使用了静态成员 静态方法 很多地方索引超出界限 无法输出

Question

用winform做一个简单的成绩录入 列表
输入人数  按button2  创建数组
再输入姓名 性别 年龄 三次作业成绩 一个期末成绩 
要求列出 所有人的姓名 性别 年龄 总评成绩
  public static void stat()
        {
            try
            {
                j = 0;
                for (i = 0; i < k1-1; i++)
                {
                    cj[i] = new student();
                }
            }
            catch(IndexOutOfRangeException e1)
            {
                k1 = 0;
            }
这里老报超出数组界限
button事件里输入后报错  无法输出
会不会是因为那几个静态的东西？？
麻烦大家帮忙 谢谢using System;
using System.Collections.Generic;
using System.Text;namespace WindowsApplication1
{
    
    public class person
    {
        public string name;
        public char sex;
        public int age;
        public person(string a, char b, int c)
        {
            name = a;
            sex = b;
            age = c;
        }
        public person()
        { 
        }
    }
    public class student:person
    {
        public double a1, a2, a3, b1,c1;
         
         
        public student(double a, double b, double c, double d, string e, char f, int g)
            : base(e, f, g)
        {
            a1 = a;
            a2 = b;
            a3 = c;
            b1 = d;
     
        }
        public student()
            : base()
        {
        }        public double zong()
        {
            c1 = (a1 + a2 + a3) / 3 * 0.3 + b1 * 0.7;
            return c1;
        }
        
    }
    public class sta
    {
        static public int k1,i,j;
        static public student[] cj = new student[k1];
                public static void stat()
        {
            try
            {
                j = 0;
                for (i = 0; i < k1-1; i++)
                {
                    cj[i] = new student();
                }
            }
            catch(IndexOutOfRangeException e1)
            {
                k1 = 0;
            }
                    }
    }
         
}
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                string a;
                char b;
                int c, i1;
                double d, e1, f, g;
                i1 = sta.j;
                if (i1 > sta.k1) { }
                else
                {
                    a = Convert.ToString(textBox2.Text);
                    b = Convert.ToChar(textBox3.Text);
                    c = Convert.ToInt32(textBox4.Text);
                    d = Convert.ToDouble(textBox5.Text);
                    e1 = Convert.ToDouble(textBox6.Text);
                    f = Convert.ToDouble(textBox7.Text);
                    g = Convert.ToDouble(textBox8.Text);
                    sta.cj[i1].name = a;
                    sta.cj[i1].sex = b;
                    sta.cj[i1].age = c;
                    sta.cj[i1].a1 = d;
                    sta.cj[i1].a2 = e1;
                    sta.cj[i1].a3 = f;
                    sta.cj[i1].b1 = g;                    richTextBox1.Text = sta.cj[i1].name + sta.cj[i1].sex + sta.cj[i1].age + sta.cj[i1].c1;
                    sta.j++;
                    
                }
            }
            catch (FormatException e2)
            {
                 
            }
            catch (Exception e3)
            {
                 
            }
 
        }        private void button2_Click(object sender, EventArgs e)
        {
            int a ;
            a = Convert.ToInt32(textBox1.Text);
            sta.k1 = a;
            sta.stat();
           richTextBox1.Text=Convert.ToString(sta.k1);
        }        
        
    }
}

Answer 1

static public int k1,i,j; 
        static public student[] cj = new student[k1]; 
应该是在K1赋值前,cj就已经被静态构造初始化完了,大小已经固定了.

Answer 2

public class sta 
    { 
        static public int k1,i,j; 
        static public student[] cj = new student[k1]; 
        这个地方有点问题吧，因为你声明K1的时候没有赋初值，所以k1为0，你声明student的时候就把这个student数组的长度初始化为零。
所以你后面一引用这个数组的时候，就会出现下标越界的问题了。