Java程序正在请求main方法，但它赢了'；不行？

您好，我正在为我的一个项目测试此代码：

import java.util.*;

public class Multiply

{
   Random randomNumbers = new Random();

   int answer; // the correct answer

   // ask the user to answer multiplication problems
   public void quiz()
   {
      Scanner input = new Scanner( System.in );

      int guess; // the user's guess

      createQuestion(); // display the first question

      System.out.println( "Enter your answer (-1 to exit):" );
      guess = input.nextInt();

      while ( guess != -1 )
      {
         checkResponse( guess );

         System.out.println( "Enter your answer (-1 to exit):" );
         guess = input.nextInt();
      } // end while
   } // end method

   // prints a new question and stores the corresponding answer
   public void createQuestion()
   {
      // get two random numbers between 0 and 9
      int digit1 = randomNumbers.nextInt( 10 );
      int digit2 = randomNumbers.nextInt( 10 );

      answer = digit1 * digit2;
      System.out.printf( "How much is %d times %d?\n",
         digit1, digit2 );
   } // end method createQuestion

   // checks if the user answered correctly
   public void checkResponse( int guess )
   {
      if ( guess != answer )
         System.out.println( "No. Please try again." );
      else
      {
         System.out.println( "Very Good!" );
         createQuestion();
      } // end else      
   } // end method checkResponse   
} // end class Multiply
/**/

当我尝试运行它时，它会要求使用main方法“publicstaticvoidmain（String[]args）”，但当我在开始时添加它时，会出现大量错误。谁能告诉我哪里出了问题

这就是我添加main方法的时候：

import java.util.*;

public class Multiply
{
   public static void main(String[] args)     
{
   Random randomNumbers = new Random();

   int answer; // the correct answer

   // ask the user to answer multiplication problems
   public void quiz()
   {
      Scanner input = new Scanner( System.in );

      int guess; // the user's guess

      createQuestion(); // display the first question

      System.out.println( "Enter your answer (-1 to exit):" );
      guess = input.nextInt();

      while ( guess != -1 )
      {
         checkResponse( guess );

         System.out.println( "Enter your answer (-1 to exit):" );
         guess = input.nextInt();
      } // end while
   } // end method

   // prints a new question and stores the corresponding answer
   public void createQuestion()
   {
      // get two random numbers between 0 and 9
      int digit1 = randomNumbers.nextInt( 10 );
      int digit2 = randomNumbers.nextInt( 10 );

      answer = digit1 * digit2;
      System.out.printf( "How much is %d times %d?\n",
         digit1, digit2 );
   } // end method createQuestion

   // checks if the user answered correctly
   public void checkResponse( int guess )
   {
      if ( guess != answer )
         System.out.println( "No. Please try again." );
      else
      {
         System.out.println( "Very Good!" );
         createQuestion();
      } // end else      
   } // end method checkResponse   
} // end class Multiply
/**/

添加以下内容时出现的错误：

Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - illegal start of expression
    at multiply.Multiply.main(Multiply.java:23)

---

看起来您正在主方法内部创建函数，这可能会导致一些问题。尝试将main方法与类的其余部分分开。例如：

public static void main(String[] args)
{
   quiz();
}

-Rest of code here

---

您在main方法中定义方法，添加main方法时，您的想法是有一个“main”方法来调用程序的其余部分。 不要将所有内容都放在主菜单中，而是尝试添加

 public static void main(String[] args){
// call some function here or whatnot
}

---

请在代码中包含您试图包含的

main

方法。您所说的“当我在开头添加它时”是什么意思？您在哪里添加了

publicstaticvoidmain（String[]args）

？我在类声明之后添加它。什么类型的错误？