Question

我需要接受用户输入并将它们发布到二维数组。这就是我到目前为止所做的：

System.out.print("How many students? ");
    Scanner scan = new Scanner(System.in);
    int input = scan.nextInt();
    int col = input;
    int row = 5;
    String[][] y = new String[col][row];
    for (col = 0; col < y.length; col++) {
        for(row = 0; row < y[col].length; row++){
        int n = col + 1;
        System.out.println("Enter the name and grades of student " + n);
        y[col][row] = scan.next();
    }System.out.println();
    }
    for(row = 0; row< y.length; row++){
           for(col = 0 ;col< y[row].length; col++){ 
                 System.out.println(y[row][col]);
           } 
          System.out.println(); 
       }

唯一的问题是，在转到下一个学生之前，它会向同一个问题提出5次问题。我会坚持这条路吗？或者更容易废弃它并采用不同的方法去做它？

Answer 1

您可以做的是，您可以询问特定学生的所有详细信息，然后继续为下一个学生而不是为每个学生提出相同的问题。

Answer 2

试试这个：

System.out.print("How many students? ");
Scanner scan = new Scanner(System.in);
int input = scan.nextInt();
int col = input;
int row = 5;
String[][] y = new String[col][row];
for (col = 0; col < y.length; col++) {
    System.out.println("Enter the name and grades of student " + col);
    for(row = 0; row < y[col].length; row++){
    int n = col + 1;
    y[col][row] = scan.next();
}System.out.println();
}
for(row = 0; row< y.length; row++){
       for(col = 0 ;col< y[row].length; col++){ 
             System.out.println(y[row][col]);
       } 
      System.out.println(); 
   }

这将要求每个学生输入一次详细信息。

Answer 3

如果你想接受姓名和4年级的输入，那么这就是你的代码，否则详述你的问题

for (col = 0; col < y.length; col++) {
> 
>         int n = col + 1;
>     
>       System.out.println("Enter the name and grades of student " + n);
>     
>         for(row = 0; row < y[col].length; row++){
>           
>         y[col][row] = scan.next();
>     }System.out.println();
>     }

Answer 4

你的这个循环通过每个学生，

for (col = 0; col < y.length; col++)

你的这个循环通过每个音符并要求输入它们，

for(row = 0; row < y[col].length; row++)

因此，您有理由要求用户仅一次输入该笔记，说您每次迭代学生时只需要问在数组中，只需更改：

for (col = 0; col < y.length; col++) {
    for(row = 0; row < y[col].length; row++){
        int n = col + 1;
        System.out.println("Enter the name and grades of student " + n); //you are asking each time you iterate a note
        y[col][row] = scan.next();
    }System.out.println();

到此：

for (col = 0; col < y.length; col++) {
    System.out.println("Enter the name and grades of student " + col); //you are asking each time you iterate a student
    for(row = 0; row < y[col].length; row++){
        int n = col + 1;
        y[col][row] = scan.next();
    }System.out.println();
   }

无法获取用户输入和形成数组

4 个答案: