while while循環重複方法

Question

我似乎無法讓我的主要方法正常工作，因爲它應該100％。這很好，但我需要修復一個循環問題。

我的主要目標是在用戶輸入任何數字> = 1時讓程序重複方法pathCalc（），並在用戶輸入0時結束程序。但是，當用戶輸入> = 1重複該程序時，程序會重複，但當它詢問用戶是否重複或退出時，並且用戶輸入0退出時，程序會重複方法pathCalc（）而不是退出。

我如何得到這個方法重複工作後，讓用戶輸入> = 1重複的方法或0退出？

import java.util.Scanner; 

     public class AssignmentArrays{ 
     static int[] data = new int [6]; 

      public static void getIDs(){ 

       Scanner seg = new Scanner(System.in); 

       int[] data = new int [6]; 
       data[0] = 0; 
       data[1] = 0; 
       data[2] = 0; 
       data[3] = 0; 
       data[4] = 0; 
       data[5] = 0; 

       /* Segment values */ 



       System.out.println("Enter cost for segment 0:"); 
       data[0] = seg.nextInt(); 

       System.out.println("Enter cost for segment 1:"); 
       data[1] = seg.nextInt(); 

       System.out.println("Enter cost for segment 2::"); 
       data[2] = seg.nextInt(); 

       System.out.println("Enter cost for segment 3:"); 
       data[3] = seg.nextInt(); 

       System.out.println("Enter cost for segment 4:"); 
       data[4] = seg.nextInt(); 

       System.out.println("Enter cost for segment 5:"); 
       data[5] = seg.nextInt(); 

    } 

    public static void pathCalc(){  

    /* Path inputs */ 

    Scanner node1 = new Scanner(System.in); 


    int pathCost; 

    System.out.println("Enter ID of segment 0 of path:"); 
    int node1value = node1.nextInt(); 

    System.out.println("Enter ID of segment 1 of path:"); 
    int node2value = node1.nextInt(); 

    System.out.println("Enter ID of segment 2 of path:"); 
    int node3value = node1.nextInt(); 

    /* Path cost calculation */ 

    pathCost = data[node1value] + data[node2value] + data[node3value]; 
    System.out.println("The cost of the trip is: $" + pathCost); 
    } 

    public static void main(String[] args){ 
     getIDs(); 
     pathCalc(); 
     System.out.println("Enter 0 to exit or any other number"+ 
             " to evaluate another path:"); 
     int choice; 
     choice = end.nextInt(); 

     while(choice != 0){ 
     getIDs(); 
     pathCalc(); 
     System.out.println("Enter 0 to exit or any other number"+ 
             " to evaluate another path:"); 
     choice = end.nextInt(); 
     } 
    } 
} 

Answer 1

您正在閱讀while循環內的choice兩倍時間。如下移動一個例子：

getIDs(); 
    pathCalc(); 
    System.out.println("Enter 0 to exit or any other number"+ 
              " to evaluate another path:"); 
    int choice = end.nextInt(); 
    while(choice != 0){ 
     //getIDs(); 
     pathCalc(); 
     System.out.println("Enter 0 to exit or any other number"+ 
              " to evaluate another path:"); 
     choice = end.nextInt(); 
    } 

另外，不需要額外的標誌。您在上述條件下使用choice本身。

如果用戶在開始時輸入0，則無法啓動while循環;之後當用戶輸入0時，循環將自動終止。編號：已更新的程序。

public class AssignmentArrays { 
    static int[] data = new int[6]; 
    static Scanner seg; 

    public static void getIDs() { 
     int[] data = new int[6]; 
     data[0] = 0; 
     data[1] = 0; 
     data[2] = 0; 
     data[3] = 0; 
     data[4] = 0; 
     data[5] = 0; 

     /* Segment values */ 

     System.out.println("Enter cost for segment 0:"); 
     data[0] = seg.nextInt(); 

     System.out.println("Enter cost for segment 1:"); 
     data[1] = seg.nextInt(); 

     System.out.println("Enter cost for segment 2::"); 
     data[2] = seg.nextInt(); 

     System.out.println("Enter cost for segment 3:"); 
     data[3] = seg.nextInt(); 

     System.out.println("Enter cost for segment 4:"); 
     data[4] = seg.nextInt(); 

     System.out.println("Enter cost for segment 5:"); 
     data[5] = seg.nextInt(); 

    } 

    public static void pathCalc() { 
     int pathCost; 

     System.out.println("Enter ID of segment 0 of path:"); 
     int node1value = seg.nextInt(); 

     System.out.println("Enter ID of segment 1 of path:"); 
     int node2value = seg.nextInt(); 

     System.out.println("Enter ID of segment 2 of path:"); 
     int node3value = seg.nextInt(); 

     /* Path cost calculation */ 

     pathCost = data[node1value] + data[node2value] + data[node3value]; 
     System.out.println("The cost of the trip is: $" + pathCost); 
    } 

    public static void main(String[] args) { 
     seg = new Scanner(System.in); 
     getIDs(); 
     pathCalc(); 
     System.out.println("Enter 0 to exit or any other number" 
       + " to evaluate another path:"); 
     int choice; 
     choice = seg.nextInt(); 

     while (choice != 0) { 
      getIDs(); 
      pathCalc(); 
      System.out.println("Enter 0 to exit or any other number" 
        + " to evaluate another path:"); 
      choice = seg.nextInt(); 
     } 
     seg.close(); 
    } 
} 

Answer 2

if (choice == 0){ 
System.exit(0); 
} 

直接退出或確保進入循環