Java从用户输入创建数组遇问题：playerJersey与playerRating赋值错误

核心错误点 #

• 循环条件完全错误：你前两个赋值循环的终止条件用了i < playerJersey[i]和i < playerRating[i]，但Java里刚创建的int数组所有元素默认是0。当i=0时，0 < 0不成立，循环直接跳过，两个数组根本没被赋值，全程都是默认的0。
• 输入输出逻辑颠倒：第三个循环里，你先打印了数组的默认值，再提示输入，这完全搞反了流程——应该先提示用户输入信息，读取后存入数组，最后再输出展示结果。

修正后的代码 #

import java.util.Scanner;

public class PlayerRoster {
    public static void main(String[] args) {
        Scanner scnr = new Scanner(System.in);
        final int MAX_PLAYERS = 5;
        int[] playerJersey = new int[MAX_PLAYERS];
        int[] playerRating = new int[MAX_PLAYERS];
        
        // 读取用户输入并存入数组
        for (int i = 0; i < MAX_PLAYERS; ++i) {
            System.out.println("Enter player " + (i + 1) + "'s jersey number:");
            playerJersey[i] = scnr.nextInt();
            
            System.out.println("Enter player " + (i + 1) + "'s rating:");
            playerRating[i] = scnr.nextInt();
        }
        
        // 输出所有球员的球衣号与对应评分
        System.out.println("\nPlayer Roster:");
        for (int i = 0; i < MAX_PLAYERS; ++i) {
            System.out.println("Player " + (i + 1) + ": Jersey Number " + playerJersey[i] + ", Rating " + playerRating[i]);
        }
    }
}

内容的提问来源于stack exchange，提问作者Brian Miller