在用戶指定的條件上使用while回圈-有解無憂

所以，下面是我的代碼：

public class StudentRun {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String[] names = new String[50];
        int[] rolls = new int[50];
        System.out.print("Do you want to register a student ?(yes/no): ");
        String res = sc.nextLine();
        while((res.toUpperCase()).equals("YES")) {
            System.out.print("Enter the student's name: ");
            String n = sc.nextLine();
            for(int i=1; i<50; i  ) {
                names[i] = n;
            }
            System.out.print("Enter their roll number: ");
            int r = sc.nextInt();
            for(int j=0; j<50; j  ) {
                rolls[j] = r;
            }
            
        }
        for(int a=0; a<50; a  ) {
            System.out.println(names[a]);
            System.out.println(rolls[a]);
        }
        
        
    
    }
    
}

我想要發生的是，該程式應該繼續注冊學生的姓名和卷號。直到陣列已滿或用戶結束它。我該怎么做？我走了那么遠

uj5u.com熱心網友回復：

您需要在回圈中有“繼續”問題，并且每次插入名稱時while都不需要回圈。for

public class StudentRun {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String[] names = new String[50];
        int[] rolls = new int[50];
        int index = 0;

        while(true) {
            System.out.print("Do you want to register a student ?(yes/no): ");
            String res = sc.nextLine();

            if(res.toUpperCase().equals("NO") || index == 50)
                break;

            System.out.print("Enter the student's name: ");
            String n = sc.nextLine();

            names[index] = n;

            System.out.print("Enter their roll number: ");
            int r = sc.nextInt();

            rolls[index] = r;

            index  ;
        }

        for(int i=0; i<50; i  ) {
            System.out.println(names[i]);
            System.out.println(rolls[i]);
        }
    }

}

uj5u.com熱心網友回復：

使用固定大小的陣列時，一種常見的方法是使用單獨的 int 變數來跟蹤新專案的當前索引位置，以及陣列中使用的總插槽數：

import java.util.*;
class Main {
  
  public static void main(String[] args)
  {
    Scanner sc = new Scanner(System.in);
    int size = 50;    
    String[] names = new String[size];
    int[] rolls = new int[size];
    
    int counter = 0;
    String res = "";
    do {
      System.out.print("Do you want to register a student ?(yes/no): ");
      res = sc.nextLine().toUpperCase();
      if (res.equals("YES")) {
        System.out.print("Enter the student's name: ");
        names[counter] = sc.nextLine();

        System.out.print("Enter their roll number: ");
        rolls[counter] = sc.nextInt();
        sc.nextLine(); // clear enter out of buffer;
        
        counter  ;
      }      
    } while (counter < size && res.equals("YES"));
  
    for(int a=0; a<counter; a  ) {
        System.out.print(names[a]   " : ");
        System.out.println(rolls[a]);
    }
  }
  
}

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