Question

我试图将这些数据作为一个表输出，但我还没能用我尝试过的任何方法制作一个功能性的二维数组表。我试图为gradeList和devList创建一个7x2矩阵。

我将预先初始化和用户输入数据分成3个数组。我试图用其中两个制作一张桌子（然后用另一张作为标签）。 nameList将是行的标签，并且＆＃39; grade＆＃39;和＆＃39;偏离＆＃39;将是列的标签（我还没有试图设置它）。

我已经注释掉了第一次尝试，它输出了正确的信息，但无法制作可读的表格。程序编译，但是当我使用矩阵的当前尝试运行它时会抛出错误。

很抱歉，如果我忘记了任何有用的信息，感谢您的光临。

    //This program determines the mean grade and deviation from that mean for a class of users.

    import java.util.Scanner;

public class gradeArrays
{    
   static Scanner in = new Scanner(System.in);
   static int avg;

   //array declarations
   static String[] nameList = {"Doc","Grumpy","Happy","Sleepy","Dopey","Sneezy","Bashful"};
   static int[] gradeList = new int[7];
   static int[] devList = new int[7];

   //main method
   public static void main(String[] args)
   {
      System.out.println("This program will calculate the mean, and the deviation from that mean, for 7 students.");

      getGrades(gradeList);

      meanCalc(gradeList);      

      devCalc(gradeList, avg);

      tableOut(gradeList, devList, avg);
   }

   //input scores from user, method 1
   public static int[] getGrades(int[] gradeList)
   {

      for (int i=0; i < nameList.length; i++)
      {
         System.out.println("What is the grade for " + nameList[i] + "?");
         gradeList[i]= in.nextInt();
      }

      return gradeList;
   }


   //calculate average, method 2
   public static int meanCalc(int[] gradeList)
   {
      int sum = 0;   

      for (int i = 0; i < nameList.length; i++)
      {
         sum = sum + gradeList[i];
      }

         if (gradeList.length !=0)
         {   
            avg = sum / gradeList.length;
         }

         else
         {
            avg = 0;
         }

      return avg;
   }

   //calculate deviation, method 3
   public static int[] devCalc(int[] gradeList, int avg)
   {  
      for (int i = 0; i < nameList.length; i++)   
      {
         devList[i] = gradeList[i] - avg;
      }

      return devList;

   }


   //output, method 4
   public static void tableOut(int[] gradeList, int[] devList, int avg)
   {  
      /*
      System.out.println("   Student  Grade  Deviation");

      for (int i = 0; i < nameList.length; i++)
      {   
         System.out.print("   " + nameList[i] +  "   ");
         System.out.print("   " + gradeList[i] + "   ");
         System.out.printf("   " + "%7d", devList[i]); 
         System.out.println();
      }
      System.out.println("The average grade was " + avg + ".");
      */

      int[][] outTable = new int[7][2];

      for (int row = 0; row < nameList.length; row++)
      {
         for (int col = 0; col < 3; col++)
         {
            outTable[row][col] = 21;
         }
      }
   }
}

Answer 1

public static void tableOut(int[] gradeList, int[] devList, int avg)
        {  

           System.out.println("\tStudent\tGrade\tDeviation");

           for (int i = 0; i < nameList.length; i++)
           {   
              System.out.print("\t" + nameList[i] +  "\t");
              System.out.print("\t" + gradeList[i] + "\t");
              System.out.printf("\t" + "%7d", devList[i]); 
              System.out.println();
           }
           System.out.println("The average grade was " + avg + ".");


           int[][] outTable = new int[7][2];

           for (int row = 0; row < nameList.length; row++)
           {
              for (int col = 0; col <2; col++)
              {
                 outTable[row][col] = 21;

              }
           }
        }

此代码正常运行...试试这个。

java中2d数组的输出表

1 个答案: