如何修复 ArrayIndexOutOfBoundsException（控制台）

Question

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 7
at com.PenguinGaming.Player.User(Player.java:47)
at com.PenguinGaming.Game.main(Game.java:18)

不知道如何防止 6 后崩溃。我想说那个位置不可去。我试过了

if(input.equals(commands.commandlist()[1])){
            //Go north
            System.out.println(map.MapLayout()[playerX][playerY+1]);
            if(playerY > 6){
                playerY -=1;
                System.out.println("You can not move in that direction");
            }
            playerY += 1;
        }

我只在 GUI 中处理过一次这个问题，那是在观看视频之后，我们是如何做到的，一旦它到达就摧毁了对象。在这种情况下，我不想破坏它，但是，说它不能再继续了。我认为问题出在我的循环中，它添加了一个然后检查所以它超出并崩溃了。为了防止这种情况，我可能需要先检查但不确定如何检查。

Player.java

package com.PenguinGaming;

import java.util.Scanner;

public class Player {

public void User(){

    Commands commands = new Commands();
    Map map = new Map();

    int Maxlife = 25;
    int life = 25;
    int turns = 0;

    //Starting player location
    int playerX = 4;
    int playerY = 4;

    Scanner scanner = new Scanner(System.in);

    String input = null;


    while(life > 1){

        System.out.println("Player life: " + life + "/" + Maxlife);
        input = scanner.nextLine();
        input = input.toLowerCase();

        life -= 1;

        for(int i = 0; i == 30; i++){
            turns++;
            if(turns == 30){
                Maxlife += 5;
            }
        }

        if (input.equals(commands.commandlist()[0])) {
        // give description for player location
        System.out.println(map.MapLayout()[playerX][playerY]);
        }

        if(input.equals(commands.commandlist()[1])){
            //Go north
            System.out.println(map.MapLayout()[playerX][playerY+1]);
            playerY += 1;
        }

        if(input.equals(commands.commandlist()[2])){
            //Go east
            System.out.println(map.MapLayout()[playerX+1][playerY]);
            playerX += 1;
        }

        if(input.equals(commands.commandlist()[3])){
            //Go south
            System.out.println(map.MapLayout()[playerX][playerY-1]);
            playerY -= 1;
        }

        if(input.equals(commands.commandlist()[4])){
            //Go west
            System.out.println(map.MapLayout()[playerX-1][playerY]);
            playerX -= 1;
        }

        if(input.equals(commands.commandlist()[5])){
            //Terminate game
            break;
        }

        if(life <= 0){
            System.out.println("Looks like you have starved, better luck next game");
            break;
        }
        if(playerY > 6|| playerX > 6){
            System.out.println("You can not move in that direction");
        }
    }
    System.exit(0);
}
}

Game.java

package com.PenguinGaming;

import java.util.Scanner;

public class Game{

public static void main(String[] args){

    Player player = new Player();
    Map map = new Map();

    boolean running = true;

    //Print starting location
    System.out.println(map.MapLayout()[4][4]);

    while(running){
    player.User();
    }

}
}

Answer 1

你应该在这行之前检查 playerY

System.out.println(map.MapLayout()[playerX][playerY+1]);

即:

    if(input.equals(commands.commandlist()[1])){
        if(playerY > 6){
            playerY -=1;
            System.out.println("You can not move in that direction");
        } else {
            //Go north
            System.out.println(map.MapLayout()[playerX][playerY+1]);
            playerY += 1;
        }
    }

如何修复 ArrayIndexOutOfBoundsException（控制台）

How to fix ArrayIndexOutOfBoundsException (console)

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Player.java

Game.java