错误：此方法必须返回int类型的结果 [英] ERROR: This method must return a result of type int

问题描述

代码：

import java.util.*;

public class shuffleDeck
{ 
    public static int shuffleDeck (int[] deck, int theNumber)
    {
        int [] array1 = new int [52];

        Random random = new Random();
        for (int i = deck.length, j, tmp; i > 1; i--) {
            j = random.nextInt(i);

            tmp = deck[i - 1];
            deck[i - 1] = deck[j];
            deck[j] = tmp;
            return theNumber;
        }
    }

    public static void main(String[] args)
    {
        int [] deck = new int [52];
        for(int i=0; i<52; i++)
        {
            deck[i]=i+1;
        }
        int count;
        count=1;
        int total=1;
        shuffleDeck(deck, count);
        System.out.println();
    }
}

方法shuffleDeck出错。我不确定这意味着什么我需要返回一些东西，但它不会返回，我得到这个奇怪的错误。

There is an error on the method shuffleDeck. I am not sure what it means I need to return something but it wont return and I am getting this odd error.

我一直无法解决这个问题我看了遍布各地。
感谢任何能帮我修复此错误的人。

I have not been able to solve this I have looked around all over stack. Thank you to whoever can help me fix this error.

推荐答案

在java上，当你定义一个方法时，那个方法必须要么必须返回一个值，要么必须用void关键字声明。

On java, when you define a method, that method must either must return a value, or must be declared with the void keyword.

public static int shuffleDeck(int[] deck);

表示您将返回一个原始整数（ int ）使用 返回 关键字。

means, you are going to return a primitive integer (int) with the use of return keyword.

public static int shuffleDeck(int[] deck);

表示您不会返回某些内容，因此 void 来声明。

means, you are not going to return something, thus void is used here to declare that.

最后，我认为这是你试图完成的，你提供的代码有几个问题，你可以查看下面的示例;

Finally, I think this is what you try to accomplish, there were some several problems on the code you have provided, may be you can go over the sample below;

import java.util.Random;

public class Test1 {

    public static void shuffleDeck(int[] deck) {
        int[] array1 = new int[52];

        Random random = new Random();
        for (int i = deck.length, j, tmp; i > 1; i--) {
            j = random.nextInt(i);

            tmp = deck[i - 1];
            deck[i - 1] = deck[j];
            deck[j] = tmp;
        }
    }

    public static void main(String[] args) {
        int[] deck = new int[52];
        for (int i = 0; i < deck.length; i++) {
            deck[i] = i + 1;
        }

        System.out.println("Initial Ordered Deck");
        printDeck(deck);

        int count;
        count = 1;
        int total = 1;

        shuffleDeck(deck);

        System.out.println("Shuffled Deck");
        printDeck(deck);

    }

    private static void printDeck(int[] deck) {
        System.out.println("**************************************");

        for (int i = 0; i < deck.length; i++) {
            if (i % 13 == 0 && i > 0 )
                System.out.println();

            System.out.printf("%2d ", deck[i]);
        }

        System.out.println("\n**************************************");
        System.out.println();
    }

}

输出为;

Initial Ordered Deck
**************************************
 1  2  3  4  5  6  7  8  9 10 11 12 13 
14 15 16 17 18 19 20 21 22 23 24 25 26 
27 28 29 30 31 32 33 34 35 36 37 38 39 
40 41 42 43 44 45 46 47 48 49 50 51 52 
**************************************

Shuffled Deck
**************************************
22  6 13 11 35 23 29 27  8 30 44 20  1 
31 34 28 47  5 46 17 51 38  3 19 36 18 
42 33  7  4  2 24 41  9 15 45 21 16 37 
14 48 43 49 32 12 40 39 26 50 52 10 25 
**************************************

这篇关于错误：此方法必须返回int类型的结果的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！