计算5个考试成绩的平均值

Question

我有代码要求用户输入5个测试分数，然后计算5个测试分数的平均值。代码编译并运行得很好，但我的问题是：我的代码输出的对话框多于必要的。我想尝试找到一种方法来一次显示输出或使用较少的对话框。我是Java的新手，所以我还在学习。如果您运行代码，您将更好地了解我想要获得的内容。

更新：有没有人知道为什么0.0级会出现在我的结果窗口中？什么是摆脱它的最好方法？

import javax.swing.JOptionPane; //Needed for GUI

import java.text.DecimalFormat; //needed to format the Output





public class DTTestAverageAndGrade

{//Begin class

public static void main(String[] args)

{//Begin main method



    String inputString;   //For reader's input

    double Score1,       //Define score1

           Score2,      //Define  score2

           Score3,     //Define   score3

           Score4,    //Define    score4
           Score5,   //Define     score5
           Average ;//Define      Average



DecimalFormat formatter = new DecimalFormat("#,##0.0"); //format the scores



    // Get the five scores

    inputString=

      JOptionPane.showInputDialog("Enter the First Test Score: "); //ask user to enter the first test score

    Score1 = Double.parseDouble(inputString);



    inputString=

      JOptionPane.showInputDialog("Enter the Second Test Score: ");//ask user to enter the second test score

    Score2 = Double.parseDouble(inputString);



    inputString=

      JOptionPane.showInputDialog("Enter the third test score: ");//ask user to enter the third test score

    Score3 = Double.parseDouble(inputString);



    inputString=

      JOptionPane.showInputDialog("Enter the fourth test score: ");//ask user to enter the fourth test score

    Score4 = Double.parseDouble(inputString);



    inputString=

      JOptionPane.showInputDialog("Enter the fifth test score: ");//ask user to enter the fifth test score

    Score5 = Double.parseDouble(inputString);



    // Call to method calcAverage and output the 5 test average

      Average = calcAverage(Score1, Score2, Score3, Score4, Score5);







    // Display Average test Score and Determine the letter grade for each test and call to determineGrade



            JOptionPane.showMessageDialog(null, "\t\nYour Score 1  is : " +formatter.format(Score1)  +"\t Grade: " + determineGrade(Score1)

                                              + "\t\nYour Score 2  is : " +formatter.format(Score2)  +"\t Grade: " + determineGrade(Score2)

                                              + "\t\nYour Score 3  is : " +formatter.format(Score3)  +"\t Grade: " + determineGrade(Score3)

                                              + "\t\nYour Score 4  is : " +formatter.format(Score4)  +"\t Grade: " + determineGrade(Score4)

                                              + "\t\nYour Score 5  is : " +formatter.format(Score5)  +"\t Grade: " + determineGrade(Score5)

                                           + "\t\nYour Average  is : " +formatter.format(Average) +"\t Grade: " + determineGrade(Average),

                                                "\tYour Test Results",JOptionPane.INFORMATION_MESSAGE);



    }//end Main method



    // Calculate the average of the five test scores

    public static double calcAverage(double Score1, double Score2, double Score3, double Score4, double Score5)

    {

        double Average = ((Score1 + Score2 + Score3 + Score4 + Score5) / 5);

        return Average;

    }



    // Determine the letter grade for the average and 5 test scores

   public static double determineGrade(double Average)

    {

        char grade; // Define grade



        // Determine letter grade

     if (Average>=90)

        {

            grade = 'A';

            JOptionPane.showMessageDialog(null, grade + "\n");

     }

        else if (Average>=80)

        {

            grade = 'B';

            JOptionPane.showMessageDialog(null, grade + "\n");

        }

        else if (Average>=70)

        {

            grade = 'C';

           JOptionPane.showMessageDialog(null, grade + "\n");

        }

        else if (Average>=60)

        {

            grade = 'D';

            JOptionPane.showMessageDialog(null, grade + "\n");

        }

        else if (Average<60)

        {

            grade = 'F';

            JOptionPane.showMessageDialog(null, grade + "\n");

      }

        else

        {

            JOptionPane.showMessageDialog(null, "error\n");

        }



        return 0;



    }//end determinegrade method

}//end class

Answer 1

您可以输入一个字符串并拆分。 例如：

String inputString=
      JOptionPane.showInputDialog("Enter 5 test Scores with comma: "); //ask user to enter the 5 test scores at once

 String[] scores = inputString.split(",");
score1 = scores[0];
score2 = scores[1];
score3 = scores[2];
score4 = scores[3];
score5 = scores[4];

Answer 2

您几乎可以在Object showInputDialog参数中添加任何内容。很可能你会想要添加一个面板，其中包含你需要的任何位，例如：

  JTextField score1 = new JTextField(10);
  JTextField score2 = new JTextField(10);
  JTextField score3 = new JTextField(10);
  JTextField score4 = new JTextField(10);
  JTextField score5 = new JTextField(10);

  JPanel scorePanel = new JPanel();
  scorePanel.add(new JLabel("First Test Score:"));
  scorePanel.add(score1);
  scorePanel.add(Box.createHorizontalStrut(15)); // a spacer
  scorePanel.add(new JLabel("Second Test Score:"));
  scorePanel.add(score2);
  scorePanel.add(Box.createHorizontalStrut(15));
  scorePanel.add(new JLabel("Third Test Score:"));
  scorePanel.add(score3);
  scorePanel.add(Box.createHorizontalStrut(15));
  scorePanel.add(new JLabel("Fourth Test Score:"));
  scorePanel.add(score4);
  scorePanel.add(Box.createHorizontalStrut(15));
  scorePanel.add(new JLabel("Fifth Test Score:"));
  scorePanel.add(score5);

  int result = JOptionPane.showInputDialog(null, scorePanel, 
           "Please enter all 5 test scores.");

  double Score1 = Double.parseDouble(score1.getText());
  double Score2 = Double.parseDouble(score2.getText());
  ... etc.

然后像你一样计算和显示结果。