了这些问题，错误信息就可以解释这些问题：

第一个和第四个错误是因为你在方法中声明了一些静态的东西，这是没有意义的。只需删除static关键字。

第二个和第三个是因为您的方法没有返回类型 - 它必须是public void foo()，public String foo()或类似的东西。

基于Java，我无法找到我的代码中出错的地方

2 个答案: