您可以在同一個類中使用.nextInt（）來處理Java.util.Random和Java.util.Scanner嗎？

Question

我剛開始使用java，所以這可能會非常簡單，但我們班有4人無法弄清楚這段代碼有什麼問題。我擔心這可能是掃描器和隨機命令之間的重疊問題，因爲.nextInt（）是用於獲取新輸入並創建0到n之間的隨機變量的命令。此外，我相當新的Stackoverflow，所以如果有任何程序即時打破，我應該嘗試在未來適應，ID很樂意採取你的建議。

感謝您提前幫助...乾杯

import java.util.Scanner; 
import java.util.Random; 

public class Question4 { 
public static void main(String arg[]){ 
    //----------------------------- 

    int numdice; 
    int sides; 
    int count = 1; 
    int score; 
    int total = 0; 
    boolean loop = false; 
    Scanner scan = new Scanner(System.in); 
    Random random = new Random(); 


    System.out.print("Enter how many dice you would like to roll:"); 
    numdice = scan.nextInt(); 

    System.out.println("Enter how many sides to the dice there will be:"); 
    sides = scan.nextInt(); 

    System.out.println("You have rolled " + numdice + " dice with " + sides + " sides and have received the following values for each roll:"); 

    while (!loop) { 
     if (numdice <= count){ 
      score = random.nextInt(sides -1) +1; 
      total += score; 
      System.out.print(score); 
      ++count; 
     } 
     else 
     { 
      System.out.println(); 
      System.out.print(" your total value for your dices rolls are " + total); 
      loop = true; 
     } 
    } 
    System.out.println(); 


    //----------------------------- 
} 

} 

編輯：症狀是程序運行，但不創建/打印爲隨機變量的任意值。該程序將打印else語句，但它聲稱總值= 0.根據Eclipse，程序中沒有錯誤或錯誤。也感謝你關於空間的注意事項。

你們是對的，照顧它。多麼愚蠢。塗料。謝謝seth和paku！我會評價你，但它不會讓我。不管有沒有美好的一天！

Answer 1

你的if語句是倒退的。 if (count <= numdice)

import java.util.Scanner; 
import java.util.Random; 

public class Question4 { 
public static void main(String arg[]){ 
    //----------------------------- 

    int numdice; 
    int sides; 
    int count = 1; 
    int score; 
    int total = 0; 
    boolean loop = false; 
    Scanner scan = new Scanner(System.in); 
    Random random = new Random(); 


    System.out.print("Enter how many dice you would like to roll:"); 
    numdice = scan.nextInt(); 

    System.out.println("Enter how many sides to the dice there will be:"); 
    sides = scan.nextInt(); 

    System.out.println("You have rolled " + numdice + " dice with " + sides + " sides and have received the following values for each roll:"); 

    while (!loop) { 
     if (count <= numdice){ 
      score = random.nextInt(sides -1) +1; 
      total += score; 
      System.out.print(score + " "); //Also, easier to read with a space. 
      ++count; 
     } 
     else 
     { 
      System.out.println("Your total value for your dices rolls are " + total); 
      loop = true; 
     } 
    } 
    System.out.println(); 


    //----------------------------- 
} 

} 

Answer 2

你不應該使用nextInt()從掃描儀和隨機對象都存在問題。這些方法屬於兩個完全不同的類。

我認爲你的while循環中的if語句有點向後。你想擲骰子numdice的次數，對嗎？因爲現在你正在測試numdice是否小於你的卷數。這是你想要的嗎？

if (count <= numdice){ 

Answer 3

改變，如果（numdice < =計數），以IF（numdice> = COUNT），你將得到答案......