不确定在Java代码中使用什么标识符[已关闭]

Question

编辑：我确实更改了代码，但在这样做的时候，我创建了更多的问题，我不知道如何修复一些问题。

public class StudentAverage

{//计算学生总数的方法public static int addToCounter（int numberOfStudents）{

  ++numberOfStudents;
  
  return numberOfStudents;

}

//计算test one得分公共静态float addToTestOneScoresAccumulator（float testOneScore）{float TotalTestonesCores；

  totalTestOneScores += testOneScore;
  
  return totalTestOneScores;

}

  totalTestTwoScores += testTwoScore;
  
  return totalTestTwoScores;

  totalOverallTestScores = totalTestOneScores + totalTestTwoScores;
  
  return totalOverallTestScores;

  if (testOneScore < lowestTestOneScore)
     lowestTestOneScore = testOneScore;
  
  return lowestTestOneScore;

//计算测试一的最高分的方法public static float findHighestTestOneScore（float testOneScore）{float highesttestonescore；

  if (testOneScore > highestTestOneScore)
     highestTestOneScore = testOneScore;
                    
  return highestTestOneScore;

}

//计算测试两个分数的最低分的方法公共静态float findLowestTestTwoScore（float testTwoScore）{float loWestTestTwosCore；

  if (testTwoScore < lowestTestTwoScore)
     lowestTestTwoScore = testTwoScore;
                    
  return lowestTestTwoScore;

  if (testTwoScore > highestTestTwoScore)
     highestTestTwoScore = testTwoScore;
                    
  return highestTestTwoScore;

  if (numberOfStudents > 0)
  {
     averageScore = totalOverallTestScores/numberOfStudents;
  }
  else
  {
     averageScore = 00.00f;
  }
  
  return averageScore;

}

}//下课

import java.util.Scanner;
import java.text.DecimalFormat;
import javax.swing.JOptionPane;

public class StudentAverageCalculationsTest
{
   public static void main(String[] args)
   {
      //Define the programmer-defined variables
      int optionSelected;
      
      int processRecords;
      
      int numberOfStudents = 0;
      
      int      studentNumber;
      String   studentName;
      
      float testOneScore;
      float testTwoScore;
      
      float totalTestOneScores;
      float totalTestTwoScores;
      float totalOverallTestScores;
      
      float lowestTestOneScore   = 00.00f;
      float highestTestOneScore    = 00.00f;
      float lowestTestTwoScore   = 00.00f;
      float highestTestTwoScore    = 00.00f;
      
      float averageScore;
            
      // Scanner object for keyboard input
      Scanner keyboardInput = new Scanner(System.in);
      
      System.out.print("Would you like to run the program\n" +
                          " Type 1 for Yes or -1 for No ");
        processRecords = keyboardInput.nextInt();
        keyboardInput.nextLine();
        
        while (processRecords != -1)
        {
           studentNumber     = getStudentNumber();
           
           studentName       = getStudentName();
           
           testOneScore      = getTestOneScore();
           
           testTwoScore      = getTestTwoScore();
                                   
           numberOfStudents = StudentAverage.addToCounter(numberOfStudents);
           
           totalTestOneScores   = StudentAverage.addToTestOneScoresAccumulator(testOneScore,
                                                                               totalTestOneScores);
                                                        
           totalTestTwoScores   = StudentAverage.addToTestTwoScoresAccumulator(testTwoScore,
                                                                               totalTestTwoScores);
                                                     
           totalOverallTestScores   = StudentAverage.addToOverallTestScoresAccumulator(totalTestOneScores,
                                                                                      totalTestTwoScores,
                                                                                      totalOverallTestScores);
        }
        
     }
     
   public static int getStudentNumber()
     {
        int studentNumber;
        
        Scanner keyboardInput = new Scanner(System.in);
        
        System.out.print("Enter the Student Number ");
        studentNumber = keyboardInput.nextInt();
        
        while ( studentNumber < 0 || studentNumber > 100000 )
        {
           JOptionPane.showMessageDialog(null,
           "The student number entered is not in an acceptable range.",
           "Invalid Entry", JOptionPane.WARNING_MESSAGE);
           
           studentNumber = JOptionPane.showInputDialog(null,
           "Please re-enter a value from 0 to 100000 only ", "Error",
           JOptionPane.ERROR_MESSAGE);
           studentNumber   = Integer.parseInt();
        }
        
        return studentNumber;
     }
     
     public static String getStudentName()
     {
        String studentName;
       
       Scanner keyboardInput = new Scanner(System.in);
       
       System.out.print("Enter the Student Name ");
       studentName    = keyboardInput.nextLine();
       
       while ( studentName.isEmpty() )
       {
          JOptionPane.showMessageDialog(null,
          "The student name cannot be empty.", "Invalid Entry",
          JOptionPane.WARNING_MESSAGE);
          
          studentName  = JOptionPane.showInputDialog(null,
          "Please re-enter a name for the student ", "Error",
          JOptionPane.ERROR_MESSAGE);
       }
       
       return studentName;
    }
 
    public static Float getTestOneScore()
    {
       float testOneScore;
       
       Scanner keyboardInput = new Scanner(System.in);
       
       System.out.print("Enter Test One's Score ");
       testOneScore    = keyboardInput.nextFloat();
       
      while ( testOneScore < 0 || testOneScore > 100 )
       {
          JOptionPane.showMessageDialog(null,
          "The test score entered is not in an acceptable range.",
          "Invalid Entry", JOptionPane.WARNING_MESSAGE);
          
          testOneScore = JOptionPane.showInputDialog(null,
          "Please re-enter a value from 0 to 100 only ", "Error",
          JOptionPane.ERROR_MESSAGE);
          testOneScore   = Integer.parseInt();
       }
       
       return testOneScore;
    }
    
    public static Float getTestTwoScore()
    {
       float testTwoScore;
       
       Scanner keyboardInput = new Scanner(System.in);
       
       System.out.print("Enter Test Two's Score ");
       testTwoScore    = keyboardInput.nextFloat();
       
       while ( testTwoScore < 0 || testTwoScore > 100 )
       {
          JOptionPane.showMessageDialog(null,
          "The test score entered is not in an acceptable range.",
          "Invalid Entry", JOptionPane.WARNING_MESSAGE);
          
          testTwoScore = JOptionPane.showInputDialog(null,
          "Please re-enter a value from 0 to 100 only ", "Error",
          JOptionPane.ERROR_MESSAGE);
          testTwoScore   = Integer.parseInt();
       }
       
       return testTwoScore;
    }
    
    public static void chooseOption()
    {
    
    // Scanner object for keyboard input
      Scanner keyboardInput = new Scanner(System.in);
      
    // Prompt the computer user to select an option
      System.out.println("\nType an option to perform the operation\n" +
          "   Option 1:  Find the Lowest Test One Score\n" +
          "   Option 2:  Find the highest Test One Score\n" +
          "   Option 3:  Find the lowest Test Two Score\n" + 
          "   Option 4:  Find the highest Test Two Score\n" + 
          "   Option 5:  Calculate the Overall Class Average Test Score\n" + 
          "   Option 6: End the Program\n");
          
      optionSelected = keyboardInput.nextInt();
      keyboardInput.nextLine();   //Consume enter key
      
      while (optionSelected != 6)
      {
         switch(optionSelected)
         {
            // Find the lowest Test One Score
            case 1:
               lowestTestOneScore  = StudentAverage.findLowestTestOneScore
                           (testOneScore);
               System.out.printf("\nThe lowest test one score is %.2f%n", lowestTestOneScore);
               break;
               
            // Find the highest Test One Score
            case 2:
               highestTestOneScore  = StudentAverage.findHighestTestOneScore
                           (testOneScore);
               System.out.printf("\nThe highest test one score is %.2f%n", highestTestOneScore);
               break;
            
            // Find the lowest Test Two Score
            case 3:
               lowestTestTwoScore  = StudentAverage.findLowestTestTwoScore
                           (testTwoScore);
               System.out.printf("\nThe lowest test two score is %.2f%n", lowestTestTwoScore);
               break;
               
            // Find the highest Test Two Score
            case 4:
               highestTestTwoScore  = StudentAverage.findHighestTestTwoScore
                           (testTwoScore);
               System.out.printf("\nThe highest test two score is %.2f%n", highestTestTwoScore);
               break;
               
            // Calculate the average of test scores
            case 5:
               averageScore = StudentAverage.calculateAverage
                               (totalOverallTestScores,
                                numberOfStudents);
               System.out.printf("\nThe Overall Class Average of The Tests Are      " +
                                 (formatOutput.format(averageAnswer)));
               break;
                
            // End of the program run
            case 6:
               break;
               
           // Validation check
           default:
            System.out.println("Enter a number from 1 to 6 only ");
         } // End of the switch statement
         
         // Prompt the computer user to select an option
         System.out.println("\nType an option to perform the operation\n" +
             "   Option 1:  Find the Lowest Test One Score\n" +
             "   Option 2:  Find the highest Test One Score\n" +
             "   Option 3:  Find the lowest Test Two Score\n" + 
             "   Option 4:  Find the highest Test Two Score\n" + 
             "   Option 5:  Calculate the Overall Class Average Test Score\n" + 
             "   Option 6: End the Program\n");
             
         optionSelected = keyboardInput.nextInt();
         keyboardInput.nextLine();  //Consume enter key
         
      } // End of the while statement
         
   } // End of the mainmethod
   
} // End of the class

Answer 1

这是无效的：

public static void()

那应该是你的主要方法吗？在这种情况下，您将需要：

public static void main(String[] args)

它称为方法签名。如果您需要编写其他方法，您必须问自己是否需要public,private,default,protected。然后你决定是否是静电。然后选择一个返回值或void，然后根据方法要做的事情来命名它。例如，将两个整数相加的方法是

public int add(int a, int b){}