Question

所以我暂时没有使用Java，并且正在尝试codingame.com看看我还记得什么。我正在做教程级别，它有以下代码：

import java.util.*;
import java.io.*;
import java.math.*;

/**
* The code below will read all the game information for you.
* On each game turn, information will be available on the standard input, you will be sent:
* -> the total number of visible enemies
* -> for each enemy, its name and distance from you
* The system will wait for you to write an enemy name on the standard output.
* Once you have designated a target:
* -> the cannon will shoot
* -> the enemies will move
* -> new info will be available for you to read on the standard input.
**/
class Player {

public static void main(String args[]) {
    Scanner in = new Scanner(System.in);


    // game loop
    while (true) {
        int count = in.nextInt(); // The number of current enemy ships within range
        String[] enemy = new String[count];
        int[] dist = new int[count];
        String closeEnemy = "";
        for (int i = 0; i < count; i++) {
            enemy[i] = in.next(); // The name of this enemy
            dist[i] = in.nextInt(); // The distance to your cannon of this enemy
        }
        for(int j = 0; j <= count - 1; j++){
            if(dist[j] > dist[j+1] ){
                closeEnemy = enemy[j];
            }
            else{
                closeEnemy = enemy[j+2];
            }
        }

        // Write an action using System.out.println()
        // To debug: System.err.println("Debug messages...");

        System.out.println(closeEnemy); // The name of the most threatening enemy (HotDroid is just one example)
    }
}
}

我需要做的是假设计数是2，我需要通过比较来自不同敌人的dist变量来检查哪个敌人更接近。

我做的是：

import java.util.*;
import java.io.*;
import java.math.*;

/**
* The code below will read all the game information for you.
* On each game turn, information will be available on the standard input, you will be sent:
* -> the total number of visible enemies
* -> for each enemy, its name and distance from you
* The system will wait for you to write an enemy name on the standard output.
* Once you have designated a target:
* -> the cannon will shoot
* -> the enemies will move
* -> new info will be available for you to read on the standard input.
**/
class Player {

public static void main(String args[]) {
    Scanner in = new Scanner(System.in);


    // game loop
    while (true) {
        int count = in.nextInt(); // The number of current enemy ships within range
        String[] enemy = new String[count];
        int[] dist = new int[count];
        String closeEnemy = "";
        for (int i = 0; i < count; i++) {
            enemy[i] = in.next(); // The name of this enemy
            dist[i] = in.nextInt(); // The distance to your cannon of this enemy
        }
        for(int j = 0; j <= count - 1; j++){
            if(dist[j] > dist[j+1] ){
                closeEnemy = enemy[j];
            }
            else{
                closeEnemy = enemy[j+2];
            }
        }

        // Write an action using System.out.println()
        // To debug: System.err.println("Debug messages...");

        System.out.println(closeEnemy); // The name of the most threatening enemy (HotDroid is just one example)
    }
}
}

我试图让它适用于任何数量的敌人（对于用户会插入的任何计数），但是当我测试它时，它会给我以下错误：

Exception in thread "main" java.util.InputMismatchException at Player.main on line 24

我检查了所有内容，但我无法找到错误，并希望得到一些帮助。

Answer 1

当程序期待String时，您可能正在输入double或int。以下输入无需抛出InputMismatchException：

2
enemy1
1
enemy2
2

之后你会得到一些超出界限的数组，可以用以下方法修复：

for(int j = 0; j < count - 1; j++){
    if(dist[j] > dist[j+1] ){
        closeEnemy = enemy[j];
    } else {
        closeEnemy = enemy[j+1];
    }
}

获取java.util.InputMismatchException？

1 个答案: