线程“main”java.lang.arrayindexoutofboundsexception中出现异常：4错误

uxhixvfz 于 2021-07-09 发布在 Java

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我在做一个项目，我想给一个数组分配5个随机数，然后按升序排序，但我得到以下错误。。。。如果有任何帮助，我将不胜感激。

import java.util.Scanner;

public class YahtzeeGame {
public static Scanner sc = new Scanner(System.in);
    // random = random  between 1.0 and (6 * .999) + 1 is forced to be   integer      1-6
public static int random = (int) (Math.random() * 6 + 1);
public static int[] dice = new int[4];
public static void main (String[] args) {
    System.out.println("welcome to Yahtzee!");
    roll(dice);

}public static void roll (int[] dice) {
    for (int i = 0; i < dice.length; i++) {
        dice[i] = random;
        sort(dice);
    }
} public static void sort(int[] dice) {
    int temp;
    for (int j = 0; j < dice.length - 1; j++) {
        for (int i = 1; i < dice.length - j; i++) {
            if( dice[i] > dice[i+1]) {
                temp = dice[i-1];
                dice[i-1] = dice[i];
                dice[i] = temp;
            }
        }
    }  
}
}

Java

来源：https://stackoverflow.com/questions/41455732/exception-in-thread-main-java-lang-arrayindexoutofboundsexception-4-error

2条答案

按热度按时间

31moq8wy1#

什么时候 j = 0 ，循环 for (int i = 1; i < dice.length - j; i++) 运行到 dice.length - 1 . 所以，你正在访问 dice[dice.length] 在 if( dice[i] > dice[i+1]) 这就抛出了一个例外。

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xzv2uavs2#

我已经修改了你的代码希望这有帮助！我使用arraylist来存储骰子值，并使arraylist对其进行相应的排序。

package activities;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Random;
import java.util.Scanner;

public class YahtzeeGame {   

    public static Scanner sc = new Scanner(System.in);
        // random = random  between 1.0 and (6 * .999) + 1 is forced to be   integer      1-6
    public static Random rndm = new Random();
    public static int[] dice = new int[5];
    public static ArrayList<Integer> diceNumber = new ArrayList<>(5);

    public static void roll () {
        for (int i = 0; i < dice.length; i++) {
            dice[i] = rndm.nextInt(6) + 1;           
            while(diceNumber.contains(dice[i])){
                dice[i] = rndm.nextInt(6) + 1;
            }
            diceNumber.add(dice[i]);
        }       
        Collections.sort(diceNumber);
        System.out.println("" + diceNumber);
    } 

    public static void main(String[] args) {
        System.out.println("welcome to Yahtzee!");
        roll();
    }

}

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线程“main”java.lang.arrayindexoutofboundsexception中出现异常：4错误

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