Question

BowlingTeamDemo2类中的最后一个for循环在第一次迭代中将x增加到4的值。难倒...程序将自动填充名称而不是使用扫描仪，仅用于测试目的。我在最后一个for循环的内循环之前和之后添加了变量x的打印输出，以测试x的值。在内循环之前，值为0，在内循环开始后，值为4。循环正确打印团队名称，但在尝试从getMember()类访问BowlingTeam方法时失败。这是一个例子，而不是练习。

我得到的错误是：

线程中的异常＆＃34; main＆＃34; java.lang.ArrayIndexOutOfBoundsException：4 在BowlingTeam.getMember（BowlingTeam.java:21）at BowlingTeamDemo2.main（BowlingTeamDemo2.java:41）

public class BowlingTeam{

    private String teamName;
    private String[] members = new String[4];

    public void setTeamName(String team){
        teamName = team;
    }
    public String getTeamName(){
        return teamName;
    }

    public void setMember(int number, String name){
        members[number] = name;
    }
    public String getMember(int number){
        // We have an issue here!!!!!!
        return members[number];
    }
}

import java.util.*;
public class BowlingTeamDemo2{

    public static void main(String[] args){
        String name;
        final int NUM_TEAMS = 4;
        final int NUM_TEAM_MEMBERS = 4;
        int x;
        int y;

        BowlingTeam[] teams = new BowlingTeam[NUM_TEAMS];

        Scanner input = new Scanner(System.in);

        for(y = 0; y < NUM_TEAMS; ++y){
            teams[y] = new BowlingTeam();
            System.out.println("Enter team name >> ");
            name = "Teams";
            teams[y].setTeamName(name);

            for(x = 0; x < NUM_TEAM_MEMBERS; ++x){
                System.out.println("Enter team members name >> ");
                name = "CoolName";
                teams[y].setMember(x, name);
            }
        }

        x = 0;
        y = 0;

        for(y = 0; y < NUM_TEAMS; ++y){
            System.out.println(x);

            for(x = 0; x < NUM_TEAM_MEMBERS; ++x);{
                System.out.println(x);
                System.out.println("\nMembers of team " +
                                teams[y].getTeamName());
                // We have an issue here!!!!!!
                System.out.print(teams[y].getMember(x) + " ");
            }
        }

        System.out.println();
    }
}

Answer 1

Suppose your for loop has wrong syntax and it should be like this.

for(y = 0; y < NUM_TEAMS; ++y){
        System.out.println(x);

        for(x = 0; x < NUM_TEAM_MEMBERS; ++x){
            System.out.println(x);
            System.out.println("\nMembers of team " +
                            teams[y].getTeamName());
            // We have an issue here!!!!!!
            System.out.print(teams[y].getMember(x) + " ");
        }
    }

Java变量在for循环开始时增加超出范围

1 个答案: