從Java中的數組獲取輸入變量

Question

我正試圖在這個數組中打印學生的名字。我不斷收到錯誤消息說，

[Ljava.lang.String; @ 55f96302

我聲明並初始化名稱上方附近，我試圖用「系統打印。 out.println（「學生的平均分數+名字+」是：「+ avg）;」但很明顯，單憑姓名並不是解決方案。我如何修復我的代碼？

import java.util.Scanner; 

public class Grades { 
    //An array to hold the student names 
    String[] Names = new String[6]; 

    //An array to hold students letter grades 
    char[] LetterGrades = new char[6]; 

    //an array to hold each of the students test scores 
    double[] Test1Scores = new double[6]; 
    double[] Test2Scores = new double[6]; 
    double[] Test3Scores = new double[6]; 

    void EnterData() { 
     //initialize the scanner to parse the user inputs 
     Scanner sc = new Scanner(System.in); 

     //initialize the for loop and create iterations from 0 to 6 
     for (int i = 0; i < 6; i++) { 
      //get user's name 
      System.out.print("Enter the name of student " + (i + 1) + ": "); 
      Names[i] = sc.next(); 

      //Create a while loop to get each of the students test scores 
      do { 
       System.out.print("Enter the score for Test 1: "); 
       Test1Scores[i] = sc.nextDouble(); 
      } while (Test1Scores[i] < 0 || Test1Scores[i] > 100); 
      do { 
       System.out.print("Enter the score for Test 2: "); 
       Test2Scores[i] = sc.nextDouble(); 
      } while (Test2Scores[i] < 0 || Test2Scores[i] > 100); 
      do { 
       System.out.print("Enter the score for Test 3: "); 
       Test3Scores[i] = sc.nextDouble(); 
      } while (Test3Scores[i] < 0 || Test3Scores[i] > 100); 
      System.out.println("Testscores: " + Test1Scores[i] + " " + Test2Scores[i] + " " + Test3Scores[i]); 
     } 
    } 

    void GetNames() { 
     for (int i = 0; i < 6; i++) 
      System.out.println((i + 1) + ". " + GetName(i + 1)); 
    } 

    String GetName(int studNumber) { 
     return (Names[studNumber - 1]); 
    } 
    //prints the 3 test scores of the student 
    void GetTestScores(int studNumber) { 
     System.out.println(GetTestScore(studNumber, 1) + " "); 
     System.out.println(GetTestScore(studNumber, 2) + " "); 
     System.out.println(GetTestScore(studNumber, 3) + " "); 
    } 

    double GetTestScore(int studNumber, int testNumber) { 
     if (testNumber == 1) 
      return (Test1Scores[studNumber - 1]); 
     else if (testNumber == 2) 
      return (Test2Scores[studNumber - 1]); 
     else if (testNumber == 3) 
      return (Test3Scores[studNumber - 1]); 
     return 0; 
    } 
    //calculate the average test score 
    double GetAverageScore(int studNumber) { 
     double avg = (Test1Scores[studNumber - 1] + Test2Scores[studNumber - 1] + Test3Scores[studNumber - 1])/3; 
     System.out.println("The average scores of student "+Names+" is:"+avg); 
     return avg; 
    } 

    void GetLetterGrades() { 
     for (int i = 1; i <= 6; i++) { 
      System.out.println("The letter grade of student " + (i) + " is: " + GetLetterGrade(i)); 
     } 
    } 

    char GetLetterGrade(int studNumber) { 
     double sum = Test1Scores[studNumber - 1] + Test2Scores[studNumber - 1] + Test3Scores[studNumber - 1]; 
     char letterGrade; 
     if (sum/3 >= 90) 
      letterGrade = 'A'; 
     else if (sum/3 >= 80) 
      letterGrade = 'B'; 
     else if (sum/3 >= 70) 
      letterGrade = 'C'; 
     else if (sum/3 >= 60) 
      letterGrade = 'D'; 
     else 
      letterGrade = 'F'; 
     return letterGrade; 
    } 

    void GetClassAverage() { 
     double sum = 0.0; 
     for (int i = 0; i < 6; i++) 
      for (int j = 0; j < 3; j++) 
       sum += GetTestScore(i + 1, j + 1); 
     System.out.println("The average of the class is: " + sum/18); 
    } 

    void GetTopGrade() { 
     char letterGrade; 
     double top = GetAverageScore(1); 
     for (int i = 2; i <= 6; i++) 
      if (GetAverageScore(i) > top) 
       top = GetAverageScore(i); 
     if (top >= 90) 
      letterGrade = 'A'; 
     else if (top >= 80) 
      letterGrade = 'B'; 
     else if (top >= 70) 
      letterGrade = 'C'; 
     else if (top >= 60) 
      letterGrade = 'D'; 
     else 
      letterGrade = 'F'; 
     System.out.println("The top score of the class is: " + letterGrade); 
    } 
} 

Answer 1

感謝您的幫助，但我能夠使它與如下：

System.out.println("The average scores of student " + Names[studentNumber - 1] + " is:"+avg); 

Answer 2

你想打印的是學生的名字，但是變量Names是它的數組類型。

那麼，你會想要做的是改變

System.out.println("The average scores of student "+Names+" is:"+avg); 

到

System.out.println("The average scores of student "+Names[studNumber]+" is:"+avg); 

這一點。

Answer 3

在您提供的示例中，您正在打印數組本身，而不是數組中的值。您需要迭代數組'Names'並逐個打印每個值。

for(int i = 0;i<Names.length;i++){ 
    System.out.println(Names[i]); 
} 

Answer 4

如果你要打印的學生的名字，如學生一個平均分數在字符串中，B，C爲：100

您可以創建返回逗號的方法分離的輸入字符串的值通過迭代元素並使用該方法： 「學生的平均分數+ csvStringMethod（Names）+」是：「+ avg